文献类型：期刊文献

英文题名：Creep-fatigue deformation characteristics and life prediction model of Inconel 718 superalloy under hybrid stress-strain-controlled mode

作者：Kang, Zitong[1,2];Wang, Xiaowei[1,2,5];Zhou, Weitao[1,2];Zhang, Tianyu[1,2];Zhou, Dewen[1,2];Zhao, Yuchen[3];Wen, Jianfeng[2,4];Gong, Jianming[1,2,5]

机构：[1]Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing, Peoples R China;[2]Nanjing Tech Univ, Inst Reliabil Ctr Mfg IRcM, Nanjing, Peoples R China;[3]China United Heavy Duty Gas Turbine Technol Co Ltd, Beijing, Peoples R China;[4]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai, Peoples R China;[5]Nanjing Tech Univ, Inst Reliabil Ctr Mfg IRcM, Nanjing 211816, Peoples R China

年份：2024

卷号：47

期号：6

起止页码：2251

外文期刊名：FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES

收录：;EI(收录号：20241415846502);WOS:【SCI-EXPANDED(收录号:WOS:001190393900001)】；

基金：The authors gratefully acknowledge the financial support of the Key Support Project of the National Key R&D Program of China (2022YFF0605600), National Natural Science Foundation of China (U21B2077, 51905261, 52122506, and 52375149), and China Postdoctoral Science Foundation (2023M741667).

语种：英文

外文关键词：continuum damage mechanics; creep-fatigue interaction; cyclic responses; hybrid stress- and strain-controlled creep-fatigue interaction loading; life prediction

摘要：In this paper, the creep-fatigue responses of the nickel-based superalloy Inconel 718 have been investigated by conducting hybrid stress-strain-controlled creep-fatigue interaction (HCFI) loading experiments at 650 degrees C with different dwell stresses and dwell periods. Deformation responses demonstrate that stress dwell leads to complex cyclic responses, such as an increase in softening rate and changes in inelastic strain rate. Then, a novel creep equivalent stress determination method is proposed based on stress relaxed characteristics. After modifying the continuum damage mechanics (CDM) model with this method, accurate prediction results of the creep-fatigue cyclic life under strain-controlled creep-fatigue loading and HCFI loading can be obtained. Finally, the damage evolutions of Inconel 718 under HCFI loading are analyzed by CDM model. The results of damage evolution indicate that the trend of damage accumulation under different test conditions is consistent with the trend of inelastic strain in the material. The creep-fatigue responses of Inconel 718 under HCFI loading are investigated. A creep equivalent stress determination method based on stress relaxation is proposed. Accurate life prediction results obtained under various loadings at high temperature.