结果表明黑色组织降低了齿轮的疲劳性能，尤其是弯曲疲劳性能。
The results showed that black microstructure reduced fatigue behaviors, especially repeated bend behaviors.
同时，共渗在空心滚子内表面造成的压应力对改善弯曲疲劳性能有利。
Meantime, the compressive stress in inner surface of hollow roller by nitrocarburizing is available for improvement of bend fatigue property.
分析表明，高幅值的残余压应力和“有效晶粒”细化是提高弯曲疲劳性能的主要因素。
The results of the analyses show that high residual compressive stress and fine scattered martensite units are the main cause of improving fatigue properties.
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