文献类型：期刊文献

英文题名：Effect of temperature on high-cycle fatigue and very high cycle fatigue behaviours of a low-strength Cr-Ni-Mo-V steel welded joint

作者：Wu, W.[1];Zhu, M. -L.[1];Liu, X.[2];Xuan, F. -Z.[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]Shanghai Turbine Plant Shanghai Elect Power Gener, Shanghai 200240, Peoples R China

年份：2017

卷号：40

期号：1

起止页码：45

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

收录：;EI(收录号：20162202447139);WOS:【SCI-EXPANDED(收录号:WOS:000389307200004)】；

基金：The authors are grateful for the supports provided by the National Natural Science Foundation of China (51325504, 51575182 and 51205131).

语种：英文

外文关键词：fatigue crack initiation; fatigue strength evaluation; temperature effect; very high cycle fatigue; welded joint

摘要：Axially push-pull fatigue tests of a low-strength Cr-Ni-Mo-V steel welded joint were conducted up to very high cycle fatigue regime at room temperature and 370 degrees C. The S-N curve at room temperature shows a duplex shape, while the S-N curve at 370 degrees C is continuously decreasing with lower fatigue strength. The welds at 370 degrees C undergoes dynamic strain ageing and has an enhanced load-defects interaction, leading to equal distribution of failures among different parts of the welds. The Z parameter model, with micro-defect location incorporated, having sound physical representation, is life-controlling of the welds at high temperature.