微观分析表明，疲劳断口上韧窝的增大增深、疲劳源数量增加等是疲劳寿命增加的主要原因。
The main reason for the fatigue life enhancement is correlated with the enlarged dimples and more fatigue sources on the fracture surface.
热处理是一个控制过程，用来改变材料(如金属和合金)的微观结构来传递它们的特性，例如可延长组件的使用寿命。
Heat treatment is a controlled process used to alter the microstructure of materials such as metals and alloys to impart properties which benefit the working life of a component, for example.
齿面经过脉冲电化学光整加工后表面粗糙度低、微观几何形貌平滑，不仅使齿轮寿命大幅度提高而且工作噪音也大幅度降低。
The lower surface roughness and smooth microform by electrochemical finishing not only enhance highly the life of gear, but reduce the noise.
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