通过断口宏微观形貌观察、化学成分分析、显微组织观察以及硬度测试等方法，系统分析了某大功率风力发电机增速齿轮断裂的原因。结果表明：轮齿外表面存在密集分布的点蚀坑及微孔缺陷，是裂纹源；在较高水平的冲击与弯曲载荷共同作用下使微裂纹扩展，从而最终导致齿轮疲劳断裂。
By means of macro and micro fracture morphology observation, chemical composition analysis, microstructure observation and hardness test, the failure causes of the boost gear of a large capacity wind power generator were investigated systemically. The results show that densely distributed pits and micro-voids existed on the external surface of the gear. which were the crack origins, Caused the mirco cracks propagation under the combined action of severe impact and bending load, and finally resulted in the fatigue fracture.
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