文献类型：期刊文献

英文题名：Cyclic response and residual life prediction of Inconel 718 superalloy after overloading under hybrid stress-strain controlled creep-fatigue loading

作者：Kang, Zitong[1,2];Wang, Xiaowei[1,2];Wang, Zhiwei[1,2];Zhou, Dewen[1,2];Zhang, Tianyu[1,2];Wen, Jianfeng[2,3];Zhang, Chengcheng[4];Tang, Jianqun[1,2];Gong, Jianming[1,2]

机构：[1]Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Peoples R China;[2]Nanjing Tech Univ, Inst Reliabil Ctr Mfg IRCM, Nanjing 211816, Peoples R China;[3]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[4]AECC Commercial Aircraft Engine Co Ltd, Shanghai Engn Res Ctr Commercial Aircraft Engine, Shanghai 201108, Peoples R China

年份：2024

卷号：162

外文期刊名：ENGINEERING FAILURE ANALYSIS

收录：;EI(收录号：20242116117161);WOS:【SCI-EXPANDED(收录号:WOS:001242923800002)】；

基金：Data availability The data that has been used is confidential. Acknowledgments The authors gratefully acknowledge the financial support of the National Key R & D Program of China (No.2022YFF0605600) , National Natural Science Foundation of China (Nos. 52375149, 52122506, U21B2077) .

语种：英文

外文关键词：Creep-fatigue interaction; Overloading; Residual life prediction; Cyclic response; Fractographic observation

摘要：Inconel 718 is a material for manufacturing turbine disks, which is subjected to complex loads of creep-fatigue during service. This paper examines the effect of constant stress overloading at various lifespan stages on subsequent cyclic deformation, fracture behavior, and residual lifetime in hybrid stress and strain-controlled creep-fatigue interaction (HCFI) experiments conducted at 650degree celsius. Overloading of 800 MPa constant stress with 180 min dwell time is applied at the 10 %, 25 %, 50 %, 65 %, and 70 % lifespan of HCFI tests. Results show that overloading reduces the residual life of the material obviously and makes a significant impact on the subsequent creepfatigue deformation behavior, and additional damage is induced when overloading is applied towards the end of the lifespan. Moreover, more severe grain boundary damage leading to the final intergranular fracture is identified through microstructural analysis following overloading. Finally, equivalent damage is proposed to quantify the creep-fatigue damage affected by overloading, resulting in accurate life prediction outcomes.