航空材料学报2017，Vol.37Issue(6)：25-33,9.DOI:10.11868/j.issn.1005-5053.2017.000127
渗碳M50NiL钢磨削表面完整性特征及疲劳失效机理
Surface Integrity Characteristics and Fatigue Failure Mechanism of Carburized M50NiL Steel
摘要
Abstract
The surface integrity of carburized M50NiL steel was studied by optical microscopy,scanning electron microscopy (SEM),atomic force microscopy (AFM),microhardness tester and residual stress tester.The fatigue properties of the two specimens were measured by the rotational bending fatigue test,and the fatigue test results were simulated and analyzed.The results show that the rotation bending fatigue of carburized M50NiL steel is originated in the sub-surface in the ideal case without considering the surface processing defects.The surface stress concentration factor produced by general grinding causes the fatigue source to be moved from the surface to the sub-surface.Precise grinding improves the surface quality by optimizing the grinding process,effectively restrains the stress concentration of the working surface,and returns the fatigue source from the surface to the sub-surface.The maximum rotary bending fatigue life can be increased by 30 times and the average is 15 times.关键词
M50NiL钢/磨削/表面完整性/疲劳/失效机理Key words
M50NiL steel/grinding/surface integrity/fatigue/failure mechanism分类
航空航天引用本文复制引用
娄艳芝,李春志,李旭东,谢孝昌,赵振业..渗碳M50NiL钢磨削表面完整性特征及疲劳失效机理[J].航空材料学报,2017,37(6):25-33,9.基金项目
973项目资助 （）
