novel ultra-high straining process for bulk materials— development of the accumulative...
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Novel Ultra-High Straining Process for Bulk Materials—Development of the Accumulative Roll-Bonding (ARB) Process
Authored by Y. Saito, H. Utsunomiya, N. Tsuji, T. Sakai
Presented by Chris ReeveSeptember 13, 2004
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Outline
Introduction Model Design Application Experimental Procedure Results Conclusion Questions
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Introduction Why is Accumulative Roll-Bonding
important? Ultra-fine grain materials exhibit
desirable properties High strength at ambient temperatures High-speed superplastic deformation at
elevated temperatures High corrosion resistance
Commonly accomplished by intense plastic straining
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Introduction Processes used such as cyclic
extrusion compression have two main drawbacks Requires large load capabilities,
expensive dies Low production rate limits economic
viability Function of paper is to introduce
Accumulative Roll-Bonding (ARB) as a bulk manufacturing process
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Introduction References:
1. Richert, J. and Richert, M., Aluminum, 1986, 62, 604 2. Valiev, R. Z., Krasilnikov, N. A. and Tsenev, N. K., Mater. Sci.
Engng, 1991, A137, 35. 3. Horita, Z., Smith, D. J., Furukawa, M., Nemoto, M., Valiev, R. Z.
and Langdon, T. G., J. Mater. Res., 1996, 11, 1880. 4. Saito, Y., Utsunomiya, H., Tsuji, N. and Sakai, T., Japanese Patent
applied for. 5. Nicholas, M. G. and Milner, D. R., Br. Weld. J., 1961, 8, 375. 6. Helmi, A. and Alexander, J.M., J. Iron Steel Inst., 1968, 206, 1110. 7. Metals Handbook, 9th edn, Vol. 2. American Society for Metals,
Metals Park, OH, 1979, pp. 65-66. 8. Sakai, T., Saito, Y., Hirano, K. and Kato, K., Trans. ISIJ, 1988, 28,
1028. 9. Saito, Y., Tsuji, N., Utsunomiya, H., Sakai, T. and Hong, R. G.,
Scripta mater., 1998, 39, 1221. 10. Tylecote, R. F., The Solid Phase Welding of Metals. Edward
Arnold, London, 1968.
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Model Principle
Rolling bond surfaces together Refines microstructure Improves properties.
Iterative process Process design steps
Surface treatment Stacking Roll bonding (heating) Cutting
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Model Important parameters: t, tn, n, ε, rt
For reduction of 50% in a pass Thickness after n cycles
t = t0 / 2n
Total reduction after n cycles rt = 1 – t / t0 = 1 – 1 / 2n
Equivalent plastic strain
nn 80.0)}2
1ln(3
2{
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Design Application
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Experimental Procedure No “special” equipment needed! Three alloys chosen
Al 1100 (commercially pure) Al 5083 (Al-Mg alloy) Ti-added interstitial free (IF) steel
Surfaces degreased, brushed Strips were heated 50 % reduction rolling under dry
conditions
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Experimental Procedure
Material Heating Roll Diameter (mm)
Roll speed (m/min)
Mean Strain Rate (/s)
Al (1100)
473 K x 5 min
225 10 12
Al (5083)
473 K x 5 min
310 43 46
IF Steel 773 K x 5 min
310 43 46
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Results
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Results
Expected that grain refinement: Improves mechanical properties
related to strength Decreased % elongation in direction
of roll-bonding The number of cycles required to
obtain peak strength can only be determined experimentally
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ResultsMaterial # Cycles TS (MPa) %
Elongation
Al (1100) 0 (Initial) 84 42
Al (1100) 8 304 8
Al-Mg (5083) 0 (Initial) 319 25
Al-Mg (5083) 7 551 6
IF Steel 0 (Initial) 274 57
IF Steel 5 751 6
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Conclusions
Practical industrial use for high strength structural applications
Advances rolling technology by application to a specific materials processing method
Industries most impacted: construction, marine, aerospace, automotive
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Questions???