The broken teeth were analyzed by metallographic microstructure examination,macro and micro-fractography,the hardness and cementite stratum were checked.

• 本文对故障斜齿轮进行了外观和痕迹检查,对轮齿断口和裂纹断口进行了微观观察,检查了轮齿硬度、金相组织及渗碳层。