文献类型：期刊文献

英文题名：Failure mechanism and life correlation of Inconel 718 in high and very high cycle fatigue regimes

作者：Yang, Yi-Fan[1];Hu, Hua-Yan[2];Min, Lin[1];Sun, Qian-Tao[1];Song, Miao[2];Zhu, Ming-Liang[1];Wen, Jian-Feng[1,3];Tu, Shan-Tung[1,3]

机构：[1]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Shanghai Jiao Tong Univ, Sch Nucl Sci & Engn, Shanghai 200240, Peoples R China;[3]Shanghai Inst Aircraft Mech & Control, Shanghai 200092, Peoples R China

年份：2023

卷号：175

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20232514282026);WOS:【SCI-EXPANDED(收录号:WOS:001024478600001)】；

基金：Financial supports from the National Science and Technology Major Project (J2019 -IV -0010-0078) , National Natural Science Foundation of China (52122506 and 51875203) , Shanghai Gaofeng Project for University Academic Program Development and the Program of Oriental Scholars of Shanghai Universities are gratefully acknowledged.

语种：英文

外文关键词：Inconel 718; Very high cycle fatigue; Fatigue crack initiation; Transmission electron microscopy; Fatigue life

摘要：High and very high cycle fatigue (HCF and VHCF) behaviours and failure mechanism of Inconel 718 were investigated via ultrasonic fatigue tests and microscopic characterization techniques. It is shown that the S-N curve continuously decreases in the HCF regime, while forming a plateau for VHCF. Cracks initiate from a single site on the surface or subsurface. Site-specific focused ion beam sampling and transmission electron microscopy characterization reveal that the crack initiation is governed by slip-induced localized plastic deformation. Microcracks initiate near non-metallic inclusions or slip band-grain boundary site. Plus, a life correlation model considering the size of micro-defect was proposed to better correlate the fatigue life.