文献类型：期刊文献

英文题名：Creep-fatigue life prediction in nickel-based superalloy GH4169 based on microstructural damage quantification with the help of electron backscatter diffraction

作者：Wang, Run-Zi[1];Chen, Hao[1];Zhang, Yang[2];Zhang, Xian-Cheng[1];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Nanchang Inst Technol, Energy & Environm Engn Inst, Nanchang 330013, Jiangxi, Peoples R China

年份：2020

卷号：195

外文期刊名：MATERIALS & DESIGN

收录：;EI(收录号：20203108995739);WOS:【SCI-EXPANDED(收录号:WOS:000576530000004)】；

基金：The authors would like to acknowledge gratefully for the financial support through National Natural Science Foundations of China (51725503, 11872181) and the 111 project. The author X.C. Zhang is also grateful for the support by Shanghai Technology Innovation Program of SHEITC (CXY-2015-001), Fok Ying Tung Education Foundation, and Young Program of Yangtze River Scholars.

语种：英文

外文关键词：Creep-fatigue; Damage mechanism; Unified viscoplastic model; Interaction diagram; Life assessment

摘要：A series of strain-controlled creep-fatigue tests under different loading waveforms are carried out on GH4169 superalloy at 650 degrees C. In the macroscopic view, a unified viscoplastic constitutive framework is used to describe cyclic deformation process. Particularly, a modified kinematic hardening rule considering loading-dependent effect is developed to simulate the stress relaxation behavior during hold periods. Then, creep-fatigue assessment based on interaction diagram is quantitatively determined by the strain energy density exhaustion (SEDE) approach. In order to elucidate damage mechanisms under various loading conditions, the characterization of damage mechanism is observed from the post-test examination. Main-crack-failure modes from fracture appearance observations and cracking modes from longitudinal sections are studied via scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD), respectively. Furthermore, image-based creep-fatigue diagram is proposed based on metallographic interpretation of mechanisms. (c) 2020 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).