摘要
应用表面轮廓仪、维氏硬度计、残余应力X射线测定仪、光学显微镜、扫描电子显微镜(SEM)、滚动接触疲劳试验机等,对比研究表层超硬化M50NiL钢和M50钢制圆棒试样的硬度梯度、残余应力梯度以及组织结构,实测各自滚动接触疲劳寿命,并对比分析失效过程,探讨表层超硬化M50NiL钢的疲劳失效机理。结果表明:表层超硬化M50NiL钢失效机理回归赫兹理论,为典型的接触疲劳失效特征,接触疲劳寿命大幅提高;高的表面硬度和表面残余压应力,良好的组织结构,能够完全抑制表面起始裂纹的形成,是失效机理回归赫兹理论的主要原因。
Hardness gradient, residual stress gradient and the organization structure of surface super-hardened M50NiL steel roller and M50 steel roller were studied, the rolling contact fatigue life was measured, and the failure process was analyzed and compared by using surface profiler, Vickers hardness tester, X ray residual stress determinator, optical microscope, scanning electron microscope （SEM） , rolling contact fatigue test machine and other equipment. The fatigue failure mechanism of surface super-hardened M50NiL steel was revealed. The results show that the fatigue failure mechanism of surface super-hardened M50Nil steel returns to the Hertz the-ory and shows typical contact fatigue characteristics. The high surface hardness, residual compressive stress and a good organization structure can completely inhibit the initiation of surface cracks; therefore, the failure mechanism is returned to the Hertz theory.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2017年第6期34-40,共7页
Journal of Aeronautical Materials
基金
973项目资助
