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Experimental Study of the Effects of Surface Defects on Rolling Contact Fatigue Behavior

机译:表面缺陷对滚动接触疲劳行为影响的实验研究

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Rolling contact fatigue (RCF) cracks initiated from surface and subsurface defects are typical failure modes of bearing systems. In this paper, the effects of surface defects on RCF behavior of M50NiL and M50 steels were studied experimentally. Artificial dents were introduced on the rolling surface by using Rockwell hardness tester. The influences of dent shape and dent shoulders were examined by thrust-type RCF tests. Surface cracks initiation, propagation and spalling were monitored by scanning electron microscope (SEM) observation. The results showed that artificial dents reduce RCF lives of M50NiL and M50 steels with mineral oil lubrication. The fatigue failure initiates at the surface defect with the effects of dent shape and dent shoulder. M50NiL steel has higher contact fatigue resistance than M50. The features of surface and sub-surface cracks propagation during RCF tests were also observed.
机译:从表面和地下缺陷发起的滚动接触疲劳(RCF)裂缝是轴承系统的典型故障模式。在本文中,实验研究了表面缺陷对M50nil和M50钢的RCF行为的影响。使用罗克韦尔硬度测试仪在轧制表面上引入人造凹痕。通过推力型RCF试验检查凹痕形状和牙齿肩部的影响。通过扫描电子显微镜(SEM)观察,监测表面裂缝引发,传播和剥落。结果表明,人造凹痕通过矿物油润滑降低了M50nil和M50钢的RCF寿命。疲劳失效在表面缺陷中引发了凹痕形状和凹凸肩部的影响。 M50nil钢的接触疲劳性高于M50。还观察到在RCF试验期间的表面和亚表面裂缝繁殖的特征。

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