文献类型：期刊文献

英文题名：The creep-fatigue behavior of a nickel-based superalloy: Experiments study and cyclic plastic analysis

作者：Sun, Li[1];Bao, Xiao-Guang[1];Guo, Su-Juan[1];Wang, Run-Zi[1];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Minist Educ, Key Lab Pressure Syst & Safety, Shanghai 200237, Peoples R China

年份：2021

卷号：147

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20210909988983);WOS:【SCI-EXPANDED(收录号:WOS:000635550300002)】；

基金：The authors would like to acknowledge gratefully for the financial support through National Natural Science Foundations of China (11872181, 51725503, 52005185) and the 111 project. The author X.C. Zhang is also grateful for the support by Shanghai Technology Innovation Program of SHEITC (CXY2015001) , Fok Ying Tung Education Foundation, and Young Program of Yangtze River Scholars. The author S.J. Guo is also grateful for the Shanghai Natural Science Foundation (18ZR1408900) and Shanghai Pujiang Program (2019PJD009) .

语种：英文

外文关键词：Creep-fatigue; Cyclic softening; Stress relaxation; Back stress; Isotropic stress

摘要：Cyclic behavior of a nickel-based GH4169 superalloy under fully-reversed and asymmetric creep-fatigue tests with strain-controlled is investigated at 650?. Significant tension?compression asymmetry and continuous cyclic softening are observed for all loading waveforms. The material exhibits mean stress relaxation under asymmetric loading and fully-reversed loading with valley strain dwells. Moreover, stress relaxation behavior during the dwell period is almost independent of the number of cycles. In order to identify the deformation mechanism, the evolutions of mean value and amplitude of the internal stress (back stress and effective stress) based on the partition of hysteresis loops are analyzed. Results show that both the cyclic softening and mean stress relaxation are primarily dominated by the evolution of back stress and secondarily affected by that of effective stress. Such findings lay a solid foundation for further investigations of reasonable cyclic deformation description and accurate life prediction in GH4169 alloy under creep-fatigue loadings.