By the examination of metallographic microstructure and the hardness analysis of failure gear after used, the main reason that the pitting attack damage appears on the surface of gear was found.

• 通过对使用后失效齿轮的金相组织检验及硬度分析,找出齿轮表面产生点蚀损伤的主要原因,并提出了相应的改进措施。