transactions of jwri · 2018. 4. 27. · professor dr. fujii hidetoshi specially appointed...

ISSN 0387-4508

Vol. 46

2017

JOINING AND WELDING RESEARCH INSTITUTE

OSAKA UNIVERSITY

JAPAN

TRANSACTIONS

OF

J W R I

Assistant Professor Dr. KOZAWA Takahiro Specially Appointed Researcher Dr. KONDO Akira

2) Nano/Micro Structure Control Professor Dr. KIRIHARA Soshu

3) Smart Green Processing Associate Professor Dr. NISHIKAWA Hiroshi Specially Appointed Researcher Dr. MOKHTARI Omid Specially Appointed Researcher Dr. ROH Myong-Hoon Specially Appointed Researcher Dr. KIM Minsu Specially Appointed Researcher Dr. KIM Gaeon Guest Researcher Mr. KOHINATA Shigeru

4) Life-Innovation Materials Processing Associate Professor Dr. ABE Hiroya

5. Hitachi Zosen Advanced Welding Technology Joint Research Chair Guest Professor Dr. KITAGAWA Akikazu Guest Professor Dr. KATAYAMA Seiji Professor (Supplementary Assignment) Dr. TANAKA Manabu Professor (Supplementary Assignment) Dr. MINAMI Fumiyoshi Specially Appointed Associate Professor Dr. NAKATANI Mitsuyoshi Guest Associate Professor Dr. HARADA Hiroki Associate Professor (Supplementary Assignment) Dr. KAWAHITO Yousuke Associate Professor (Supplementary Assignment) Dr. SHIGETA Masaya Specially Appointed Assistant Professor Mr. ABE Yohei Guest Researcher Mr. KATSUKI Makoto Guest Researcher Mr. SASAKI Yosuke

6. Osaka Fuji "Advanced Functional Processing" Joint Research Chair Specially Appointed Professor Dr. ABE Nobuyuki Professor (Supplementary Assignment) Dr. TSUKAMOTO Masahiro Specially Appointed Assistant Professor Mr. HAYASHI Yoshihiko Specially Appointed Assistant Professor Mr. AZUMI Kazuyuki Guest Researcher Mr. YONEYAMA Mikio Guest Researcher Mr. TATSUMI Yoshihiro

7. "Advanced Joint Production System" Joint Research Chair Specially Appointed Associate Professor Mr. AMASAKI Tetsuya Guest Researcher Mr. YAMAGUCHI Hiroshi

8. Development Base on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development

Leader, Professor Dr. SETSUHARA Yuichi Specially Appointed Professor Dr. OHARA Satoshi

9. Center to Create Research and Educational Hubs for Innovative Manufacturing in Asia / Division of Global Joining for Extreme Environments

Associate Professor (Supplementary Assignment) Dr. KAWAHITO Yousuke Specially Appointed Associate Professor Ms. KATSUMATA Mihoko Specially Appointed Assistant Professor Ms. TERANISHI Misa Specially Appointed Researcher Mr. HIMI Futoshi

10. Global Collaborative Research Center for Computational Welding Science (CCWS)

Leader, Professor (Supplementary Assignment) Dr. MA Ninshu Guest Professor Dr. MURAKAWA Hidekazu Guest Professor Dr. RASHED Sherif Guest Professor Dr. HIRAOKA Kazuo Guest Professor Dr. MATSUYAMA Kinichi Associate Professor (Supplementary Assignment) Dr. SERIZAWA Hisashi Guest Associate Professor Dr. SHIBAHARA Masakazu

11. International Research Center for Fatigue Design of Weld Structures(FDWS) Leader, Professor (Supplementary Assignment) Dr. MIMAMI Fumiyoshi Guest Professor Dr. TOYOSADA Masahiro Guest Professor Dr. TERADA Kenjiro Associate Professor (Supplementary Assignment) Dr. TSUTSUMI Seiichiro Assistant Professor (Supplementary Assignment) Dr. TAKASHIMA Yasuhito Specially Appointed Assistant Professor Dr. FINCATO Riccardo (Supplementary Assignment)

12. Joint Interface Microstructure Characterization Room Associate Professor Dr. TAKAHASHI Makoto

13. NEDO Future Pioneering Projects Specially Appointed Professor Dr. NAKATA Kazuhiro Specially Appointed Assistant Professor Dr. NAGATSUKA Kimiaki Specially Appointed Researcher Dr. WU Lihui

14. R&D Project for Environmental Resources and ECO Joining Specially Appointed Professor Dr. TAKAHASHI Yasuo Specially Appointed Researcher Dr. HENG Zhonghao

15. Industry Cooperation Office Visiting Professor Mr. TADA Hideaki Visiting Professor Dr. SUGA Tetsuo

Organization and Staff (December 2017)Director Dr. MINAMI Fumiyoshi

1. Research Division of Materials Joining Process 1) Energy Control of Processing Professor Dr. TANAKA Manabu Associate Professor Dr. SHIGETA Masaya Assistant Professor Dr. TASHIRO Shinichi

2) Energy Transfer Dynamics Professor Dr. SETSUHARA Yuichi Specially Appointed Professor Dr. ONO Kouichi Associate Professor Dr. UCHIDA Giichiro Assistant Professor Dr. TAKENAKA Kousuke

3) Manufacturing Process Professor (Supplementary Assignment) Dr. TSUKAMOTO Masahiro

4) Laser Materials Processing Professor Dr. TSUKAMOTO Masahiro Associate Professor Dr. KAWAHITO Yousuke Specially Appointed Associate Professor Dr. SATO Yuji Specially Appointed Researcher Ms. HIGASHINO Ritsuko Specially Appointed Researcher Mr. MASUNO Shinichiro Specially Appointed Researcher Dr. WANG Hongze

5) Advanced Engineering Science Guest Professor Dr. CHIBA Akihiko

2. Research Division of Materials Joining Mechanism 1) Welding Mechanism Professor Dr. ITO Kazuhiro Associate Professor Dr. MIKAMI Yoshiki Associate Professor (Supplementary Assignment) Dr. TAKAHASHI Makoto Assistant Professor Dr. KOHAMA Kazuyuki

2) Joint Interface Structure and Formation Mechanism Professor Dr. FUJII Hidetoshi Specially Appointed Professor Dr. USHIODA Kohsaku Guest Professor Dr. TAKEUCHI Eiichi Associate Professor Dr. NAGIRA Tomoya Specially Appointed Associate Professor Dr. SUN Yufeng Specially Appointed Associate Professor Dr. MORISADA Yoshiaki Assistant Professor Dr. LIU Huihong Specially Appointed Researcher Dr. AOKI Yasuhiro Specially Appointed Researcher Dr. LEE Seung-Joon Specially Appointed Researcher Dr. YOON Sungook Specially Appointed Researcher Dr. CHENG Chun Specially Appointed Researcher Dr. VICHARAPU Buchibabu

3) Composite Materials Processing Professor Dr. KONDOH Katsuyoshi Guest Professor Dr. MA Qian Associate Professor Dr. UMEDA Junko Specially Appointed Associate Professor Dr. SHEN Jianghua Specially Appointed Associate Professor Dr. CHEN Biao Specially Appointed Researcher Mr. MURAKI Yoshinori Specially Appointed Researcher Mr. HORIE Mitsuo Specially Appointed Researcher Ms. FUJII Hiroko Specially Appointed Researcher Mr. MINAMITANI Ryoji Specially Appointed Researcher Mr. KARIYA Shota

3. Division of Materials Joining Assessment 1) Joining Mechanics and Analyses Professor Dr. MA Ninshu Associate Professor Dr. SERIZAWA Hisashi Specially Appointed Researcher Dr. NARASAKI Kunio

2) Structural Integrity and Failure Assessments Professor Dr. MINAMI Fumiyoshi Assistant Professor Dr. TAKASHIMA Yasuhito

3) Joining Design and Dependability Professor (Supplementary Assignment) Dr. MINAMI Fumiyoshi Associate Professor Dr. TSUTSUMI Seiichiro Specially Appointed Assistant Professor Dr. FINCATO Riccardo Specially Appointed Researcher Dr. GADALLAH Ramy Saeed Shafeak

4) Reliability Evaluation & Simulation Professor Dr. INOUE Hiroshige Associate Professor Dr. KADOI Kota Assistant Professor Dr. TOKITA Shun

4. Smart Processing Research Center Director, Professor Dr. SETSUHARA Yuichi

1) Smart Coating Processing Professor Dr. NAITO Makio Guest Professor Dr. KUGIMIYA Koichi

TRANSACTIONS

OF

J W R I

Vol. 46

2017

JOINING AND WELDING RESEARCH INSTITUTE

OSAKA UNIVERSITY

JAPAN

ISSN 0387-4508

Transactions of JWRI, Vol. 46, 2017CONTENTS

RESEARCH ACTIVITIES OF JWRI

Division of Materials Joining Process Dep. of Energy Control of Processing Experimental Investigation on Weld Pool Formation Process in Plasma Keyhole Arc Welding Journal of Physics D: Applied Physics, 51, (2017), 015204(14pp). Nguyen Van Anh, Shinichi Tashiro, Bui Van Hanh, Manabu Tanaka ........................ 1

Dep. of Energy Transfer Dynamics Development of a Non-equilibrium 60 MHz Plasma Jet with a Long Discharge Plume Journal of Applied Physics, 122, (2017), 033301. Giichiro Uchida, Kazufumi Kawabata, Taiki Ito, Kosuke Takenaka, Yuichi Setsuhara ........................ 2

Dep. of Laser Materials Processing Suppression of Dilution in Ni-Cr-Si-B Alloy Cladding Layer by Controlling Diode Laser Beam Profile Optics & Laser Technology, 99, (2017), 326–332. Daichi Tanigawa, Yoshinori Funada, Nobuyuki Abe, Masahiro Tsukamoto, Yoshihiko Hayashi, Hiroyuki Yamazaki, Yoshihiro Tasumi, Mikio Yoneyama ........................ 3 Division of Materials Joining Mechanism Dep. of Welding Mechanism A New Process for Design and Manufacture of Tailor-made Functionally Graded Composites through Friction Stir Additive Manufacturing Journal of Manufacturing Processes, 26, (2017), 122–130. Abhay Sharma, Bandari Vijendra, Kazuhiro Ito, Kazuyuki Kohama, M Ramji, B.V. Himasekhar Sai ........................ 4

Dep. of Joint Interface Structure and Formation Mechanism Clarification of Microstructure Evolution of Aluminum during Friction Stir Welding using Liquid CO2 Rapid Cooling Materials and Design, 129, (2017), 151–163. Xiaochao Liu, Yufeng Sun, Hidetoshi Fujii ........................ 5

Dep. of Composite Materials Processing Length Effect of Carbon Nanotubes on the Strengthening Mechanisms in Metal Matrix Composites Acta Materialia, 140, (2017), 317-325. Biao Chen, Jianghua Shen, Lei Jia, Shufeng Li, Junko Umeda, Makato Takahashi, Katsuyoshi Kondoh ........................ 6

Division of Materials Joining Assessment Dep. of Joining Mechanics and Analyses Measurement of Residual Stress in Arc Welded Lap Joints by cosα X-ray Diffraction Method Journal of Materials Processing Technology, 243, (2017), 387–394. Jian Lina, Ninshu Ma, Yongping Lei, Hidekazu Murakawa ........................ 7

Dep. of Structural Integrity and Failure Assessments Obser v ation of Micro-cracks beneath Fracture Surface during Dynamic Crack Propagation Theoretical and Applied Fracture Mechanics, 92, (2017), 178–184. Yasuhito Takashima, Tomoya Kawabata, Suguru Yamada, Fumiyoshi Minami ........................ 8

Dep. of Joining Design and Dependability Closest-point Projection Method for the Extended Subloading Surface Model Acta Mechanica, 228, (2017), 4213–4233. Riccardo Fincato, Seiichiro Tsutsumi ........................ 9

Dep. of Reliability Evaluation & Simulation Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal Metallurgical and Materials Transactions A, 48, (2017), 5860–5869. Kota Kadoi, Kenji Shinozaki ...................... 10

Smart Processing Research Center Dep. of Smart Coating Processing Effect of BaF2 Powder Addition on the Synthesis of YAG Phosphor by Mechanical Method Advanced Power Technology, 28, (2017), 50–54. Kazuaki Kanai, Yoshifumi Fukui, Takahiro Kozawa, Akira Kondo, Makio Naito ...................... 11

Dep. of Nano/Micro Structure Control Ultraviolet Laser Stereolithography of Alumina Lattice with a Diamond Pattern Ceramic Interconnect and Ceramic Microsystems Technology, 13, 1 (2017), 225–231. Soshu Kirihara ...................... 12

Dep. of Smart Green Processing Thermal Stability of Low-temperature Sintered Joint using Sn-coated Cu Particles during Isothermal Aging at 250 °C J. Mater. Sci. Electron, 28, (2017), 12606–12616. Xiangdong Liu, Shiqi Ahou, Hiroshi Nishikawa ...................... 13

Dep. of Life-Innovation Materials Processing Spherical Porous Granules in MgO-Fe2O3-Nb2O5 System: In situ Observation of Formation Behavior using High-temperature Confocal Laser-scanning Microscopy Journal of the European Ceramic Society, 37, (2017), 5339–5345. Yoshikazu Suzuki, Hiroya Abe, Hajime Yamamoto, Kazuhiro Ito, Hiroshige Inoue, Mayumi Nakamura ...................... 14

Hitachi Zosen Advanced Welding Technology Joint Research Chair Development of Bead Shape Measurement Technology for Pipe Welds 溶接構造シンポジウム 2017講演論文集，(2017), 189–192. Yohei Abe, Mitsuyoshi Nakatani, Masahiko Adachi, Kazuhiko Tani, Hisato Yuto ...................... 15

Development Base on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development Effects of NiO-loading on n-type GaN Photoanode for Photoelectrochemical Water Splitting using Different Aqueous Electrolyte International Journal of Hydrogen Energy, 42, (2017), 9493-9499. Kayo Koike, Kazuhiro Yamamoto, Satoshi Ohara, Tomoka Kiritsu, Kazunari Ozasa, Shinichiro Nakamura, Masakazu Sugiyama, Yoshiaki Nakano, Katsushi Fujii ...................... 16

Center to Create Research and Educational Hubs for Innovative Manufacturing in Asia Division of Global Joining for Extreme Environments Activity Report on “The Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia” Mihoko Katsumata, Futoshi Himi, Yosuke Kawahito ...................... 17

NEDO Future Pioneering Projects Resistance Spot Welding of Metal/carbon-fiber-reinforced Plastics and Applying Silane Coupling Treatment Science and Technology of Welding and Joining, (2017), 1–6. Kimiaki Nagatsuka, Bolyu Xiao, Lihui Wu, Kazuhiro Nakata, Shuhei Saeki, Yamato Kitamoto, Yoshiaki Iwamoto ...................... 18

R&D Project for Environmental Resources and ECO Joining Solid-state Microjoining Mechanisms of Wire Bonding and Flip Chip Bonding The ASME Journal of Electronic Packaging, 139, 4 (2017) 041010-1-13. Yasuo Takahashi, Hiroki Fukuda, Yasuhiro Yoneshima, Hideki Kitamura, Masakatsu Maeda ...................... 19

JWRI Cooperative Research Program, Joint Use / Research Award Study on Control of Cathode Spot Behavior in Arc Welding Quarterly J. Japan Welding Soc., 35, 2 (2017), 47s-50s. Toshifumi Yuji, Atsuhi Fujimaru, Kentaro Yasui, Hiroyuki Kinoshita, Toshio Bouno, Shinichi Tashiro, Manabu Tanaka ...................... 20

Surface Morphology of Ti-6Al-4V Plate Fabricated by Vacuum Selective Laser Melting Applied Physics B-Lasers and Optics, 119, (2015), 545-549. S. Sato, M. Tsukamoto, Y. Yamashita ...................... 21

Dissimilar spot welding of three lapped sheets of aluminum alloy and steels by metal flow -Application of Friction Anchor Welding to three lapped sheets of aluminum alloy and steels- Journal of light metal welding, 52, (2014), 453-462. Masaru Sakamura, Kaoru Ohishi, Kouhei Ota, Yoshihiro Takeyasu, Shigeyuki Mizunari, Hidetoshi Fujii ...................... 22

Anisotropic Damage Constitutive Law for Cleavage Failure in Crystalline Grain by Cohesive Zone Model Quarterly J. Japan Welding Soc., 35, 2 (2017), 165s-168s. Yuichi Shintaku, Kenjiro Terada, Seiichiro Tsutsumi ...................... 23

COBTRIBUTIONS TO OTHER ORGANIZATIONS......................................................................................24

1

Research Division of Materials Joining Process, Dep. of Energy Control of Processing Journal of Physics D: Applied Physics, 51, (2017), 015204 (14pp). doi:10.1088/1361-6463/aa9902

Experimental Investigation on Weld Pool Formation Process in Plasma Keyhole Arc Welding Nguyen Van Anh*, Shinichi Tashiro**, Bui Van Hanh***, Manabu Tanaka****

Abstract (159Words) This paper seeks to clarify weld pool formation process in PKAW. We adopted, for the first time, measurement of three-dimensional convection inside the weld pool in PKAW using X-ray transmission systems. Two-dimensional convection on weld pool surface was also measured using zirconia tracer particles. To discuss heat transport process in the weld pool, two-dimensional temperature distribution on the weld pool surface was also measured by the two-color pyrometry. The results indicate that the shear force due to plasma flow is found to be the dominant driving force in weld pool formation process in PKAW. Thus, the heat transport in the weld pool is considered to be governed by two large convective patterns near keyhole. They are formed with equal velocity of approximately 0.35 m/s and are mainly driven by shear force. Furthermore, the flow velocity of weld pool convection becomes considerably higher than that of other welding process such as GTAW and GMAW due to larger plasma flow velocity. Keywords Plasma keyhole arc welding; Weld pool formation process; X-ray observation; Flow velocity measurement; Temperature measurement

(a) perspective view (b) top view

* Graduate School Student ** Assistant Professor

*** Hanoi University of Science and Technology **** Professor

Fig.1. Three-dimensional convective patterns inside weld pool.

2

Research Division of Materials Joining Process, Dep. of Energy Transfer Dynamics Journal of Applied Physics, 122 (2017) 033301 doi: 10.1063/1.4993715

Development of a Non-equilibrium 60 MHz Plasma Jet with a Long Discharge Plume Giichiro Uchida*, Kazufumi Kawabata**, Taiki Ito**, Kosuke Takenaka***, Yuichi Setsuhara****

Abstract(182words) High-frequency plasma jets driven by voltages in the frequency range 6–60 MHz are developed. A long plasma jet 40 mm in length is successfully produced by using a pair of ring electrodes outside a quartz tube. The electrode pair consists of a wide power electrode and a narrow ground electrode that is positioned at the head of the tube. The ratio of the length of the ground electrode to the length of the power electrode must be small in order to produce the long plasma jets. The high-frequency plasma jet is operated in a non-thermal-equilibrium state at a gas temperature of around 60 °C. Operation at the very-high-frequency of 60 MHz leads to a lower discharge voltage and lower electron energy compared with the lower frequencies of 6 and 13.56 MHz. The ability of the very-high-frequency 60 MHz plasma jet to produce reactive oxygen and nitrogen species in water is also investigated. High H2O2 and NO3− concentrations of more than 1 mmol/l are realized by irradiating 3 ml of deionized water with the plasma for the short period of 2 min. Keywords Nonthermal plasma jet; High density plasma source; Reactive oxygen and nitrogen species

* Associate Professor ** Graduate School Student

*** Assistant Professor **** Professor

0

20

40

60

80

100

0 1 2 3 4 5 6

6 MHz13.56 MHz60 MHz

Plas

ma

jet l

engt

h (m

m)

Voltage (kV)

1.4 kV

4.75 kV

10 mm

60 MHz

13.56 MHz

6 MHz

2.75 kV

1

10

100

1000

104

1 1.2 1.4 1.6 1.8 2

H2O

2

NO2

-

NO3

-

Con

cent

ratio

n (

mol

/l)

Voltage (kV)

(a)

(b)

1.57 kV 1.93 kV

10 mm 10 mm

Notcontact

DirectcontactWater

surfaceWatersurface

Fig.1 Dependence of the plasma-jet length on the applied peak-to-peak voltage for driving-voltage frequencies of 6, 13.56, and 60 MHz. The Ar gas flow rate was 3 slm. The photographs show high-frequency plasma jets 40 mm in length for driving-voltage frequencies of 6, 13.56, and 60 MHz. Reproduced from Journal of Applied Physics, 122, 033301 (2017), with the permission of AIP Publishing.

Fig.2 (a) Photographs deionized water being irradiated by the VHF plasma jet (60 MHz). (b) Dependence of H2O2, NO2−, and NO3− concentrations in the plasma-irradiated water on the applied peak-to-peak voltage. The 60 MHz plasma jet was used to irradiate 3 ml of deionized water for 2 min. Reproduced from Journal of Applied Physics, 122, 033301 (2017), with the permission of AIP Publishing.

3

Research Division of Materials Joining Process, Dep. of Laser Materials Processing Optics & Laser Technology,99,(2017),326-332 https://doi.org/10.1016/j.optlastec.2017.09.019

Suppression of Dilution in Ni-Cr-Si-B Alloy Cladding Layer by Controlling Diode Laser Beam Profile Daichi Tanigawa*, Yoshinori Funada**, Nobuyuki Abe***, Masahiro Tsukamoto****, Yoshihiko Hayashi*****, Hiroyuki Yamazaki******, Yoshihiro Tasumi*******, Mikio Yoneyama*******

Abstract (148 Words) A Ni-Cr-Si-B alloy layer was produced on a type 304 stainless steel plate by laser cladding. In

order to produce cladding layer with smooth surface and low dilution, influence of laser beam profile on cladding layer was investigated. A laser beam with a constant spatial intensity at the focus spot was used to suppress droplet formation during the cladding layer formation. This line spot, formed with a focussing unit designed by our group, suppressed droplet generation. The layer formed using this line spot with a constant spatial intensity had a much smoother surface compared to a layer formed using a line spot with a Gaussian-like beam. In addition, the dilution of the former layer was much smaller. These results indicated that a line spot with a constant spatial intensity was more effective in producing a cladding layer with smooth surface and low dilution because it suppressed droplet generation. Keywords Laser cladding, Flat-top profile, Diode laser, Surface roughness, Dilution

* Graduate School Student

** Industrial Research Institute of Ishikawa *** Specially Appointed Professor

**** Professor ***** Specially Appointed Assistant Professor

****** Specially Appointed Associate Professor ******* Osaka Fuji Corporation

Fig.. Optical images of the cladding layer surfaces formed with (a) a Gaussian-like beam and (b) a

flat-top beam. Cross-sections of the cladding layers in (a) and (b) are shown in (c) and (d), respectively

4

Research Division of Materials Joining Mechanism, Dep. of Welding Mechanism Journal of Manufacturing Processes, 26, (2017), 122–130. doi:10.1016/j.jmapro.2017.02.007 A New Process for Design and Manufacture of Tailor-made Functionally Graded Composites through Friction Stir Additive Manufacturing Abhay Sharma*, Bandari Vijendra*, Kazuhiro Ito**, Kazuyuki Kohama***, M. Ramji*, B.V. Himasekhar Sai*

Abstract (195Words) Motivated by the recent use of friction stirring in the manufacture of in-situ composites, a new additive manufacturing method for the design and manufacture of tailor-made functionally graded composites is presented. The existing literature on the subject matter is limited to creating functional grades in the vicinity of the weld nugget without direct control on composition and property gradients. A mathematical model is developed for achieving a compositional gradient over a predefined length in a metal matrix composite and subsequently demonstrated through the manufacture of aluminum+TiC functionally graded composite. Progressive gradients are observed in hardness and local mechanical properties, namely, Young’s modulus, strain hardening exponent, and yield stress obtained using the digital image correlation technique. The process mechanism is elucidated by correlating results of mechanical tests and electron backscatter diffraction analysis. A specific process condition vis-à-vis the number of passes, volume fraction, and particle size combination may promote one or more phenomena such as continuous dynamic recrystallization, particle fragmentation, and breaking of initial matrix grains, which eventually affect particle mixing and matrix grain size and thus cause property gradients. The findings are expected to enable the manufacture of functionally graded composites products of larger size. Keywords Functionally graded composite; Friction stirring; Additive manufacturing; Mechanical properties; Microstructural analysis; Digital image correlation * Indian Institute of Technology Hyderabad ** Professor *** Assistant Professor

Fig. 1. Inverse pole figures and grain boundary misorientation maps.

5

Research Division of Materials Joining Mechanism, Dep. of Joint Interface Structure and Formation Mechanism Materials and Design, 129, (2017), 151–163. http://dx.doi.org/10.1016/j.matdes.2017.05.013

Clarification of Microstructure Evolution of Aluminum during Friction Stir Welding using Liquid CO2 Rapid Cooling Xiaochao Liu*, Yufeng Sun**, Hidetoshi Fujii***

Abstract The microstructure evolution of aluminum during friction stir welding was reconstructed using tool

“stop action” technique. Simultaneous liquid CO2 was used to “freeze” the weld microstructure and

the transient microstructure after “stop action”. Subsequent short-time annealing produced a

situation similar to the normal cooling. The microstructure evolution during the deformation and

annealing stages was investigated along the material flow and in the “frozen” weld zone,

respectively, by high-resolution electron-backscatter-diffraction technique. The results showed that

the base material evolved into microstructures containing large amount of low angle grain

boundaries (44.8%) with strong (7.9 times) / shear texture at the initial welding stage. With the

increasing of welding strain, lamellar grain structure with strong (6.1 times) / shear texture was developed. Next, continuous dynamic recrystallization via lattice rotation with the grain <101>

orientation as the rotation axis occurred under the strain relaxation condition, leading to lamellar

grains conversion into equiaxed grains. Meanwhile, the strong / texture transformed into weak

(2.9 times) β-fiber textures (dominated by / and components). At the cooling stage, preferred

grain growth along {112}<110> occurred, forming relatively strong (3.8 times) / texture. Keywords Friction stir welding; Rapid cooling; Annealing; Microstructure evolution; Grain structure; Texture

* Graduate school student ** Specially appointed associate professor *** Professor

Fig. 1. Grain structure development from LS to TS: (a–c) are the inverse pole figure maps; (d) the

misorientation angle distributions and average grain size of a, b and c; (e) misorientation distributions

measured along the grain elongation directions; (f–h) are the inverse pole figures of the grains in a, b

and c for their respective shear directions.

6

Research Division of Materials Joining Mechanism, Dep. of Composites Materials Processing Acta Materialia 140 (2017), 317-325. doi.org/10.1016/j.actamat.2017.08.048

Length Effect of Carbon Nanotubes on the Strengthening Mechanisms in Metal Matrix Composites Biao Chen*, Jianghua Shen*, Lei Jia**, Shufeng Li**, Junko Umeda***, Makoto Takahashi****, Katsuyoshi Kondoh*****

Abstract (145 Words) In the present work, we studied the effect of the aspect ratio of carbon nanotubes (CNTs) on strengthening aluminum metal matrix composites (Al MMCs). To this end, Al samples reinforced with CNTs of various aspect ratios were produced via three different powder metallurgy methods. Microstructural examination revealed that the CNTs were uniformly dispersed in the materials with a range of aspect ratios from 6.5 to 55. The tensile results showed that the CNTs exhibited a strong strengthening effect in the composites regardless of their aspect ratios. However, the post-loading examination and quantitative analysis indicated that there was a strengthening mechanism transition for CNTs, which was closely associated with the aspect ratio or length of CNTs. The origin of such transition was explored from the viewpoint of dislocation-CNTs interaction under loading. The findings may provide a new insight in understanding the strengthening behaviors of CNT-reinforced MMCs. Keywords Metal matrix composite; Carbon nanotubes; Strengthening Mechanism; Load transfer; Length effect; Orowan mechanism

* Specially Appointed Researcher ** Professor, Xi'an University of Technology

*** Associate Professor **** Lecture

***** Professor

Fig. 1 Length changes of un-bundled CNTs on Al powder surface by mechanical milling and

dependence of strength contribution by CNTs on aspect ratio or length of CNTs dispersed in Al

matrix composites fabricated by powder metallurgy route.

7

Research Division of Materials Joining Process, Dep. of Joining Mechanics and Analyses Journal of Materials Processing Technology, 243 (2017) 387–394. doi:10.1016/j.jmatprotec.2016.12.021 Measurement of Residual Stress in Arc Welded Lap Joints by cos X-ray Diffraction Method Jian Lina*, Ninshu Ma**, Yongping Lei*, Hidekazu Murakawa**

Abstract (144Words) The welding residual stress of lap joints of thin steel sheets was measured by the cos X-ray diffraction method and compared with the numerical simulation. The longitudinal residual stress in the region near the weld is close to the yield strength of the base metal. The welding residual stress distribution is asymmetrical on the two plates and two sides of the weld because of the asymmetrical geometry of the lap joint. A higher residual stress was observed on the lower plate of lap joints. The longitudinal residual stress has almost the uniform distribution along the weld line except near two ends. The influencing length near two ends of the weld line is about 20–30 mm. The maximum tensile value of the longitudinal residual stress of the lap joint of the high strength steel TS590 is higher than that of the mild steel TS270. Keywords:Residual stress, X-ray diffraction measurement method, Lap joints, Arc welding,

Numerical simulation * Beijing University of Technology ** Professor, Osaka University

Fig. 1. Finite element model of arc welded lap joint.

Fig. 2. Comparison of the computed and measured welding residual stress.

8

Research Division of Materials Joining Assessment, Dep. of Structural Integrity and Failure Assessment Theoretical and Applied Fracture Mechanics, 92, (2017), 178–184. doi:10.1016/j.tafmec.2017.07.013 Observation of Micro-cracks beneath Fracture Surface during Dynamic Crack Propagation Yasuhito Takashima*, Tomoya Kawabata**, Suguru Yamada***, Fumiyoshi Minami****

Abstract (200Words) In this study, micro-cracks generated during dynamic crack propagation were investigated for an ESSO specimen and V-notched Charpy specimen. The ESSO test with temperature gradient and the Charpy impact test were conducted for steel for shipbuilding. The macroscopic roughness of the fracture surface increases with increasing temperature. The section beneath the fracture surface generated during dynamic brittle crack propagation was observed using a scanning electron microscope, after cutting with a focused ion beam or grinding. Many micro-cracks can be found beneath the brittle fracture surface in the V-notched Charpy specimen. In the ESSO specimen, which had a macroscopic flat surface, micro-cracks can be detected beneath the main crack propagated in the temperature range from –140°C to –100°C. On the other hand, there were a few micro-cracks beneath the main crack propagated at relatively high temperature, at which the fracture surface was macroscopically rough. The number of micro-cracks in the Charpy specimen is fewer than those in the ESSO specimen at the same temperature. The observations indicated that the correlations of Charpy impact properties with crack arrest performance for the ESSO specimen was inconvincible in terms of the differences in the micro-scale fracture behavior as well as lack of theoretical basis. Keywords Notched specimen; Brittle fracture; Rapid crack propagation; Cleavage micro-crack; Structural steel * Assistant Professor ** University of Tokyo *** Graduate School Student **** Professor

Fig. 1. Micro-cracks observed beneath the fracture surface in Charpy and ESSO specimens.

Fig. 2. Temperature dependence of number of micro-cracks beneath the fracture surface generated during dynamic brittle crack propagation.

9

Research Division of Materials Joining Assessment, Dep. of Joining Design and Dependability Acta Mechanica , 228, (2017), 4213–4233. doi: 10.1007/s00707-017-1926-0 Closest-point Projection Method for the Extended Subloading Surface Model Riccardo Fincato*, Seiichiro Tsutsumi**

Abstract (111Words) This paper presents the implementation of a fully implicit integration scheme (i.e. closest-point projection method) of an unconventional plasticity model, the Extended Subloading Surface Model. The aim is to obtain precise solutions for elastoplastic investigations of metals subjected to cyclic loading, even for large prescribed loading conditions. A previous incomplete implicit integration scheme (i.e. cutting-plane method) for the model was already formulated. However, this study offers an alternative form, which increase the accuracy of the similarity center variable. The numerical Finite Element Analyses (FEA) show local and global quadratic convergence rates,proving the correct implementation of the integration scheme. Moreover, iso-error maps were computed to show the accuracy of the algorithm. Keywords Fatigue; Numerical techniques; Return mapping; Extended Subloading Surface; Cyclic plasticity.

* Specially Appointed Assistant Professor ** Associate Professor

Fig. 1.Axial stress vs axial strain and relative errors per cycle for a cubic element under uniaxial cyclic loading.

Fig. 2.Iso-error map for the stress, purely biaxial initial condition.

10

Research Division of Materials Joining Assessment, Dep. of Reliability Evaluation &Simulation Metallurgical and Materials Transactions A, 48, (2017), 5860-5869 doi: 10.1007/s11661-017-4340-2 Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal Kota Kadoi*, Kenji Shinozaki **

Abstract (146Words) The influence of the chemical composition, especially the niobium content, chromium equivalent Creq, and nickel equivalent Nieq, on the weld solidification cracking susceptibility in the austenite single-phase region in the Schaeffler diagram was investigated. The distributions of the susceptibility (crack length and BTR) in the diagram revealed a region with high susceptibility to solidification cracking. Addition of niobium enhanced the susceptibility and changed the distribution of the susceptibility in the diagram. The BTR distribution was in good agreement with the distribution of solidification temperature range ( T) calculated by solidification simulation. T increased with increasing content of alloying elements such as niobium. The distribution of T was dependent on the type of alloying element owing to the change of the partitioning behavior. The distribution of the susceptibility in the region is controlled by the change in T and the segregation behavior of niobium with the chemical composition. Keywords Solidification cracking susceptibility, Austenitic metal, Dissimilar weld metal, Dilution ratio, Schaeffler diagram, Stainless steel

* Associate Professor ** Hiroshima University

Fig. Distributions of BTR and T in Schaeffler diagram. a) BTR. b) T.

11

Smart Processing Research Center, Dep. of Smart Coating Processing Advanced Powder Technology, 28 (2017) 50-54. 10.1016/j.apt.2016.07.017

Effect of BaF2 Powder Addition on the Synthesis of YAG Phosphor by Mechanical Method Kazuaki Kanai*, Yoshifumi Fukui*, Takahiro Kozawa**, Akira Kondo***, Makio Naito****

Abstract (93 Words) Here, we report on the effect of BaF2 powder addition on the mechanical synthesis of Ce3+-doped Y3Al5O12 (Y2.97Al5O12:Ce0.033+, YAG:Ce3+) phosphors for white light emitting diodes. The YAG phosphors were synthesized by the mechanical method using an attrition-type mill. When BaF2 was added at 6 wt% to the raw powder materials and milled, the synthesis of YAG:Ce3+ was favorably achieved at the vessel temperature of 255 °C, which was about 1200 °C lower than the YAG phosphor synthesis temperature by solid-state reaction. The synthesized YAG:Ce3+ phosphor revealed the maximum internal quantum yield of 57%. Keywords YAG:Ce3+; Phosphor; White light emitting diode; Attrition-type mill; Mechanical synthesis; BaF2

* Kaneka Corporation ** Assistant Professor *** Specially Appointed Researcher **** Professor

Fig.2. Excitation and emission spectra of YAG phosphor of sample B.

Fig.1. SEM image of sample B.

12

Smart Processing Research Center, Dep. of Nano/Micro Structure Control Ceramic Interconnect and Ceramic Microsystems Technology, 13, 1, (2017), 225-231 Ultraviolet Laser Stereolithography of Alumina Lattice with a Diamond Pattern Soshu Kirihara*

Abstract (141Words) In additive manufacturing of ultraviolet lithography, 2D cross sections were created through dewaxing and sintering by high power laser drawing on spread resin paste including ceramic nanoparticles, and 3D composite models were sterically printed by layer lamination and micro joining. The lithographic system has been developed to obtain bulky ceramic components with functional geometries. As the row material of the lithography, nanometer sized ceramic particles were dispersed in to liquid resins at 50 % in volume fraction. The resin paste was spread on a glass substrate at 100 μm in layer thickness by a mechanically moved knife edge. The ultraviolet laser beam of 355 nm in wavelength was adjusted at 50 μm in diameter and scanned on the pasted resin surface. The irradiation power was changed automatically from 1 to 10 W for enough dewaxing and sintering depth for layer bonding. Keywords Additive manufacturing; Ceramics; Stereolithography

Fig. An alumina micro lattice with a diamond type periodic pattern fabricated by using ultraviolet stereo -lithography. The ceramic component was formed from resin paste including nanoparticles through dewaxed and sintered by ultraviolet laser beam scanning. * Professor

13

Smart Processing Research Center, Dep. of Smart Green Processing J Mater Sci: Mater Electron, 28 (2017), 12606-12616. https://doi.org/10.1007/s10854-017-7085-1

Thermal Stability of Low-temperature Sintered Joint using Sn-coated Cu Particles during Isothermal Aging at 250 °C Xiangdong Liu*, Shiqi Zhou*, Hiroshi Nishikawa**

Abstract (125Words) We investigate the microstructural stability of a Cu–Cu joint sintered with microscale Cu particles

and Sn-coated Cu (Cu@Sn) particles during an isothermal aging. Using Cu particles and Cu@Sn particles as die attach materials, pure Cu discs were bonded at 200 °C for 20 min with an applied pressure of 10 MPa in a formic acid atmosphere. Then, the isothermal aging test was conducted at 250 °C in an air atmosphere. The Cu@Sn sintered joints showed much better thermal stability than the Cu sintered joint. The joint presented nearly 20 MPa shear strength after the aging for 1000 h. The Cu3Sn IMC network suppressed the oxidation of Cu both in the sintered layer and on the substrate, thereby maintaining the microstructural integrity of the Cu@Sn sintered joint. Keywords Pb-free high temperature bonding, Sn-coated Cu particle, Thermal stability, Shear strength

* Graduate School Student ** Associate Professor

Fig. 2 Variation of the shear strength of the Cu@Sn joints and the Cu joints during the isothermal aging test at 250 °C.

Fig. 1 Typical SEM images of the microscale particles used in this study: a Cu particles, b Sn-coated Cu particles, and c cross section of a Sn-coated Cu particle.

14

Smart Processing Research Center, Dep. of Life-Innovation Materials Processing Journal of the European Ceramic Society, 37, (2017) 5339-5345. doi.org/10.1016/j.jeurceramsoc.2017.05.056 Spherical Porous Granules in MgO-Fe2O3-Nb2O5 System: In situ Observation of Formation Behavior using High-temperature Confocal Laser-scanning Microscopy Yoshikazu Suzuki*, Hiroya Abe****, Hajime Yamamoto***, Kazuhiro Ito*****, Hiroshige Inoue*****, Mayumi Nakamura**

Abstract (109Words) The pyrolytic reactive granulation process, yielding ceramic spherical porous granules, is simple, consisting of typical ceramic processing methods, viz., wet-ball milling of powders, vacuum drying, granulation via sieving through a screen mesh, and one-step heat treatment for local reactive sintering within each granule. Here, the microstructural development of spherical porous granules was successfully visualized by in situ high-temperature confocal laser-scanning microscopy during the heating up to 1400 °C in air. Based on the result of the in situ observation, a simple but powerful size-controlling process of spherical porous granules, viz., multiscreen sieving after the heating was demonstrated. Nearly monodispersed spherical porous granules composed of pseudobrookite-type MgFeNbO5 were easily obtained. Keywords Spherical porous granule (SPG) In situ observation; Confocal laser-scanning microscopy (CLSM);

Pseudobrookite; MgFeNbO5 Reprinted from Y. Suzuki et al., Journal of the European Ceramic Society 37 (2017) pp.5339, Copyright (2017), with permission from Elsevier.

* University of Tsukuba ** Yonekura MFG Co.

*** Graduate School Student **** Associate Professor

***** Professor

Fig.1 Microstructure development of sphere porous granules observed by in situ high-temperature confocal laser-scanning microscopy (left). Schematic illustration of the microstructure development during the heating (right).

15

Hitachi Zosen Advanced Welding Technology Joint Research Chair

2017 , (2017), 189-192 Development of Bead Shape Measurement Technology for Pipe Welds

Yohei ABE*, Mitsuyoshi NAKATANI **, Masahiko ADACHI ***, Kazuhiko TANI ***, Hisato YUTO***

Abstract (103 Words) The strength of pipe welds is assured by the throat thickness. The required throat thickness varies according to the angle between pipes, which varies at different positions. It is difficult to measure the throat thickness of the pipe welds by visual testing or using a weld gauge. We have developed the bead shape measurement equipment for pipe welds. The equipment collects two-dimensional point data on the bead shape of a weld using an optical cutting method, determines the leg length and throat thickness by data processing and makes a pass/fail judgment against the required values at the measuring point. Keywords Inspection technique/ Bead shape measurement/ Optical cutting method/ Pipe welds * Specially Appointed Assistant Professor ** Specially Appointed Associate Professor *** Hitachi Zosen Corporation

Fig.2 Measurement result screen.

Fig.1 Groove shape of pipe welds.

Judgment result“Failed” results are indicated in yellow.

Main pipe

Branch pipe

ToeHeel

Saddle

Fillet segment Transition segment Groove segment

ψ 30

e Inside t

ψ 35

45 55tside

60 ψ

90

Outside Insid

16

Special Budget Project of the Ministry of Education, Culture, Sports, Science and Technology, Development Base on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development International Journal of Hydrogen Energy, 42, (2017), 9493-9499. Doi: 10.1149/2.1191613jes Effects of NiO-loading on n-type GaN Photoanode for Photoelectrochemical Water Splitting using Different Aqueous Electrolyte Kayo Koike*, Kazuhiro Yamamoto**, Satoshi Ohara***, Tomoka Kiritsu****, Kazunari Ozasa****, Shinichiro Nakamura****, Masakazu Sugiyama*, Yoshiaki Nakano*, Katsushi Fujii*

Abstract (165Words) n-type GaN photoanodes used for water splitting have stability problems. One means of resolving this is loading NiO catalyst on the n-type GaN surface. Aqueous electrolytes H2SO4, HCl, KOH, and NaOH are usually used for photoelectrochemical water splitting. However, suitable electrolytes for the NiO-loading on n-type GaN photoelectrode have not yet been evaluated. Therefore, we investigated the effects of changing electrolytes used for NiO-loading in this study. The photocurrent of NiO-loading on n-type GaN increased when KOH and NaOH electrolytes were used. In addition, the surfaces showed no corrosion after reaction when these electrolytes were used. However, the photocurrent was not stable using KOH electrolyte. Interestingly, stable photocurrent was observed with when the NaOH electrolyte was used. In the case of H2SO4, the photocurrent of GaN did not change with and without NiO. The surface morphologies became rough because of GaN corrosion, and NiO dissolved in the H2SO4 electrolyte. Keywords GaN; Photoanode; Water splitting; Anodic corrosion; NiO

* The University of Tokyo ** NIMS

*** Specially Appointed Professor **** RIKEN

Fig. 1. NiO precursor nanoparticles synthesized at Joining and Welding Research Institute, Osaka University.

Fig. 2. The time variation of the photocurrent density with and without NiO using 0.5M H2SO4 and 1.0M NaOH electrolytes.

17

The Project to Create Research and Educational Hubs for Innovative manufacturing in Asia Activity Report on “The Project to Create Research and Educational Hubs for Innovative Manufacturing in Asia” Mihoko KATSUMATA*, Futoshi HIMI **, Yosuke KAWAHITO ***

Abstract (206Words) In this project, the three pillars were set; 1) Establish a global network of researchers in joining technologies across Greater Asia Region, 2) Develop new key technologies for joining adaptable to extreme environments, 3) Implement oversea internships which tie up students from area of science and the humanities, named as Coupling internships (CIS). Results of this year’s activities were reported as below. 1) Total of 8 international joint researches including 2 newly commenced and 6 continuous

researches from previous years were implemented. 2 workshops with National Taiwan University, Thailand National Metal and Material Technology Center, and one International Symposium with the invited domestic and oversea speakers were organized. Through the Joint Researches shown in Table 1, 34 international joint papers were posted.

2) Research on Underwater Laser Welding Technology was in the final stage to examine its quality of underwater welding process as well as underwater cutting with invented torch and robot.

3) Coupling Internship was conducted in 5 countries; Indonesia, Vietnam, Thailand, India, and Singapore. Pictures from CIS can be found in Fig. 1 and Fig. 2.

4) Based on the networks, JWRI received 17 students in total from partner universities in Taiwan, Thailand, India, Vietnam, Malaysia, Myanmar and Indonesia under JST Sakura Science Plan.

Table 1 List of International Joint Research in 2017

Partner University Research Topics

King Mongkut’s University of Technology, Thonburi (Thailand) Advanced high-strength titanium powder metallurgy materials for medical devices

Indian Institute of Technology, Hyderabad (India) Relationship between structure and cooling rate of three-dimensional modeling

using arc welding

National Metal and Materials Technology Center (Thailand) Stereolithographic additive manufacturing of biomaterials implants

Indian Institute of Technology, Hyderabad (India) Relationship between mechanical properties and microstructure of welds in Twin-

wire GMAW welding of low carbon steel

Nanyang Technological University (Singapore) Residual stress modeling and fatigue life prediction in laser cladding specimen

Indian Institute of Technology, Hyderabad (India) Research on the melting phenomenon in waveform-controlled SAW

National Metal and Materials Technology Center (Thailand) Laser welding of titanium and CFRP

National Metal and Materials Technology Center (Thailand) Strengthening effect of 316L stainless steel composite via Selective Laser

Melting

* Specially Appointed Associate Professor ** Specially Appointed Researcher

*** Associate Professor

Fig. 1 CIS Singapore Fig. 2 CIS India

18

NEDO Future Pioneering Projects Science and Technology of Welding and Joining, (2017) 1-6. Resistance Spot Welding of Metal/carbon-fiber-reinforced Plastics and Applying Silane Coupling Treatment

Kimiaki NAGATSUKA*, Bolyu XIAO**, Lihui WU**, Kazuhiro NAKATA***, Shuhei SAEKI****,

Yamato KITAMOTO**** and Yoshiaki IWAMOTO****

Abstract

Dissimilar materials joining of SUS304 and carbon-fiber-reinforced plastics consisting of short fibers

and thermoplastics was performed. The materials were joined by series resistance spot welding. The

electrodes were pressed on the metal plate of the lap joint of metal/carbon-fiber-reinforced plastics.

The SUS304 plate was heated by resistance heating, causing the thermoplastic near the interface to

melt slightly because of heat conduction. SUS304 could be joined directly to carbon-fiber-reinforced

polyamide and modified polypropylene, but not to polyphenylene sulphide. The joining area increased

with an increase in the welding current and welding time, so did the tensile shear fracture load.

Furthermore, the silane coupling agent treatment of SUS304 was highly effective in increasing the

joining strength.

KEYWORDS: Series resistance spot welding/ carbon-fiber-reinforced thermoplastic/ polyamide 6/

polypropylene/ polyphenylene sulphide/ stainless steel/ dissimilar materials joining/ silane coupling

________________________________________________________________________________ * Specially Appointed Assistant Professor ** Specially Appointed Researcher *** Specially Appointed Professor **** DENGENSHA TOA CO., LTD

19

Dept. of R & D Project for Environmental Resources and ECO Joining The ASME Journal of Electronic Packaging, 139, 4 (2017) 041010–1-13 doi: 10.1115/1.4038143 Solid-state Microjoining Mechanisms of Wire Bonding and Flip Chip Bonding Yasuo TAKAHASHI*, Hiroki FUKUDA**, Yasuhiro YONESHIMA**, Hideki KITAMURA, Masakatsu. MAEDA***

Abstract Trend of micro-joining is described. The microjoining within large scale integration (LSI) packages can be classified into three methods; wire bonding (WB), tape automated bonding (TAB), and flip chip bonding (FCB). In the present paper, Au wire (ball) bonding, FCB, Al wire bonding and Al ribbon bonding are discussed to understand the ultrasonic bonding mechanisms. Each type of microjoining takes on various aspects but has common bonding mechanisms regarding friction slip, plastic deformation, and friction heating. In the present paper, solid-state microjoining mechanisms in Au wire (ball) bonding, FCB, Al wire bonding, and Al ribbon bonding are discussed to systematically understand the common bonding mechanisms. Ultrasonic vibration enhances friction slip and plastic deformation, making it possible to rapidly obtain dry interconnects. Metallic adhesion at the central area of the bonding interface is mainly produced by the friction slip. On the other hand, the folding of the lateral side surfaces of the Au bump, Au ball, and Al wire is very important for increasing the bonded area. The central and peripheral adhesions are achieved by a slip-and-fold mechanism. The solid-state microjoining mechanisms are discussed based on experimental results. Fig. 1 shows scanning electron microscopic (SEM) photos of bonded top surfaces of Au bump for understanding the slip-and-fold-mechanism in FCB. Keywords Micro-joining; Electronics packaging; Low temperature; Wire bonding; Flip chip bonding; Ultrasonic; Al wire; Al ribbon

Fig. 1 SEM photos of the bonded top surfaces of Au bumps after etching the Al pads. Circles are drawn with white dotted lines. They express the diameter (~60μm) of the initial bonding surface (upper side of the bump). The blackish brown area is an alloy reaction phase. (a) high load and high ultrasonic power conditions (F = 1.0 N/bump, WUS = 300mW, t = 150ms). (b) low load and low ultrasonic power conditions (F = 0.43 N/bump, WUS = 50 mW, t = 100 ms).

* Specially Appointed Professor ** Graduate School Student

*** Nihon University

20

JWRI Cooperative Research Program, Joint Use / Research Award Quarterly J. Japan Welding Soc. 35, 2 (2017), 47s-50s.

Study on Control of Cathode Spot Behavior in Arc Welding Toshifumi Yuji*, Atsuhi Fujimaru*, Kentaro Yasui*, Hiroyuki Kinoshita*, Toshio Bouno**, Shinichi Tashiro***, Manabu Tanaka****

Abstract (135Words) This study aims to clarify the mechanism of oxide layer removal process by cathode spots in AC TIG welding of aluminum plates and also to develop the technology to improve the oxide layer removal efficiency through the control of the cathode spot behavior. As a result of the observation of cathode spots with an ultra-high-speed video camera, it is found that the cathode spot velocity gradually increases with time during EP phase and reaches maximally 300 m/s. Furthermore, the average position of cathode spots is shifted toward the fringe of the weld pool in which the oxide layer still exists and arrives there around the end of EP phase. From this result, it is considered that the removal of the oxide layer by cathode spots is effectively performed only around the end of EP phase. Keywords AC TIG welding; Aluminum; Cathode spot, Oxide layer removal;

* Miyazaki University ** National Institute of Technology, Sasebo College

*** Assistant Professor **** Professor

Fig.1. Behavior of cathode spots around the end of EP phase observed with an ultra-high-speed video camera.

Fig.2. Distribution of cathode spot velocity around the end of EP phase.

21

JWRI Cooperative Research Program, Joint Use / Research Award Applied Physics B-Lasers and Optics,119,(2015),545-549 https://doi.org/10.1007/s00340-015-6059-3

Surface Morphology of Ti-6Al-4V Plate Fabricated by Vacuum Selective Laser Melting Y. Sato*, M. Tsukamoto**, Y. Yamashita***

Abstract (126 Words) A plate made of Ti-6Al-4V (Ti64) was built by vacuum selective laser melting (SLM) at a pressure

of 10-2 Pa. The vacuum SLM system employed a single mode fiber laser and three-axis galvanic mirror in order to form 3D metallic structure. In order to investigate the surface morphology on the fabricated plates, Vickers micro hardness and surface roughness Ra were measured. From the results, the Vickers micro hardness of the fabricated plates was recorded at 391 HV, higher than the typical 340 HV for a Ti64 plate. It was also determined that crystal orientation was evaluated with X-ray diffraction. From the results, the crystal orientation of powder is composed mainly of martensitic alpha. Diffraction peaks corresponding to β (110) were detected in vacuum SLM processed samples.

Keywords Power Density Crystal Orientation, Additive Manufacturing, Molten Pool, Selective Laser Melting

* Specially Appointed Researcher ** Associate Professor

*** Industrial Research Institute of Ishikawa

Fig. Optical images of the fabricated plate surfaces with a scanning speed of 50 mm/s and a hatching distance of 100 μm. Images (a) and (c) experienced a laser power density of 1.7x105 W/cm2, while (b) and (d) had 1.1x106 W/cm2. Images (c) and (d) are a higher magnification of (a) and (b), respectively.

22

JWRI Cooperative Research Program, Joint Use / Research Award Journal of light metal welding, 52, (2014), 453-462. doi: https://doi.org/10.11283/jlwa.52.453 Dissimilar spot welding of three lapped sheets of aluminum alloy and steels by metal flow -Application of Friction Anchor Welding to three lapped sheets of aluminum alloy and steels-

/ / 3 - / / 3 - Masaru SAKAMURA*, Kaoru OHISHI**, Kouhei OTA***, Yoshihiro TAKEYASU****, Shigeyuki MIZUNARI*****, Hidetoshi FUJII******

, , , ,

Abstract A novel spot welding process for dissimilar metal lap joints using a new tool with the tip made of spherical ceramics, i.e., “Friction Anchor Welding,” was applied to three lapped sheets that consisted of an Al alloy (1.0-mm-thick A5052) and two steels (0.6-mm- and 1.0-mm-thick SPCC). Consequently, a steel projection was formed in the Al alloy sheet, and the sheets were welded at a plunge depth greater than 1.4 mm. The height of this steel projection increased with the plunge depth when the plunge depth was less than 2.2 mm; accordingly, the weld strength increased, and the tensile shear strength and the cross tensile strength reached approximately 3.8 kN/point and 2.5 kN/point, respectively. However, when the plunge depth was greater than 2.2 mm, the tip of the steel projection peeled off from the Al alloy, followed by cracks formation along the steel projection and the Al alloy interface, and the weld strength consequently decreased. Keywords Dissimilar metals, Metal flow, Projection, Three sheets, Steel, Aluminum alloy

Fig. Cross-sectional macro image of the specimen (Pd: 2.2 mm).

* Hiroshima Prefectural Technology Research Institute ** Hiroshima Prefectural Technology Research Institute *** Hiroshima Prefectural Technology Research Institute **** Hiroshima Prefectural Technology Research Institute ***** Hiroshima Prefectural Technology Research Institute ****** Professor

23

JWRI Cooperative Research Program, Joint Use / Research Award Quarterly J. Japan Welding Soc., 35, 2 (2017) 165s-168s Anisotropic Damage Constitutive Law for Cleavage Failure in Crystalline Grain by Cohesive Zone Model Yuichi SHINTAKU*, Kenjiro TERADA**, Seiichiro TSUTSUMI***

Abstract (146Words) The objective of this study is to propose new anisotropic damage constitutive law that

represents the separation process on cleavage plane in a polycrystalline aggregate. The proposed law is formulated by embedding of the cohesive zone model (CZM) in a crystal plasticity constitutive law. The separation of the cleavage plane can be realized by exponential type of the CZM based on an atomic potential. On the other hands, the crystal plasticity constitutive law is used to simulate the deformation due to the crystalline slip on each crystallographic system. Thus, the proposed damage constitutive law is capable of representing the microscopic mechanism characterized by both the fracture behavior of the cleavage plane and the plastic deformation of the crystallographic slip. It is confirmed that the proposed model enables us to simulate the crack propagation in arbitrary directions, and the resultant anisotropic strength in a single crystal grain.

Keywords

Brittle fracture; Cleavage failure; Anisotropic damage; Crystal plasticity; Cohesive zone model

Fig. 1 Crack propagation with distribution of at final step.

Fig. 2 Apparent stress-strain curve during crack propagation in single crystalline grain.

* Department of Engineering, University of Tsukuba ** International Research Institute of Disaster Science, Tohoku University

*** Associate Professor

24

CONTRIBUTIONS TO OTHER ORGANIZATIONS (January 2017 ~ December 2017)

[Physics, Processes, Instruments & Measurements]

S. SASO, M. MOURI, M. TANAKA and S. KOSHIZUKA

Numerical Analysis of Two-Dimensional Welding Process Using Particle Method

Weld. World, Vol. 60 (2017), pp. 127-136.

M. TANAKA Future Prospects of Smart Welding Process

J. Smart Process., Vol. 6, No. 1 (2017), pp. 4-6 (in Japanese).

K. HAYASHI, H. TERASAKI, Y. MIYAHARA, M. TANAKA, K. KONISHI, H. INOUE and Y. HAYASHI

Study on the Upset Welding of Shear Reinforcement with Large Diameter

Q. J. Jpn. Weld. Soc., Vol. 35, No. 2 (2017), pp. 9s-12s (in Japanese).

M. TANAKA Future Prospects of Optimization for Arc Welding Technology

Welding Technol., Vol. 65, No. 2 (2017), pp. 40-45 (in Japanese).

M. SETO, M. TANAKA, S. TASHIRO and A. AOKI Study on New GMA Welding Process with Duplex

Current Feeding - Influence of Welding Wire – Q. J. Jpn. Weld. Soc., Vol. 35, No. 2 (2017), pp. 56s-60s.

B. XU, F. JIANG, M. TANAKA, S. TASHIRO, N. V. ANH and S. CHEN

Numerical Analysis of Plasma Arc Physical Characteristics under Additional Constraint of Keyhole

IIW Annual Assembly in Shanghai, 2017 (USB), (2017), Xu_212-1471-17_XII-2344-17.

K. KONISHI, M. TANAKA, M. SHIGETA, K. ISHIDA, A. KUROKAWA, T. TAKIDA, S. NAKABAYASHI and A. TSUJI

Numerical Analysis of Dynamic Behavior of Additives in Electrode During TIG Welding Process

Q. J. Jpn. Weld. Soc., Vol. 35, No. 2 (2017), pp. 73-84 (in Japanese).

K. KONISHI, M. TANAKA, M. SHIGETA, A. MURATA, T. MURATA and A. B. MURPHY

Computational Analysis of Arc Phenomena during GTA Welding with a Constricted Nozzle

Proc. CHT-17, (2017), CHT-17-229.

M. TANAKA Visualizations and Numerical Simulations in Welding Processes

Nishiyama Memorial Seminar "The Forefront of Welding Technology Educing the Performance of Steel", (2017), pp. 23-48 (in Japanese).

T. KOBASHI, Y. MURAI, M. HADANO, T. ERA, T. OKAMOTO, M. TANAKA and T. SUGA

Research on Laser-Arc Hybrid Welding of Lap Fillet Joints of Steel Sheet

70th Annual Assembly of Int. Inst. Welding (IIW), (2017), IIW Doc. XII-2309-17.

M. TANAKA International Activities

J. Jpn. Weld. Soc., Vol. 86, No. 5 (2017), 344 (in Japanese).

S. ASAI, M. TANAKA, S. YAMANE, F. MIYASAKA and K. NOMURA

Technical Commission on Welding Processes J. Jpn. Weld. Soc., Vol. 86, No. 5 (2017), pp. 347-356 (in Japanese).

M. TANAKA Introduction to Welding Technology

Textbook for HPI technology seminar, (2017), pp. 117-163 (in Japanese).

M. TANAKA Introduction to Welding Process

Textbook for summer school of welding engineering, (2017), pp. 1-28 (in Japanese).

H. PARK, M. TRAUTMANN, K. TANAKA, M. TANAKA and A. B. MURPHY

Mixing of Multiple Metal Vapours into an Arc Plasma in Gas Tungsten Arc Welding of Stainless Steel

J. Phys. D-Appl. Phys., Vol. 50 (2017), 43LT03 (7pp).

S. CHOUDHURY, A. SHARMA, U. K. MOHANTY, R. KASAI, M. KOMURA, M. TANAKA and T. SUGA

Mathematical Model of Complex Weld Penetration Profile: A Case of Square AC Waceform Arc Welding

J. Manuf. Process., Vol. 30 (2017), pp. 483-491.

25

M. TANAKA State-of-the-art Research on Welding Process in Japan

Proc. WSE & CAWE 2017, (2017), pp. 4-9.

J. J. LOWKE, A. B. MURPHY and M. TANAKA The Physical Structure of Arc Spots in Metal Inert Gas Welding

Proc. WSE & CAWE 2017, (2017), pp. 93-96.

S. MATSUDA, Y. TANAHARA and M. TANAKA Penetration Control of Arc Welding Utilizing Electromagnetic Controlled Molten Pool Welding Process

Proc. WSE & CAWE 2017, (2017), pp. 118-122.

M. TANAKA, K. KONISHI, M. SHIGETA, T. TAKIDA, S. NAKABAYASHI and A. TSUJI

Numerical Simulation of TIG Arcs Including Tungsten Electrode Phenomena

Proc. IWIT & TWIT 2017, (2017), pp. 61.

M. TANAKA Trends in Advanced Research on Visualizations of Welding Arcs

Proc. 3rd Int. Workshop on Welding and Joining (IWWJ) 2017, (2017), pp. 27-31.

K. KONISHI, M. TANAKA, M. SHIGETA, A. MURATA and T. MURATA

Visualization of Arc Phenomena during TIG Welding with a Constricted Nozzle


K. KONISHI, M. SHIGETA, M. TANAKA, A. MURATA, T. MURATA and A. B. MURPHY

Numerical Study on Thermal Non-Equilibrium of Arc Plasmas in TIG Welding Processes Using a Two-Temperature Model

Weld. World, Vol. 61, No. 1 (2017), pp. 197-207.

H. KOMEN, M. SHIGETA, M. TANAKA, M. NAKATANI and Y. ABE

Simulation of Flux Melting Process during a SAW by DEM-ISPH Hybrid Method

Q. J. Jpn. Weld. Soc., Vol. 35, No. 2 (2017), pp. 38s-41s.

T. METHONG, M. SHIGETA, M. TANAKA, R. IKEDA, M. MATSUSHITA and T. KATAOKA

Diagnostic of Heat Source Characteristics in Gas Metal Arc Welding Using CO2 Shielding Gas


K. KONISHI, M. SHIGETA, M. TANAKA, A. MURATA, T. MURATA and A. B. MURPHY

Numerical Analysis of Heat Source Characteristics of a Constricted TIG Arc for Welding of Aluminium

J. Light. Met. Weld., Vol. 55, No. 6 (2017), pp. 227-232 (in Japanese).

T. METHONG, T. YAMAGUCHI, M. SHIGETA, M. TANAKA, R. IKEDA, M. MATSUSHITA and B. POOPAT

Effect of Rare Earth Metal on Plasma Properties in GMAW Using CO2 Shielding Gas

Weld. World, Vol. 61, No. 5 (2017), pp. 1039–1047.

T. METHONG, M. SHIGETA, M. TANAKA, R. IKEDA, M. MATSUSHITA and B. POOPAT

Visualization of Gas Metal Arc Welding on Globular to Spray Transition Current

Sci. Technol. Weld. Joining, (2017), pp. 87-94.

H. KOMEN, S. MATSUI, K. KONISHI, M. SHIGETA, M. TANAKA and T. KAMO

Modeling of Submerged Arc Welding Phenomena and Experimental Study of the Heat Source Characteristics


M. SHIGETA Time-dependent 3D Simulation of Nanopowder Growth and Transport in a Turbulent Field Induced by a Thermal Plasma Jet

Book of Extended Abstracts of the 23rd International Symposium on Plasma Chemistry, (2017), pp. 661-663.

K. TANAKA, M. SHIGETA, M. TANAKA and A. B. MURPHY Observation of Dynamic Metal Vapor Behavior in Gas Tungsten Arc Welding

Proc. WSE & CAWE 2017, (2017), pp. 218-221.

S. MIKI, K. KONISHI, M. SHIGETA, M. TANAKA, A. MURATA and T. MURATA

Measurements of Oxygen Contamination in TIG Welding with a Constricted Nozzle

Proc. WSE & CAWE 2017, (2017), pp. 414-417.

T. METHONG, M. SHIGETA, M. TANAKA, R. IKEDA and M. MATSUSHITA

Plasma Charatceristics of Gas Metal Arc Welding on Globular Sypray Transition Current

Proc. IWIT & TWIT 2017, (2017), pp. 25.

26

H. KOMEN, M. SHIGETA and M. TANAKA Cumputational Analysis of Weld Pool Convection Phenomena during Gas Metal Arc Welding Using Tree-dimensional Incompressible SPH Method

Proc. IWIT & TWIT 2017, (2017), pp. 27.

K. TANAKA, M. SHIGETA and M. TANAKA Visualization of Metal Vapor Behavior in Helium Plasma during Gas Tungsten Arc Welding

Proc. IWIT & TWIT 2017, (2017), pp. 29.

A. KUROKAWA, K. KONISHI, M. SHIGETA and M. TANAKA Effect of Surface Tension on Simulation of Weld Pool Formation in TIG Welding

Proc. IWIT & TWIT 2017, (2017), pp. 36.

M. SETO, A. AOKI, S. TASHIRO and M. TANAKA Comparison of Wettability of Beads in MIG Welding Process with Duplex Current Feeding and Conventional MIG Welding Process


S. MAENAKA, S. TASHIRO, A. B. MURPHY, K. FUJIT and M. TANAKA

Evaluation of Radiation Characteristics of Xenon Short Arc Lamp by Numerical Simulation


S. B. MAMAT, S. TASHIRO and M. TANAKA Observation of Metal Transfer in Plasma MIG Welding Process


T. YUJI, S. TASHIRO, T. METHONG, H. KINOSHITA, K. YASUI, T. BOUNO, N. KAMATA, L. H. PHAN and M. TANAKA

Influence of Admixture of Oxygen into Shielding Gas on Cathode Spot Behavior


S. TASHIRO, M. TANAKA, M. SETO and A. AOKI Numerical Analysis on Influence of Electrical Conductivity of Wire on Droplet Temperature in Duplex Current Feeding MIG Welding


S. TASHIRO, A. V. NGUYEN, M. SADAIKE, Y. MATSUMOTO, Y. YAMAGUCHI and M. TANAKA

Influence of Preheating on Oxygen Plasma Cutting Process


N. V. ANH, S. TASHIRO, B. V. HANH and M. TANAKA Influence of Pilot Gas Composition on Convective Pattern on Weld Pool Surface in Plasma Keyhole Arc Welding


S. TASHIRO, A. B. MURPHY and M. TANAKA Numerical Simulation of Fume Formation Process in GMA Welding

IIW Annual Assembly in Shanghai, 2017 (USB), (2017), Doc. 212-1484-17.

L. TRAN, V. A. NGUYEN, S. TASHIRO, M. TANAKA and T. H. NGUYEN

Development of Plasma-Mig Hybrid Welding Process for Butt Joint Welding of Thick Plate Steel

J. Sci. Technol., Vol. 119 (2017), pp. 11-15.

N. V. ANH, S. TASHIRO, B. V. HANH and M. TANAKA Development of Plasma-MIG Hybrid Welding Process


L. TRAN, S. TASHIRO, M. TANAKA and T. H. NGUYEN Single Pass Full Penetration Welding of 12-mm Thick Mild Steel with Square Edge Preparation Using Plasma - MIG Hybrid Welding Process

Front. Appl. Plasma Technol., Vol. 10, No. 2 (2017), pp. 65-70.

N. V. ANH, N. H. MANH, B. V. HANH, S. TASHIRO and M. TANAKA

Influence of Welding Current on Molten Pool Flow during Plasma Keyhole Arc Welding


S. B. MAMAT, T. METHONG, S. TASHIRO and M. TANAKA Droplet Temperature Measurement in Metal Inert Gas Welding Process by Using Two Color Temperature Measurement Method


27

N. V. ANH, S. TASHIRO, B. V. HANH and M. TANAKA Experimental Investigation on Weld Pool Formation Process in Plasma Keyhole Arc Welding

J. Phys. D-Appl. Phys., Vol. 51 (2017), 015204 (14pp).

G. UCHIDA, K. KAWABATA, T. ITO, K. TAKENAKA and Y. SETSUHARA

Development of a Non-Equilibrium 60 MHz Plasma Jet with a Long Discharge Plume

J. Appl. Phys., Vol. 122 (2017), pp. 033301-1-033301-8.

G. UCHIDA, K. TAKENAKA, K. TAKEDA, K. ISHIKAWA, M. HORI and Y. SETSUHARA

Selective Production of Reactive Oxygen and Nitrogen Species in the Plasma Treated Water by Using a Nonthermal High-Frequency Plasma Jet

Jpn. J. Appl. Phys., Vol. 57, No. 1 (2017), pp. 0102B4-1-0102B4-6.

Y. SATO, M. TSUKAMOTO, Y. YAMASHITA, S. MASUNO, K. YAMASHITA, S. YAMAGATA and R. HIGAASHINO

Titanium Alloy Plate Fabrication by Sputter-less Selective Laser Melting

IEICE Trans. Fundam. Mater., Vol. 137, No. 5 (2017), pp. 265-270 (in Japanese).

T. OHKUBO, Y. SATO, E. MATSUNAGA and M. TSUKAMOTO

Three-Dimensional Numerical Simulation during Laser Processing of CFRP

Appl. Surf. Sci., Vol. 417, (2017), pp. 104-107

M. TSUKAMOTO Guide to Development of Innovative Joining Technology-Surface Modification with Lasers-


M. TSUKAMOTO Development of Laser Technology for Additive Manufacturing of Metal


M. TSUKAMOTO Innovative Design/Manufacturing Technologies Research and Development of the Laser Coating Technology to Realize High Value-added Design and Fabrication-100W Blue Diode Laser Coating System-

J. Jpn. Laser Processing Soc., Vol. 24, No. 2 (2017), pp. 4-6 (in Japanese).

P. CHEN, M. MIYAKE, M. TSUKAMOTO, Y. TSUTSUMI and T. HANAWA

Response of Preosteoblasts to Titanium with Periodic Micro/nanometer Scale Grooves Produced by Femtosecond Laser Irradiation

J. Biomed. Mater. Res. Part A, Vol. 105, No. 12 (2017), pp. 3456-3464.

M. TSUKAMOTO Development of High Intensity Blue Diode Laser for Advanced Materials Processing

Rev. Laser Eng., Vol. 45, No. 9 (2017), pp. 576-579 (in Japanese).

N. MATSUMOTO, Y. KAWAHITO, K. NISHIMOTO and S. KATAYAMA

Effects of Laser Focusing Properties on Weldability in High-Power Fiber Laser Welding of Thick High-Strength Steel Plate

J. Laser Appl., Vol. 29, No. 1 (2017), 12003.

M. GONG, Y. KAWAHITO, M. GAO and X. ZENG Weld Characterization of Laser Arc Hybrid Welding of Pure Copper

Int. J. Adv. Manuf. Technol., (2017), pp. 1-7.

M. GONG, Y. KAWAHITO, G. LI, M. GAO and X. ZENG Stabilization Effect of Space Constraint in Narrow Gap Laser-Arc Hybrid Welding Analyized by Approximate Entropy

Int. J. Adv. Manuf. Technol., (2017), pp. 1-10.

H. TADAA, H. NAKAMURA, T. SHOBU, R. KITAI, K. KIKUTA and Y. KAWAHITO

Effect of Laser Solution-Treatment on a Ti-based Shape Memory Alloy

Mater. Res. Bull., Vol. 90 (2017), pp. 41-46.

K. KANG, Y. KAWAHITO, M. GAO and X. ZENG Effects of Laser-Arc Distance on Corrosion Behavior of Single-Pass Hybrid Welded Stainless Clad Steel Plate

Mater. Des., Vol. 123, No. 5 (2017), pp. 80-88.

M. GAO, Y. KAWAHITO and S. KAJII Observation and Understanding in Laser Welding of Pure Titanium at Subatmospheric Pressure

Opt. Express, Vol. 25, No. 12 (2017), pp. 13539-13548.

H. WANG, Y. KAWAHITO, R. YOSHIDA, Y. NAKASHIMA and K. SHIOKAWA

Development of a High-Power Blue Laser (445nm) for Material Processing

Opt. Lett., Vol. 42, No. 12 (2017), pp. 2251.

28

H. WANG, M. NAKANISHI and Y. KAWAHITO Effects of Welding Speed on Absorption Rate in Partial and Full Penetration Welding of Stainless Steel with High Brightness and High Power Laser

J. Mater. Process Technol., No. 249 (2017), pp. 193-201.

M. MIYAGI, Y. KAWAHITO, H. KAWAKAMI and T. SHOUBUD

Dynamics of Solid-Liquid Interface and Porosity Formation Determined through X-Ray Phase-Contrast in Laser Welding of Pure Al

J. Mater. Process Technol., Vol. 250 (2017), pp. 9-15.

A. SHARMA, B. VIJENDRA, K. ITO, K. KOHAMA, M. RAMJI and B. V. H. SAI

A New Process for Design and Manufacture of Tailor-made Functionally Graded Composites through Friction Stir Additive Manufacturing

J. Manuf. Process., Vol. 26 (2017), pp. 122-130.

T. SAWADA, T. NABATAME, T. D. DAO, I. YAMAMOTO, K. KURISHIMA, T. ONAYA, A. OHI, K. ITO, M. TAKAHASHI, K. KOHAMA, T. OHISHI, A. OGURA and T. NAGAO

Improvement of Smooth Surface of RuO2 Bottom Electrode on Al2O3 Buffer Layer and Characteristics of RuO2/TiO2/Al2O3/TiO2/RuO2 Capacitors

J. Vac. Sci. Technol. A, Vol. 35, No. 6 (2017).

K. ITO, H. YAMAMOTO, M. TAKAHASHI, K. KOHAMA and H. FUJII

Application of Friction Stir Processing to High-tensile-steel Welds

Proc. WSE & CAWE 2017, (2017), pp. 263-266.

K. ITO, H. YAMAMOTO, T. OKUDA, H. IZUMI, M. TAKAHASHI, K. KOHAMA and H. FUJII

Application of Friction Stir Processing to High-tensile-steel Welds

Proc. IWIT & TWIT 2017, (2017), pp. 12-18.

A. HEYA, F. KUSAKABE, N. MATSUO, K. KANDA, K. KOHAMA and K. ITO

Formation of Nanocrystalline Silicon in SiO X by Soft X-ray Irradiation at Low Temperature

Jpn. J. Appl. Phys., Vol. 56, No. 3 (2017), pp. 035501-1-035501-5.

K. TAKANO, N. KOIZUMI, H. SERIZAWA, S. TSUBOTA and Y. MAKINO

Development of Laser Welding Technology for Fully Austenitic Stainless Steel

Welding Int., Vol. 31, No. 11 (2017), pp. 827-836.

S. SATO, H. SERIZAWA and F. MIYASAKA Numerical Ananlysis of Penetration Shape in Practical Aluminum Joint By Using 3D Non-Stationary Thermal Model

Proc. National Symp. on Welding Mechanics and Design 2017, (2017), pp. 125-130 (in Japanese).

H. MOTOKI, H. SERIZAWA, Y. ASAKURA, N. NAKAZATO, Y. SATO, M. TSUKAMOTO, J. S. PARK, H. KISHIMOTO and A. KOHYAMA

Study on Packing Method of Ti Powder in Joining Process of Zircaloy and SiC/SiC Compoistes By Using Laser


H. OGURA, H. SERIZAWA, Y. MORISADA, H. FUJII, H. MORI and T. NAGASAKA

Study on V Alloy/Stainless Steel Dissimilar Joint Made by Friction Stir Welding


T. OHMURA, T. -W. LIAN, A. KONDO, R. HAYASAKA and M. NAITO

Measurement Method of Thermal Conductivity in Ununiformed Temperature Field

Netsu Bussei, Vol. 31, No. 4 (2017), pp. 166-173 (in Japanese).

G. FAN, H. HUANG, Z. TAN, D. XIONG, Q. GUO, M. NAITO, Z. LI and D. ZHANG

Grain Refinement and Superplastic Behavior of Carbon Nanotube Reinforced Aluminum Alloy Composite Processed by Cold Rolling

Mater. Sci. Eng. A., Vol. 708, No. 21 (2017), pp. 537-543.

M. NAITO, T. KOZAWA and A. KONDO Improvement of All-Solid-State Battery and the Development of Its Manufacturing Technology (Book)

Published by Technical Information Institute Co., Ltd, (2017) (in Japanese).

M. NAITO Novel Powder Processing Technology for the Development of New Materials (Book)

Published by CMC Publishing Co., Ltd., (2017) (in Japanese).

29

M. NAITO Pocketbook of Powder Technology Terminology (Book)

Published by The Nikkan Kogyo Shimbun, Ltd., (2017) (in Japanese).

M. MATSUOKA, A. KONDO, T. KOZAWA, M. NAITO, H. KOGA, T. SAITO and H. IBA

Effect of Carbon Addition on One-Step Mechanical Synthesis of LiCoPO4/C Composite Granules and Their Powder Characteristics

Ceram. Int., Vol. 43 (2017), pp. 938-943.

K. KANAI, Y. FUKUI, T. KOZAWA, A. KONDO and M. NAITO

The Synthesis of YAG:Ce3+ Phosphor by Mechanical Method

J. Soc. Powder Technol. Jpn., Vol. 54, No. 1 (2017), pp. 32-36 (in Japanese).

S. SUZUKI, T. KOZAWA, T. MURAKAMI and M. NAITO Mechanochemical-hydrothermal Synthesis of Layered Lithium Titanate Hydrate Nanotubes at Room Temperature and Their Conversion to Li4Ti5O12

Mater. Res. Bull., Vol. 90 (2017), pp. 218-223.

T. -W. LIAN, A. KONDO, T. KOZAWA, M. AKOSHIMA, H. ABE, T. OHMURA, W. TUAN and M. NAITO

Effect of Hydrophobic Nano-Silica on the Thermal Insulation of Fibrous Silica Compacts

J. Asian. Ceram. Soc., Vol. 5, No. 2 (2017), pp. 118-122.

K. KANAI, Y. FUKUI, T. KOZAWA, A. KONDO and M. NAITO

Effect of Flux Powder Addition on the Synthesis of YAG Phosphor by Mechanical Method

Adv. Powder Technol., (2017). in Press.

X. LIU and H. NISHIKAWA Pressureless Sintering Bonding Using Hybrid Microscale Cu Particle Paste on ENIG, Pure Cu and Pre-Oxidized Cu Substrate by an Oxidation-Reduction Process

J. Mater. Sci. -Mater. Electron., Vol. 28, No. 7 (2017), pp. 5554-5561.

A. N. ALHAZAA, S. H. ALGHARBI and H. NISHIKAWA Effect of Bonding Temperature on the Joining of Ti-6Al-4V Alloy Using Cu Coatings and Sn Interlayers

J. Mater. Eng. Perform., Vol. 26, No. 1 (2017), pp. 407-417.

X. LIU, S. HE and H. NISHIKAWA Low Temperature Solid-State Bonding Using Sn-coated Cu Particles for High Temperature Die Attach

J. Alloy. Compd., Vol. 695 (2017), pp. 2165-2172.

G. K. SUJAN, A. S. M. A. HASEEB, H. NISHIKAWA and M. A. AMALIN

Interfacial Reaction, Ball Shear Strength and Fracture Surface Analysis of Lead-Free Solder Joints Prepared Using Cobalt Nanoparticle Doped Flux


S. ZHOU, S. HE and H. NISHIKAWA Effect of Substrate Metallization on the Impact Strength of Sn-Ag-Cu Solder Bumps Fabricated in a Formaic Acid Atomosphere

Proc. 2017 Int. Conf. on Electronics Packaging(ICEP 2017), (2017), pp. 381-385.

M. -H. ROH, H. NISHIKAWA, S. TSUTSUMI, N. NISHIWAKI, K. ITO, K. ISHIKAWA, A. KATSUYA, N. KAMADA and M. SAITO

Effect of Temperature and Substrate on Shear Strength of the Joints Formed by Sintering of Micro-Sized Ag Particle Paste without Pressure


C. YANG, C. R. KAO and H. NISHIKAWA Development of Die Attachment Technology for Power IC Module by Introducing Indium into Sintered Nano-silver Joint

Proc. 67th Electronic Components and Technology Conf. (ECTC2017), (2017), pp. 1974-1980.

T. CHOU, W. TUAN, H. NISHIKAWA and B. WENG Brazing Graphite to Aluminum Nitride for Thermal Dissipation Purpose

Adv. Eng. Mater., Vol. 19, No. 7 (2017), pp. 1-10.

H. NISHIKAWA, X. LIU and S. HE Effect of Isothermal Aging at 250 C° on Shear Strength of Joints Using Sn-Coated Cu Particle Paste for High-Temperature Application

Proc. IMPAS Int. Conf. on High Temparature Electronics Network (HiTEN 2017), Vol. 2017, No. HiTen (2017), pp. 202-206.

S. ZHOU, X. LIU, O. MOKHTARI and H. NISHIKAWA The Evaluation of Mechanical Properities of Sn58BiXTi Solder by Tensile Test

Proc. 18th Int. Coference on Electronic Pacaging Technology, (2017), pp. 703-704.

30

M. KIM and H. NISHIKAWA Influence of ENIG Defects on Shear Strength of Pressureless Ag Nanoparticle Sintered Joint under Isothermal Aging

Microelectron. Reliab., Vol. 76-77 (2017), pp. 420-425.

X. LIU, S. ZHOU and H. NISHIKAWA Thermal Stability of Low-Temperature Sintered Joint Using Sn-coated Cu Particles during Isothermal Aging at 250 ºC


H. NISHIKAWA, X. LIU and S. HE Effect of Bonding Conding Conditions on Shear Strength of Joints at 200 C Using Sn-coated Cu Particle

Proc. 18th Int. Coference on Electronic Pacaging Technology, (2017), pp. 181:1-181:4.

Y. ZHANG, S. HE and H. NISHIKAWA Impact Strength of Sn-Ag-Cu/Cu Solder Bumps Formed by an Induction Heating Method

Proc. 12th Int. Microsystems, Packaging, Assembly and Circuits Technology, (2017), pp. 159-162.

M. KIM and H. NISHIKAWA

Transmission Electron Microscopy Investigation on the Oxidation Behavior of Electroless Ni/immersion Au Surface Finish at 250 C

J. Nanosci. Nanotechnol., Vol. 17, No. 11 (2017), pp. 8522-8527.

J. BANG, D. YU, Y. KO, M. KIM, H. NISHIKAWA and C. LEE

Intermetallic Compound Formation and Mechanical Property of Sn-Cu-xCr/Cu Lead-Free Solder Joint


E. CHUN, M. KIM, H. NISHIKAWA, C. PARK and J. SUH Laser-assisted Selective Fusing of Thermal Sprayed Ni-based Self-Fluxing Alloys by Using High-Power Diode Lasers

Opt. Laser Technol., Vol. 100 (2017), pp. 317-324.

Y. SUZUKI, H. ABE, H. YAMAMOTO, K. ITO, H. INOUE and M. NAKAMURA

Spherical Porous Granules in MgOFe2O3Nb2O5 System: In Situ Observation of Formation Behavior Using High-Temperature Confocal Laser-Scanning Microscopy

J. Eur. Ceram. Soc., Vol. 37, No. 16 (2017), pp. 5339- 5345.

D. TANIGAWA, Y. FUNADA, N. ABE, M. TSUKAMOTO, Y. HAYASHI, H. YAMAZAKI, Y. TATSUMI and M. YONEYAMA

Suppression of Dilution in Ni-Cr-Si-B Alloy Cladding Layer by Controlling Diode Laser Beam Profile

Opt. Laser Technol., Vol. 99 (2017), pp. 326-332.

T. MIWA, D. KITAGAWA, K. NAGATSUKA, H. YAMAOKA, K. ITO and K. NAKATA

Dissimilar Materials Joining between Stainless Steel and Carbon Fiber Reinforced Thermoplastic by Friction Lap Joining


K. NAGATSUKA, B. XIAO, L. WU, K. NAKATA, S. SAEKI, Y. KITAMOTO and Y. IWAMOTO

Resistance Spot Welding of Metal/carbon-Fibre-Reinforced Plastics and Applying Silane Coupling Treatment

Sci. Technol. Weld. Joining, (2017), pp. 1-6.

K. NAGATSUKA and K. NAKATA Multi-material related Technologies for Automotive Body Structures (Book) Published by NTS, Inc., (2017) (in Japanese).

Z. HENG, S. UCHIDA and Y. TAKAHASHI

The Influence of Oxygen Diffusion Path at Carbon Cathode on Electrochemical Discharge Performance in Mg-Air Batteries

Microjoining and Assembly Technology in Electronics, Vol. 23 (2017), pp. 305-308 (in Japanese).

Y. TAKAHASHI and T. NAKAMURA Numerical Study on Interfacial Extension Behaviors during Solid-State Pressure Welding

Int. Conf. on Innovative Technologies IN-TECH 2017, (2017), pp. 89-92.

Y. TAKAHASHI, H. FUKUDA, Y. YONESHIMA, H. KITAMURA and M. MAEDA

Solid-State Microjoining Mechanisms of Wire Bonding and Flip Chip Bonding

J. Electron. Packag., Vol. 139, No. 41010 (2017), pp. 1-13.

31

[Materials, Metallurgy & Weldability]

D. M. BENATI, K. ITO, K. KOHAMA, H. YAMAMOTO and E. J. ZOQUI

Study on the Microstructure and Liquid Phase Formation in a Semisolid Gray Cast Iron

Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci., Vol. 48, No. 5 (2017), pp. 2293-2303.

Y. SHIBAMOTO, Y. MIKAMI and M. MOCHIZUKI Modeling of Hydrogen Diffusion Behavior Considering the Microstructure of Duplex Stainless Steel Weld Metal


Y. MIKAMI, Y. SHIBAMOTO, G. OGITA, K. ITO and M. MOCHIZUKI

Numerical Modeling of Diffusible Hydrogen Localization in Duplex Stainless Steel Weld Metal

Proc. WSE & CAWE 2017, (2017), pp. 145-148.

M. IMAM, Y. SUN, H. FUJII, N. MA, S. TSUTSUMI and H. MURAKAWA

Microstructural Characteristics and Mechanical Properties of Friction Stir Welded Thick 5083 Aluminum Alloy

Metall. Mater. Trans. A, (2017), pp. 1-22.

J. CHEN, H. FUJII, Y. SUN, Y. MORISADA and K. KONDOH Optimazation of Mechanical Properties of Fine-Grained Non-Combustive Magnesium Alloy Joint by Asymmetrical Double-Sided Friction Stir Welding

J. Mater. Process. Technol., Vol. 242 (2017), pp. 117-125.

Y. SUN and H. FUJII

Effect of Abnornal Grain Growth on Microstructure and Mechanical Properties of Friction Stir Welded SPCC Steel Plates

Mater. Sci. Eng. A., Vol. 694 (2017), pp. 81-92.

Y. AOKI, R. KUROIWA, H. FUJII, G. MURAYAMA and M. YASUYAMA

Linear Friction Stir Welding of Medium Carbon Steel at Low Temperature

Tetsu-to-Hagane, Vol. 103, No. 7 (2017), pp. 422-428 (in Japanese).

M. IMAM, V. RACHERLA, K. BISWAS, H. FUJII, V. CHINTAPENTA, Y. SUN and Y. MORISADA

Microsructure-property Relation and Evolution in Friction Stir Welding of Naturally Aged 6063 Aluminum Alloy

Int. J. Adv. Manuf. Technol., Vol. 91, No. 8 (2017), pp. 1753-1769.

M. NAKAI, M. NIINOMI, Y. ISHIDA, H. H. LIU, H. FUJII and T. NINOMIYA

Heat Treatment to Improve Fatigue Strength of Friction Stir Welded Ti-6Al-4V Alloy Butt Joint

Mater. Trans., Vol. 58 (2017), pp. 1223-1226.

H. LIU, Y. HU, Y. ZHAO and H. FUJII Improving the Particle Distribution and Mechanical

Properties of Friction-Stir-Welded Composites by Using a Smooth Pin Tool

Mech. Compos. Mater., Vol. 53, No. 4 (2017), pp. 515-524.

X. C. LIU, Y. F. SUN and H. FUJII Clarification of Microstructure Evolution of Aluminum during Friction Stir Welding Using Liquid CO2 Rapid Cooling

Mater. Des., Vol. 129 (2017), pp. 151-163.

F. OGAWA, C. MASUDA and H. FUJII Deposition of Metalson Vapor Grown Carbon Fibers via in Situ Chemical Vapor Deposition and Fabrication of Metal Matrix Composites Utilizing Coated Fibers

Proc. Sustainable Industrial Processing Summit, 2017, (2017), pp. 1-17.

Z. G. ZHU, Y. F. SUN, M. H. GOH, F. L. NG, Q. B. NGUYEN, H. FUJII, S. M. L. NAI, J. WEI and C. H. SHEK

Friction Stir Welding of a CoCrFeNiAl0.3 High Entropy Alloy

Mater. Lett., Vol. 205 (2017), pp. 142-144.

K. M. KAREH, C. O'SULLIVAN, T. NAGIRA, H. YASUDA and C. M. GOURLAY

Dilatancy in Semi-Solid Steels at High Solid Fraction Acta. Mater., Vol. 125, No. 15 (2017), pp. 187-195.

T. NAGIRA, H. YASUDA, R. UENOKI, K. MORISHITA, A. SUGIYAMA, M. YOSHIYA and K. UESUGI

In Situ Observation of Tensile and Compressive Deformation in Semi Solid Metallic Alloys Using Time-resolved X-ray Imaging

Tetsu To Hagane-J. Iron Steel Inst. Jpn., Vol. 103, No. 12 (2017), pp. 668-677 (in Japanese).

32

I. UWABE, K. DOBARA, K. MORISHITA and T. NAGIRA, H. YASUDA

In-situ Measurement of Solute Partition Coeffcient in Fe-Cr-Ni-Mo Alloys by Using X-ray Imaging and X-ray Florescence Analysis

Tetsu To Hagane-J. Iron Steel Inst. Jpn., Vol. 103, No. 12 (2017), pp. 678-687 (in Japanese).

Y. MORISADA and H. FUJII

Process Control of Friction Stir Welding and Four-dimensional X-ray Visualization


X. C. LIU, Y. F. SUN, Y. MORISADA and H. FUJII

Dynamics of Rotational Flow in Friction Stir Welding of Aluminium Alloys


N. HATANAKA, K. NISHIMOTO, S. NISHINO, Y. MORISADA and H. FUJII

Characterization of Dissimilar Aluminum Alloy Joints by FSW

J. Light Metal Wel., Vol. 55, No. 10 (2017), pp. 392-400 (in Japanese).

H. LIU, M. NIINOMI, M. NAKAI, X. CONG, K. CHO, C. J. BOEHLERT and V. KHADEMI

Abnormal Deformation Behavior of Oxygen-Modified β-Type Ti-29Nb-13Ta-4.6Zr Alloys for Biomedical Applications

Metall. Mater. Trans. A, (2017), pp. 139-149.

P. F. SANTOS, M. NIINOMI, K. CHO, H. H. LIU, M. NAKAI, T. NARUSHIMA, K. UEDA and Y. ITOH

Effect of Mo Addition on the Mechanical Properties and Microstructures of Ti-Mn Alloys Fabricated by Metal Injection Molding for Biomedical Applications

Mater. Trans., Vol. 58 (2017), pp. 271-279.

H. LIU, M. NIINOMI, M. NAKAI, K. CHO and H. FUJII Deformation-induced ω-Phase Transformation in a β-Type Titanium Alloy during Tensile Deformation

Scr. Mater., Vol. 130 (2017), pp. 27-31.

H. LIU, M. NIINOMI, M. NAKAI, S. OBARA and H. FUJII Improved Fatigue Properties with Maintaining Low Young’s Modulus Achieved in Biomedical Beta-Type Titanium Alloy by Oxygen Addition


H. LIU and H. FUJII Microstructural and Mechanical Properties of a Beta-Type Titanium Alloy Joint Fabricated by Friction Stir Welding


Y. F. YANG, H. IMAI, K. KONDOH and M. QIAN Enhanced Homogenization of Vanadium in Spark Plasma Sintering of Ti-10V-2Fe-3Al Alloy from Titanium and V-Fe-Al Master Alloy Powder Blends

J. Metall., Vol. 69, No. 4 (2017), pp. 663-668.

J. SHEN, X. CHEN, V. HAMMOND, L. J. KECSKES, S. N. MATHAUDHU, K. KONDOH and Q. WEI

The Effect of Rolling on the Microstructure and Compression Behavior of AA5083 Subjected to Large-Scale ECAE


A. BAHADOR, E. HAMZAH, K. KONDOH, T. A. A. BAKAR, F. YUSOF, H. IMAI, S. N. SAUD and M. K. IBRAHIM

Effect of Deformation on the Microstructure, Transformation Temperature and Superelasticity of Ti-23 At% Nb Shape-Memory Alloys

Mater. Des., Vol. 118 (2017), pp. 152-162.

K. KONDOH, R. IKEMASU, J. UMEDA, S. KARIYA and A. KHANTACHAWANA

Grain Refining Behavior of Powder Metallurgy Titanium Sintered Materials via Thermal Decomposition of Additive Oxide Particle (part 1)

Titanium, Vol. 65, No. 2 (2017), pp. 130-137 (in Japanese).

A. BAHADOR, E. HAMZAHA, K. KONDOH, T. ABUBAKARA, F. YUSOFC, S. N. SAUDD, M. K. IBRAHIMA and M. A. EZAZIC

Defocusing Effects of Laser Beam on the Weldability of Powder Metallurgy Ti-Based Shape Memory Alloys

Procedia Eng., Vol. 184 (2017), pp. 205-213.

K. KONDOH, R. IKEMASU, J. UMEDA, S. KARIYA and A. KHANTACHAWANA

Grain Refining Behavior of Powder Metallurgy Titanium Sintered Materials via Thermal Decomposition of Additive Oxide Particle (part 2)

Titanium, Vol. 65, No. 3 (2017), pp. 114-119 (in Japanese).

K. KONDOH and H. TANIGUCHI

Consolidation Behavior of Metal Powdercompaction J. Jpn. Soc. Technol. Plasiciy, Vol. 58, No. 678 (2017),

pp. 577-581 (in Japanese).

33

P. KHEMGLAD, J. KAJORNCHAIYAKUL, K. KONDOH and A. KHANTACHAWANA

Effect of Si Content on Mechanical Properties of Ti-Si-N Ternary Alloys Prepared by Spark Plasma Sintering

Key Eng. Mater., Vol. 751 (2017), pp. 14-18.

A. BAHADOR, E. HAMZAHA, K. KONDOH, Y. KAWAHITO, J. UMEDA and T. A. A. BAKARA

Mechanical and Superelastic Properties of Laser Welded Ti–Ni Shape-Memory Alloys Produced by Powder Metallurgy


X. ZHANG, S. LI, D. PAN, B. PAN and K. KONDOH

Microstructure and Synergistic-Strengthening Efficiency of CNTs-SiCp Dual-Nano Reinforcements in Aluminum Matrix Composites

Compos. Pt. A-Appl. Sci. Manuf., Vol. 105 (2018), pp. 87-96.

X. X. YE, H. IMAI, J. H. SHEN, B. CHEN, G. Q. HAN, J. UMEDA and K. KONDOH

Study of Twinning Behavior of Powder Metallurgy Ti-Si Alloy by Interrupted In-Situ Tensile Tests


B. CHEN, J. SHEN, X. YE, H. IMAI, J. UMEDA, M. TAKAHASHI and K. KONDOH

Solid-state Interfacial Reaction and Load Transfer Efficiency in Carbon Nanotubes (CNTs)-reinforced Aluminum Matrix Composites

Carbon, Vol. 114 (2017), pp. 198-208.

X. X. YE, H. IMAI, J. H. SHEN, B. CHEN, G. Q. HAN, J. UMEDA, M. TAKAHASHI and K. KONDOH

Dynamic Recrystallization Behavior and Strengthening-Toughening Effects in a Near-Α Ti-xSi Alloy Processed by Hot Extrusion


J. SHEN, B. CHEN, X. YE, H. IMAI, J. UMEDA and K. KONDOH

The Formation of Bimodal Multilayered Grain Structure and Its Effect on the Mechanical Properties of Powder Metallurgy Pure Titanium

Mater. Des., Vol. 116 (2017), pp. 99-108.

X. X. YE, B. CHEN, J. H. SHEN, J. UMEDA and K. KONDOH Microstructure and Strengthening Mechanism of Ultrastrong and Ductile Ti-xSn Alloy Processed by Powder Metallurgy


B. CHEN, H. IMAI, J. UMEDA, M. TAKAHASHI and K. KONDOH

Effect of Spark-Plasma-Sintering Conditions on Tensile Properties of Aluminum Matrix Composites Reinforced with Multiwalled Carbon Nanotubes (MWCNTs)

JOM, Vol. 69, No. 4 (2017), pp. 669-675.

Y. YAMABE, J. UMEDA, H. IMAI and K. KONDOH Tribological Property of Α-Titanium Strengthened by Nitrogen Solid-Solution

J. Jpn. Soc. Powder Powder Metal., Vol. 64, No. 6 (2017), pp. 275-280 (in Japanese).

J. FUJITA, J. UMEDA and K. KONDOH Synthesis of Al2Ca Dispersoids by Powder Metallurgy Using a Mg-Al Alloy and CaO Particles

Materials, Vol. 10, No. 7 (2017), pp. 716.

Y. MORIWAKI, M. SUTO, J. UMEDA and Y. MICHIURA Utilization of Bio-Silica Materials as Concrete Admixture

J. Jpn. Concrete, Vol. 37, No. 1 (2017), pp. 145-150 (in Japanese).

B. CHEN, S. K. MOON, X. YAO, G. BI, J. SHEN, J. UMEDA and K. KONDOH

Strength and Strain Hardening of a Selective Laser Melted AlSi10Mg Alloy

Scr. Mater., Vol. 141 (2017), pp. 45-49.

J. FUJITA, J. UMEDA and K. KONDOH Investigation of Strengthening Mechanism of

Oxide-Dispersed Magnesium Composite Sintered Material at Elevated Temperature


B. CHEN, J. SHEN, X. YE, J. UMEDA and K. KONDOH

Advanced Mechanical Properties of Powder Metallurgy Commercially Pure Titanium with a High Oxygen Concentration

J. Mater. Res., Vol. 32, No. 19 (2017), pp. 3769-3776.

J. UMEDA, T. MIMOTO, H. IMAI and K. KONDOH

Powder Forming Process from Machined Titanium Chips via Heat Treatment in Hydrogen Atmosphere

Mater. Trans., Vol. 58, No. 12 (2017), pp. 1702-1707.

34

B. CHEN, J. SHEN, X. YE, L. JIA, S. LI, J. UMEDA, M. TAKAHASHI and K. KONDOH

Length Effect of Carbon Nanotubes on the Strengthening Mechanisms in Metal Matrix Composites

Acta. Mater., Vol. 140 (2017), pp. 317-325.

R. SOBA, Y. TANABE, T. YONEZAWA, J. UMEDA and K. KONDOH

Microstructures and Mechanical Properties of Shape Memory Alloy Using Pre-Mixed TiNi Powders with TiO2 Particles


N. MA, A. ELSAYED and K. KONDOH

Measurement of Anisotropic Work-Hardening Properties and Deformation Behavior Analysis of Extruded Magnesium Alloys Using Rapidly Solidified Powders J. Jpn. Soc. Technol. Plasiciy, Vol. 58, No. 678

(2017), pp. 587-592 (in Japanese). H. Y. FU, T. NAGASAKA, T. TANAKA, A. SAGARA, H. SERIZAWA and Y. SATOU

Dissimilar-Metals Bonding Between NIFS-HEAT-2 Vanadium Alloy and Hastelloy X Nickel Alloy by Controlling Intermetallics

Fusion Sci. Technol., Vol. 72 (2017), pp. 680-685.

H. INOUE and T. KOSEKI Solidification Mechanism of Austenitic Stainless Steels Solidified with Primary Ferrite

Acta. Mater., Vol. 124 (2017), pp. 430-436.

H. INOUE Corrosion Behavior and Formation Mechanism of Microstructure in Weld Metals

Prod. Eng., Vol. 69, No. 4 (2017), pp. 53-56 (in Japanese).

D. WANG, K. KADOI and K. SHINOZAKI

Prediction of Residual Liquid Distribution of Austenitic Stainless Steel during Laser Beam Welding Using Multi-Phase Field Modeling

ISIJ Int., Vol. 57, No. 1 (2017), pp. 139-147.

S. YAMASHITA, K. SHINOZAKI, M. YAMAMOTO and K. KADOI

Relationship Between Grain Refinement in Weld Metal of Type 310S Stainless Steel and Welding Conditions and Mechanical Properties



Elucidation of Grain Refinement Mechanism in Weld Metal of Type 310S Stainless Steel



Effect of Wire Feeding Conditions on Grain Refinement in Weld Metal of Type 310S Stainless Steel



Effect of Heating Rate on Grain Refinement in Weld Metal of Type 430 Stainless Steel


K. KADOI, D. WANG and K. SHINOZAKI

Solidification Cracking Behavior during Laser Welding of Type 310s Stainless Steel Evaluated Using In-situ Observation Technique

Proc. 9th European Stainless Steel Conf., Vol. 34 (2017).

K. KADOI and K. SHINOZAKI Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal

Metall. Mater. Trans. A, Vol. 48, No. 12 (2017), pp. 5860-5869.

S. TOKITA, H. KOKAWA, Y. S. SATO and H. T. FUJII

In Situ EBSD Observation of Grain Boundary Character Distribution Evolution during Thermomechanical Process Used for Grain Boundary Engineering of 304 Austenitic Stainless Steel

Mater. Charact., Vol. 131 (2017), pp. 31-38.

I. Z. DINIC, L. T. MANCIC, M. RABANAL, K. YAMAMOTO, S. OHARA, S. TAMURA, K. TOMITA, A. M. L. M. COSTA, B. A. MARINKOVIC, I. M. DUGANDZIC and O. B. MILOSEVIC

Compositional and Structural Dependence of Up-Converting Rare Earth Fluorides Obtained through EDTA Assisted Hydro/solvothermal Synthesis

Adv. Powder Technol., Vol. 28, No. 1 (2017), pp. 73-82.

35

S. OHARA and K. YAMAMOTO Synthesis of Tailor-Made Ceramic Nanocrystals by Organic Ligand-Assisted Hydrothermal Method

J. Jpn. Soc. Powder and Powder Metallurgy, Vol. 64, No. 3 (2017), pp. 109-115 (in Japanese).

K. KOIKE, K. YAMAMOTO, S. OHARA, T. KIKITSU, K. OZASA, S. NAKAMURA, M. SUGIYAMA, Y. NAKANO and K. FUJII

Effect of NiO-Loading on n-Type GaN Photoanode for Photoelectrochemical Water Splitting Using Different Aqueous Electrolytes

Int. J. Hydrog. Energy, Vol. 42, No. 15 (2017), pp. 9493-9499.

M. HADANO, Y. MURAI, T. KOBASHI, K. UENO, K. KANNO, K. NAKATA and T. SUGA

Effect of Laser Brazing Condition on Dissimilar Lap Joint Formation of Stainless Steel and Titanium


[Mechanics, Strength & Structural Design]

S. YAMAGISHI, Y. MIKAMI, K. OTANI, N. HISADA, S. AOKI and M. MOCHIZUKI

Numerical Simulation of Relationship between Member Dimension and Weld-Induced Stress in Plate-Fin Type Heat Exchanger


T. KIZAKI, Y. MIKAMI, N. KAWABE, H. MATSUDA, R. IKEDA and M. MOCHIZUKI

Numerical Simulation of Hydrogen Diffusion and Accumulation Behavior under Residual Stress Distribution in Resistance Spot Welds


Y. MIKAMI, T. KAWABATA, T. TAGAWA, H. KITANO, A. KIUCHI, Y. KAYAMORI, S. KANNA, T. SAKURAI, Y. IMAI, M. OHATA, M. MOCHIZUKI, F. MINAMI, S. AIHARA and Y. HAGIHARA

Numerical Simulation of Residual Stress Modification by Reverse Bending of Notched Fracture Toughness Test Specimens of Multipass Welds

Theor. Appl. Fract. Mec., Vol. 92 (2017), pp. 214-222.

N. MA Review on Simulation Technology for Strength Evaluation Considering Metal Forming and Welding Effects

J. Jpn. Soc. Technol. Plasiciy, Vol. 58, No. 1 (2017), pp. 13-17 (in Japanese).

J. LIN, N. MA, Y. LEI and H. MURAKAWA

Measurement of Residual Stress in Arc Welded Lap Joints by Cosα X-ray Diffraction Method

J. Mater. Process Technol., No. 243 (2017), pp. 387-394.

N. GUO, X. YIN, J. LIANG and N. MA

Effects of Heat Input on Welding Buckling Distortion by Experimental Measurement Method

Sci. Technol. Weld. Joining, Vol. 22, No. 5 (2017), pp. 381-388.

N. MA, J. TATEISHI, S. HIROI, A. KUNUGI and H. HUANG

Fast Prediction of Welding Distortion of Large Structures Using Inherent Deformation Database and Comparison with Measurement


N. MA and H. HUANG

Efficient Simulation of Welding Distortion in Large Structures and Its Reduction by Jig Constraints, Journal of Materials Engineering and Performance

J. Mater. Eng. Perform., Vol. 26, No. 11 (2017), pp. 5206-5216.

N. MA and H. SERIZAWA Development of Computing Methods for Analysis of Joining-Induced Thermal Conduction, Residual Stress and Deformation in Thin Plates

J. Smart Process., (2017) (in Japanese).

L. LI, H. XIA, C. TANA and N. MA Effect of Groove Shape on Laser Welding-Brazing Al to Steel J. Mater. Process Technol., Vol. 253, No. 2 (2017),

pp. 573-581.

H. SERIZAWA and F. MIYASAKA New Combined Method of MPS and FEM Fro Simulating Friction Stir Processing

Ceramic Engineering and Science Proc., Vol. 38, No. 3 (2017), On-line.

36

H. Y. FU, T. NAGASAKA, M. YAMAZAKI, T. TOYAMA, W. H. GUAN, S. NOGAMI, H. SERIZAWA and H. TANIGAWA

Deformation of Dissimilar-Metals Joint between F82H and 316L in Impact Tests after Neutron Irradiation

Fusion Sci. Des., Vol. 124 (2017), pp. 1063-1067.

F. MINAMI, M. OHATA and Y. TAKASHIMA Revision of ISO 27306 for CTOD Toughness Correction for Constraint Loss

Mater. Sci. Forum, Vol. 879 (2017), pp. 54-59.

T. KAWABATA, T. TAGAWA, Y. KAYAMORI, M. OHATA, Y. YAMASHITA, M. KINEFUCHI, H. YOSHINARI, S. AIHARA, F. MINAMI, H. MIMURA and Y. HAGIGARA

Plastic Deformation Behavior in SEB Specimens with Various Crack Length to Width Ratios

Eng. Fract. Mech., Vol. 178 (2017), pp. 301-317.

T. KAWABATA, T. TAGAWA, Y. KAYAMORI, M. OHATA, Y. YAMASHITA, M. KINEFUCHI, H. YOSHINARI, S. AIHARA, F. MINAMI, H. MIMURA and Y. HAGIGARA

Applicability of New CTOD Calculation Formula to Various A0/W Conditions and B X B Configuration

Eng. Fract. Mech., Vol. 179 (2017), pp. 375-390.

K. INOSE, H. YAMAOKA, Y. NAKANISHI and F. MINAMI Toughness Assessments of Laser Arc-Hybrid Welds of Ultra High Strength Steel

Weld. World, Vol. 61, No. 5 (2017), pp. 955-961.

F. MINAMI

Strength and Fracture of Welded Joints Textbook for summer school of welding engineering, (2017), pp. 119-172 (in Japanese).

F. MINAMI, Y. TAKASHIMA, M. OHATA, Y. SHIMADA, T. SUZUKI, H. SHIMANUKI, S. IGI, T. ISHII, M. KINEFUCHI, T. YAMAGUCHI and Y. HAGIHARA

Fracture Assessment Procedure Developed in Japan for Steel Structures under Seismic Conditions

Eng. Fract. Mech., (2017). in Press.

Y. TAKASHIMA, T. HANDA and F. MINAMI Three-Dimensional Dynamic Explicit Finite Element Analysis of Charpy Impact Test

Mater. Sci. Forum, Vol. 879 (2017), pp. 1905-1910.

Y. TAKASHIMA, T. KAWABATA, S. YAMADA and F. MINAMI

Observation of Micro-Cracks Beneath Fracture Surface during Dynamic Crack Propagation

Int. Symp. on Notch Fracture, (2017), pp. 82-87.

Y. TAKASHIMA and F. MINAMI Probabilistic Model for Notch Toughness Evaluation in Ductile-To-Brittle Fracture Transition Temperature Range

Int. Symp. on Notch Fracture, (2017), pp. 237-242.

Y. ITO, Y. TAKASHIMA and F. MINAMI Strength Mismatch Effects on Charpy Absorbed Energy and CTOD Fracture Toughness


Y. TAKASHIMA and F. MINAMI

Influence of Impact Velocity on Transition Time for V-notched Charpy Specimen


M. HIROHATA, Y. TAKASHIMA and F. MINAMI

Characteristic of Charpy Absorbed Energy for Steel Bridge Member with Fire Damage


Y. TAKASHIMA, T. KAWABATA, S. YAMADA and F. MINAMI

Observation of Micro-Cracks Beneath Fracture Surface during Dynamic Crack Propagation

Theor. Appl. Fract. Mec., Vol. 92 (2017), pp. 178-184.

Y. ITO, Y. TAKASHIMA and F. MINAMI

Significance of Strength Mismatch Effect on Charpy Absorbed Energy in Welded Joints


S. TSUTSUMI, K. UEDA, T. SANO and Y. SAKINO

Numerical Study of Laser Peening Technique for Improving Fatigue Strength

J. Jpn. Soc. Civil Eng., Vol. 73, No. 2 (2017), pp. I_379-I_386 (in Japanese).

H. MOMII, S. TSUTSUMI and R. FINCATO

Ehhancement of Tangential Plasticity Theory for Cyclic Hardening and Softening Behavior under Non-Proportional High Cyclic Fatigue

J. Jpn. Soc. Civil Eng., Vol. 73, No. 2 (2017), pp. I_367-I_378 (in Japanese).

37

C. SHIGA, H. MURAKAWA, K. HIRAOKA, N. OSAWA, H. YAJIMA, T. TANINO, S. TSUTSUMI, T. FUKUI, H. SAWATO, K. KAMITA, T. MATSUZAKI, T. SUGIMURA, T. ASODA and K. HIROTA

Elongated-bead Weld Method for Improvement of Fatigue Properties in Welded Joints of Ship Hull Structures Using Low Transformation Temperature Welding Materials

Weld. World, (2017), pp. 1-20.

S. TSUTSUMI, K. MORITA and R. FINCATO Numerical Study on the Effect of Weld Bead Shape on the Fatigue Crack Initiation and Propagation Lives

J. Struct. Eng., Vol. 63A, No. 2 (2017), pp. 609-618 (in Japanese).

R. FINCATO and S. TSUTSUMI

Numerical Study of a Welded Plate Instability Using the Subloading Surface Model

Mar. Struct., Vol. 55 (2017), pp. 104-120.

T. SAKAI, R. FINCATO, S. TSUTSUMI, M. SANO, D. S. PAOLINO, T. MIYOSHI, N. OGUMA and A. NAKAGAWA

FEM Analyses of Stress Distributions around Inclusions at Interior Crack Initiation Site in Very High Cycle Fatigue

The Seventh Int. Conf. on Very High Cycle Fatigue(VHCF7), (2017), pp. 181-186.

T. SAKAI, N. OGUMA, A. NAKAGAWA, S. TSUTSUMI, O. NAIMARK and M. BANNIKOV

Formation Mechanism of Fine Granular Area (FGA) around Interior Inclusion at Crack Initiation Site in Very High Cycle Fatigue

The Seventh Int. Conf. on Very High Cycle Fatigue(VHCF7), (2017), pp. 57-62.

H. HUANG, S. TSUTSUMI, J. WANG, L. LI and H. MURAKAWA

High Performance Computation of Residual Stress and Distortion in Laser Welded 301L Stainless Sheets

Finite Elem. Anal. Des., Vol. 135C (2017), pp. 1-10.

T. HIRAIDE, S. IGI, T. TAGAWA, R. IKEDA and S. TSUTSUMI

Simulation of Fatigue Crack Initiation in Heat Affected Zone Microstructure Using Crystal-Plasticity Finite Element Method

Proc. ASME 2017 Pressure Vessels & Piping Division, Vol. PVP2017-65947 (2017), pp. 1-7.

R. FINCATO and S. TSUTSUMI Closest-point Projection Method for the Extended Subloading Surface Model

Acta Mechanica., Vol. 228, No. 12 (2017), pp. 4213-4233.

R. FINCATO and S. TSUTSUMI Effect of the Loading Path on the Ductile Damage Evolution

31st Asian-Pacific Technical Exchange and Advisory Meeting on Marine Structures, (2017), pp. 1-8.

S. TSUTSUMI, R. NAGAO, K. UEDA and R. FINCATO

Numerical and Experimental Investigation on Fatigue Life Extension Mechanism of Weld Joint by Hammer Peening


S. TSUTSUMI, M. SANO and R. FINCATO

Prediction of Fatigue Crack Initiation Life of Aluminum Alloy Joints Using Cyclic Elasto-Plasticity FEM Analysis


S. TSUTSUMI, T. KITAMURA and R. FINCATO

A Cyclic Plasticity Model for Carbon Steels Considering Stress Triaxiality and Lode Angle Effect


T. NAKAGOMI, H. KANEKO, S. TSUTSUMI, K. MASUDA, J. MAKISHIMA and R. HORIBA

Study of Influence of Beam-End Joint Details with Field Welding on Deformation Capacity of Pre-Build-Up H-shape Beam-To-Column Joint

J. Struct. Constr. Eng. AIJ, Vol. 82, No. 739 (2017), pp. 1497-1506 (in Japanese).

R. FINCATO and S. TSUTSUMI

A Return Mapping Algorithm for Elastoplastic and Ductile Damage Constitutive Equations Using the Subloading Surface Method

Int. J. Numer. Methods Eng., Vol. 2017 (2017), pp. 1-26.

38

S. TSUTSUMI, K. UEDA, R. FINCATO and T. SANO Dynamic Thermo-Elasto-Plasticity FE Analysis on Nano- and Femto-second Laser Shock Peenings for a Ferrite Material


Y. SHINTAKU, K. TERADA and S. TSUTSUMI

Anisotropic Damage Constitutive Law for Cleavage Failure in Crystalline Grain by Cohesive Zone Model


S. TSUTSUMI, R. NAGAO, R. FINCATO, T. ISHIKAWA and R. MATSUMOTO

Numerical and Experimental Study on Fatigue Life Extension of U-rib Steel Structure by Hammer Peening


S. KAWAI, M. SHINDOU, K. YAMAMOTO, T. NAGAI, H. TAKEDA, T. NAKANO, S. OKANO, M. MOCHIZUKI and T. SUGA

Internal Residual Stress Measurement by Modified Deep Hole Drilling Technique

70th Annual Assembly of Int. Inst. Welding (IIW), (2017), IIW Doc. XII-2310-17.

T. NAGAI, S. KAWAI, M. SHINDO, S. OKANO, M. MOCHIZUKI and T. SUGA

Comparative Study on Internal Residual Stresses in Electron Beam Welds

ISIJ Int., Vol. 57, No. 6 (2017), pp. 1072-1079. [General Welding]

Editorial Members

Chairman ······························· ITO Kazuhiro

TSUKAMOTO Masahiro

MA Ninshu

KIRIHARA Soshu

KOHAMA Kazuyuki

Published by Joining and Welding Research Institute, Osaka University

Printed by SEIEI Printing Co., Ltd. 2-10-33, GAMO, Joto-ku, OSAKA

[This article is not for sale.]

,

Transactions of JWRI, Vol. 46, 2017CONTENTS

RESEARCH ACTIVITIES OF JWRI

Experimental Investigation on Weld Pool Formation Process in Plasma Keyhole Arc Welding .................................. 1

Development of a Non-equilibrium 60 MHz Plasma Jet with a Long Discharge Plume .............................................. 2

Suppression of Dilution in Ni-Cr-Si-B Alloy Cladding Layer by Controlling Diode Laser Beam Profile ................... 3

A New Process for Design and Manufacture of Tailor-made Functionally Graded Composites through Friction Stir Additive Manufacturing............................................................................................................................. 4

Clarification of Microstructure Evolution of Aluminum during Friction Stir Welding using Liquid CO2 Rapid Cooling ................................................................................................................................................................ 5

Length Effect of Carbon Nanotubes on the Strengthening Mechanisms in Metal Matrix Composites ........................ 6

Observation of Micro-cracks beneath Fracture Surface during Dynamic Crack Propagation ...................................... 8

Closest-point Projection Method for the Extended Subloading Surface Model............................................................ 9

Effect of Chemical Composition on Susceptibility to Weld Solidification Cracking in Austenitic Weld Metal......... 10

Effect of BaF2 Powder Addition on the Synthesis of YAG Phosphor by Mechanical Method.................................... 11

Ultraviolet Laser Stereolithography of Alumina Lattice with a Diamond Pattern ...................................................... 12

Thermal Stability of Low-temperature Sintered Joint using Sn-coated Cu Particles during Isothermal

Spherical Porous Granules in MgO-Fe2O3-Nb2O5 System: In situ Observation of Formation Behavior using High-temperature Confocal Laser-scanning Microscopy .................................................................................. 14

Development of Bead Shape Measurement Technology for Pipe Welds .................................................................... 15

Effects of NiO-loading on n-type GaN Photoanode for Photoelectrochemical Water Splitting using Different Aqueous Electrolyte..................................................................................................................................................... 16

Activity Report on “The Project to Create Research and Educational Hubs for Innovative

Resistance Spot Welding of Metal/carbon-fiber-reinforced Plastics and Applying Silane Coupling Treatment ........ 18

Solid-state Microjoining Mechanisms of Wire Bonding and Flip Chip Bonding ....................................................... 19

Study on Control of Cathode Spot Behavior in Arc Welding ...................................................................................... 20

Surface Morphology of Ti-6Al-4V Plate Fabricated by Vacuum Selective Laser Melting ......................................... 21

Dissimilar spot welding of three lapped sheets of aluminum alloy and steels by metal flow-Application of Friction Anchor Welding to three lapped sheets of aluminum alloy and steels- ................................ 22

Anisotropic Damage Constitutive Law for Cleavage Failure in Crystalline Grain by Cohesive Zone Model ........... 23

CONTRIBUTIONS TO OTHER ORGANIZATIONS .......................................................................................... 24

transactions of jwri · 2018. 4. 27. · professor dr. fujii hidetoshi specially appointed...

Documents