J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (8): 695-704.DOI: 10.1016/j.jmst.2016.02.014
Special Issue: 2016-2017材料模拟与计算专辑
• Orginal Article • Next Articles
Wen Jian-Feng1,2,Tu Shan-Tung1,*(),Xuan Fu-Zhen1,Zhang Xue-Wei1,Gao Xin-Lin3
Received:
2016-01-06
Accepted:
2016-02-03
Online:
2016-08-10
Published:
2016-10-10
Contact:
Tu Shan-Tung
Wen Jian-Feng,Tu Shan-Tung,Xuan Fu-Zhen,Zhang Xue-Wei,Gao Xin-Lin. Effects of Stress Level and Stress State on Creep Ductility: Evaluation of Different Models[J]. J. Mater. Sci. Technol., 2016, 32(8): 695-704.
Fig. 1. Comparison of creep damages calculated by life fraction rule and ductility exhaustion concept in calculating damages for 316H stainless steel at 570?°C (linear interaction, /3 and ×3 denote ωc+ωf=1, 1/3 and 3, respectively): (a) creep-fatigue interaction diagram; (b) total damage vs stress dwell (adapted from Reference [7]).
Value of α for 316 stainless steel | Reference |
---|---|
0.75 | [ |
0.48 | [ |
0.1-0.2 | [ |
Table 1. Material constant α for 316 stainless steel
Value of α for 316 stainless steel | Reference |
---|---|
0.75 | [ |
0.48 | [ |
0.1-0.2 | [ |
Fig. 2. Micrograph of creep cavities at grain boundaries: (a) steady-state growth of cavities in Inconel 718 alloy at 650?°C[38]; (b) interlinkage of cavities in Waspaloy alloy at 700?°C[39].
Fig. 4. Effect of strain rate on rupture ductility: (a) schematic representation of regimes (adapted from Reference[47]); (b) Regime-I: viscoplastic cavity growth; (c) Regime-II: diffusion controlled cavity growth; (d) Regime-III: constrained diffusion cavity growth.
Fig. 5. Variation of creep ductility (in terms of axial displacement) against normalized stress for 316H at 550-700?°C (adapted from References [64] and [65]).
Fig. 6. Variation of creep ductility (in terms of reduction in area) against normalized stress at 500-700?°C (adapted from Reference [71]): (a) T92 and P92; (b) T122 and P122; (c) T91 and Gr.91.
Fig. 10. Illustration of the effect of stress state on void growth and ductility (Δluni and Δltri denote the elongation of the matrix under uniaxial and triaxial stress state, respectively).
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