对双真空32Cr3MoVE钢深氮化件进行接触疲劳试验研究和全面分析。结果表明,失效形貌呈典型的接触疲劳特征,两种疲劳裂纹形成模式同时存在。深氮化试件具有优良的硬度梯度和残余压应力分布,与渗碳件相比接触疲劳寿命提高3.3~4.5倍。

The contact fatigue experiment study was carried out for VIM+VAR 32Cr3MoVE steel by deep nitriding.The results showed that failure morphology was of typical contact fatigue characteristics,and two modes of fatigue crack formation worked.The steel by deep nitriding possessed excellent microhardness gradient and favorable distribution of residual compressive stresses,and the contact fatigue life of nitrided steel under the given load showed a great improvement in relation to carburized 18CrNi4A steel.