Effects of microstructure on very-high-cycle fatigue crack initiation and life scatter for a high strength steel
A type of high strength steel was tempered at 150℃,180℃,and 300℃ to form three groups of specimens,and rotating bending fatigue tests were performed to investigate the effects of microstructure on the behavior of very-high-cycle fatigue (VHCF) crack initiation.With the increase of tempering temperature,S-N curves for the three specimen groups show a tendency of increasing life scatter and the threshold value of VHCF crack initiation ΔKFGA decreases.For 150℃ tempered specimens,grain boundary initiation is dominant for fatigue crack initiation while inclusion initiation is dominant for the other two groups.Effects of inclusion and retained austenite on fatigue crack initiation are discussed,and reliability analysis based on Tanaka-Mura model is carried out to characterize VHCF life scatter.
Very-high-cycle fatigue FGA life scatter inclusion
Zhengqiang Lei Jijia Xie Sun Chengqi Xiaolong Liu Youshi Hong
State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,PR China
国际会议
北京
英文
1-8
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）