通过滚动接触疲劳试验方法, 研究了两种渗碳齿轮钢的接触疲劳性能. 结果发现, 渗碳齿轮钢接触疲劳试样失效方式主要为渗碳层的点蚀和剥落. 氧含量较低的Nb微合金化齿轮钢(含0.04%的Nb)中氧化物夹杂数量少、尺寸小, 接触疲劳裂纹起裂较难; 同时, Nb微合金化齿轮钢渗碳层晶粒尺寸小、硬度高, 提高了疲劳裂纹萌生及扩展阻力,导致Nb微合金化后, 齿轮钢的接触疲劳寿命大幅度提高.
Contact fatigue properties of two case hardening steels have been investigated by means of rolling contact fatigue tests with carburized specimens. Results show that most of the rolling contact fatigue specimens failed due to pitting and spalling in the carburized case. The steel microalloyed with 0.04% niobium has a lower oxygen content and fewer quantity and smaller size of oxide inclusions, which makes fatigue crack initiation more difficult. Moreover, it is also more difficult for fatigue crack propagation in the case of the niobium microalloying steel, owing to its finer grain size and higher hardness. As a result, the rolling contact fatigue life of the steel microalloyed with niobium is much higher than that of the steel without microalloying.
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