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Damage mechanisms of initiating micro-pitting on 42CrMo4 hardened and tempered steel

机译:42CrMo4调质钢引发微蚀的损伤机理

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摘要

A deep comprehension of the damage mechanisms involved in contact fatigue should optimize material and heat treatment choice for a specific application. In this work rolling disc-on-disc contact fatigue tests have been performed on a hardened and tempered UNI EN 42CrMo4 . The adopted test method creates the best conditions in order to develop micro-pitting on disc surface. Extensive micro-fractographic examinations have been carried out, on the damaged surfaces, through a scanning electronic microscope (SEM). For this steel, loaded with Hertzian pressure of 1000 MPa, the failure mode is always micro-pitting which begins at the surface, and it is not a sub-superficial damaging. If micro-pits develop, they will coalesce in larger craters. By this way, the probability that micro-pitting will degenerate into sub-superficial destructive pitting is very high.
机译:对接触疲劳所涉及的破坏机理的深刻理解应针对特定应用优化材料和热处理选择。在这项工作中,已经在经过淬火和回火的UNI EN 42CrMo4上进行了圆盘滚动接触疲劳测试。所采用的测试方法创造了最佳条件,以便在光盘表面产生微点蚀。已经通过扫描电子显微镜(SEM)在受损表面上进行了广泛的微形貌检查。对于负载有1000 MPa赫兹压力的这种钢,破坏模式始终是从表面开始的微点蚀,而不是表面下的破坏。如果形成微坑,它们将合并成更大的陨石坑。通过这种方式,微蚀变质退化为亚表面破坏性蚀变的可能性非常高。

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