文献类型：期刊文献

英文题名：Failure mechanisms and design of dissimilar welds of 9%Cr and CrMoV steels up to very high cycle fatigue regime

作者：Zhang, Wei-Chang[1];Zhu, Ming-Liang[1];Wang, Kai[1];Xuan, Fu-Zhen[1]

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

年份：2018

卷号：113

起止页码：367

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20181905176314);WOS:【SCI-EXPANDED(收录号:WOS:000437373300034)】；

基金：The authors are grateful for the support provided by the National Natural Science Foundation of China (51575182).

语种：英文

外文关键词：Very high cycle fatigue; Welded joint; Crack initiation; Fatigue strength reduction factor; Fatigue design

摘要：Cross-weld and pure base metal specimens machined from dissimilar welded joints of 9%Cr and CrMoV steels were cyclically loaded up to very high cycle fatigue at 500 degrees C under load ratio of zero. Results showed fatigue strength of the welds was greatly weakened, lower than base metals. A transition of failure mechanisms from geometrical soft zone in heat-affected zone of CrMoV steel to micro-defects induced cracking at weld metal was responsible for decreasing fatigue strength reduction factor with the increasing of fatigue lifetime. A sound fatigue design requires careful selection of filler metal and consideration of soft zone and micro-defects.