文献类型：期刊文献

英文题名：Cyclic deformation response of austenitic Ni-based alloy: Mechanical behavior, internal stress evolution and microstructural feature

作者：Wang, Ning[1];Yu, Hao[1];Zhao, Peng[1];Zhang, Jia-Min[1];Gong, Jian-Guo[1];Xuan, Fu-Zhen[1]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, MOE, Shanghai 200237, Peoples R China

年份：2022

卷号：850

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

收录：;EI(收录号：20222812344017);WOS:【SCI-EXPANDED(收录号:WOS:000840722500002)】；

基金：Supported by Natural Science Foundation of Shanghai (Grant Nos.: 20ZR1415300 and 21ZR1418200).

语种：英文

外文关键词：Cyclic deformation; Internal stresses; Dislocation structure; Dynamic strain ageing; Austenitic Ni-Based alloy

摘要：Cyclic deformation response of an austenitic Ni-based alloy was investigated by symmetrical/asymmetrical strain cycling tests at room temperature (RT) and 350 degrees C. The effects of strain amplitude/ratio and ambient temperature on the cyclic deformation behavior were discussed in terms of microstructural features and internal stresses. Results indicate that the cyclic hardening/softening at RT is mainly attributed to the increase/decrease in back stress. Whilst at 350 degrees C, the contribution of effective stress to cyclic deformation response becomes important due to the planar slip promoted by the occurrence of dynamic strain aging (DSA) throughout the fatigue process. Accordingly, the continuous cyclic hardening at 350 degrees C comes from the combined action of back stress and effective stress.