【摘要】 10Cr4Ni4Mo4V是在Cr4Mo4V的基础上研制的航空发动机轴承材料。为研究表面损伤对这两种材料疲劳性能的影响,通过含预制表面缺陷和无表面缺陷的滚动接触疲劳实验,研究了表面洛氏缺陷及其边缘突起对这两种材料接触疲劳性能的影响。通过扫描电镜分析了含表面缺陷试样疲劳发展过程及失效形貌,用X射线应力测定仪测量了试样实验前后残余应力随表面至芯部距离的分布。结果表明,表面缺陷以及缺陷边缘的突起均使材料疲劳性能劣化,10Cr4Ni4Mo4V的接触疲劳性能优于Cr4Mo4V。更多还原

【Abstract】 10Cr4Ni4Mo4V steel was developed based on Cr4Mo4V for airplane engine bearings. The effects of surface defects and their shoulders on the rolling contact fatigue behavior of 10Cr4Ni4Mo4V and Cr4Mo4V steels were evaluated in tests of specimens with and without surface defects. The whole fatigue process and the fatigue mechanisms in specimens with surface defects were observed using a scanning electron microscope. The residual stress distributions in the specimens in the depth direction were measured before and after tests using an X-ray diffractometer. The results show that both surface defects and their shoulders significantly accelerate the fatigue damage with the 10Cr4Ni4Mo4V steel having better fatigue resistance than Cr4Mo4V.更多还原