chapter 7 high temperature deformation of crystalline materials-2
DESCRIPTION
Chapter 7 High temperature deformation of crystalline materials-2. Primary creep, Stage I, is a period of decreasing creep rate. Primary creep is a period of primarily transient creep. During this period deformation takes place and the resistance to creep increases until stage II. - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/1.jpg)
Chapter 7 High temperature deformation of crystalline materials-2
![Page 2: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/2.jpg)
![Page 3: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/3.jpg)
![Page 4: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/4.jpg)
Primary creep, Stage I, is a period of decreasing creep rate. Primary creep is a period of primarily transient creep. During this period deformation takes place and the resistance to creep increases until stage II. Secondary creep, Stage II, is a period of roughly constant creep rate. Stage II is referred to as steady state creep. Tertiary creep, Stage III, occurs when there is a reduction in cross sectional area due to necking or effective reduction in area due to internal void formation.
The following stages are observed:1. The incubation deformation. 2. The primary stage. The creep rate decreases when the strain increases.3. The steady-state strain. The plastic strain rate is a constant value. ε˙ = const.4. The tertiary stage. The tertiary creep leads to a rupture.
![Page 5: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/5.jpg)
![Page 6: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/6.jpg)
![Page 7: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/7.jpg)
![Page 8: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/8.jpg)
![Page 9: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/9.jpg)
![Page 10: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/10.jpg)
![Page 11: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/11.jpg)
![Page 12: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/12.jpg)
![Page 13: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/13.jpg)
![Page 14: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/14.jpg)
![Page 15: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/15.jpg)
![Page 16: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/16.jpg)
![Page 17: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/17.jpg)
![Page 18: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/18.jpg)
![Page 19: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/19.jpg)
![Page 20: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/20.jpg)
![Page 21: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/21.jpg)
![Page 22: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/22.jpg)
![Page 23: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/23.jpg)
![Page 24: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/24.jpg)
![Page 26: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/26.jpg)
Low-temperature plasticity limited by a lattice resistance. The strain-rate is determined by the kinetics of kink nucleation and propagation.
Low-temperature plasticity limited by discrete obstacles. The strain-rate is determined by the kinetics of obstacle cutting.
![Page 27: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/27.jpg)
Diffusional flow by diffusional transport through and round the grains. The strain-rate may be limited by the rate of diffusion or by that of an interface reaction.
![Page 28: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/28.jpg)
![Page 29: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/29.jpg)
![Page 30: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/30.jpg)
![Page 31: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/31.jpg)
![Page 32: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/32.jpg)
![Page 33: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/33.jpg)
![Page 34: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/34.jpg)
![Page 35: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/35.jpg)
Power-law creep involving cell-formation by climb. Power-law creep limited by glide processes alone is also possible.
![Page 36: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/36.jpg)
![Page 37: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/37.jpg)
![Page 38: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/38.jpg)
![Page 39: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/39.jpg)
![Page 40: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/40.jpg)
![Page 41: Chapter 7 High temperature deformation of crystalline materials-2](https://reader035.vdocument.in/reader035/viewer/2022062300/56812c68550346895d90fdfc/html5/thumbnails/41.jpg)