A study of the back stress and the friction stress behaviors of Ti-6Al-4V alloy during low cycle fatigue at room temperature

被引：75
作者：
Xu, Haifeng [1 ]
Ye, Duyi [1 ]
Mei, Linbo [2 ]
机构：
[1] Zhejiang Univ, Coll Energy Engn, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China
[2] Shanghai Turbine Plant, Dev Technol Dept, 333 Jiang Chuan Rd, Shanghai 200240, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 700卷
基金：
中国国家自然科学基金;
关键词：
Low cycle fatigue; Ti-6Al-4V alloy; Cyclic behavior; Back stress; Friction stress; DEFORMATION-BEHAVIOR; TITANIUM-ALLOY; STRAIN; MICROMECHANISMS; SUPERALLOY; STEEL;
D O I：
10.1016/j.msea.2017.06.051
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Low cycle fatigue (LCF) tests were performed on Ti-6Al-4V alloy at room temperature. The fatigue hardening/softening of the Ti-alloy were determined. Both the back stress (X) and the friction stress (as) were evaluated from analysis of fatigue hysteresis loops and their cycle-dependent behaviors during fatigue tests were obtained experimentally. It is shown that the cyclic stress response or the fatigue hardening/softening of the Ti-alloy actually results from the competition effect of the back and the friction stress behaviors during fatigue cycling. A two-slope behavior in both the epsilon(pa)-2N(f) and the X-2N(f) plots was also obtained. The micro-mechanisms associated with the back and friction stress behaviors as well as the two-slope behavior in the epsilon(pa)-2N(f) and X-2N(f) plots were further discussed with the help of OM and TEM observations of fatigue failure specimens at representative strain amplitudes. In this study, the DIC technique was also introduced to characterize quantitatively the cyclic deformation heterogeneity of the Ti-alloy at the grain scale.
引用
收藏
页码：530 / 539
页数：10
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