文献类型：期刊文献

英文题名：Fatigue-induced evolution of nanograins and residual stress in the nanostructured surface layer of Ti-6Al-4V

作者：Jia, Yun-Fei[1];Liu, Yi-Xin[1];Huang, Jie[1];Fu, Yao[1];Zhang, Xian-Cheng[1];Xin, Yun-Chang[2];Tu, Shan-Tung[1];Mao, Miao-Dong[1];Yang, Fuqian[3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, MOE, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China;[2]Chongqing Univ, Coll Mat Sci & Engn, Int Joint Lab Light Alloys, Chongqing 400030, Peoples R China;[3]Univ Kentucky, Dept Chem & Mat Engn, Mat Program, Lexington, KY 40506 USA

年份：2019

卷号：764

外文期刊名：MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

收录：;EI(收录号：20193007239445);WOS:【SCI-EXPANDED(收录号:WOS:000486360100012)】；

基金：STT and XCZ are grateful for the support from National Natural Science Foundation of China of China (51725503, 51605164, 51575183) and the 111 project. XCZ is also grateful for the support through Shanghai Technology Innovation Program of SHEITC (CXY-2015-001), Fok Ying Tung Education Foundation, and Young Program of Yangtze River Scholars. YFJ is also grateful for the support through Shanghai Sailing Program (16YF1402300) and Shanghai Chenguang Program (16CG34).

语种：英文

外文关键词：Nano-grain; Residual stress; Grain coarsening; Fatigue

摘要：Using ultrasonic deep rolling process, we have formed a surface layer of nanograins in Ti-6Al-4V alloy. The effect of fatigue deformation under uniaxial loading on the evolution of average grain size and Tresca stress in the surface layer of nanograins is studied. Increasing the strain amplitude of the uniaxial fatigue test increases the relaxation rate of the Tresca stress and the growth rate of the nanograins. A simple relation between the grain coarsening of the nanograins and the cycle number is used to describe the fatigue-induced grain growth of the nanograins in the surface layer. There exists strain-assisted grain growth of the nanograins, which is driven by strain energy and associated with the relaxation of residual stress. The rate of the grain growth can be approximately expressed as an exponential function of the strain amplitude.