Fracture Cause of High-Speed Carburized Gear Tooth in a Thermal Power Plant
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摘要: 某火电厂给水泵耦合器二级从动渗碳齿轮多处轮齿发生断裂。通过宏/微观形貌观察、化学成分检测、金相检验以及力学性能测试等方法分析了轮齿断裂原因。结果表明：轮齿齿面处渗碳层表面硬度不足，耐磨性能和抗疲劳性能较差，在接触应力长期反复作用下，轮齿齿面表层金属剥落形成麻坑，同时齿轮组织中存在白点缺陷，材料的综合力学性能不足；在齿轮高速转动过程中，齿面受接触应力作用，裂纹在剥落麻坑周围应力集中处萌生并迅速扩展，导致轮齿发生脆性断裂。Abstract: Several gear teeth of a secondary driven carburized gear for a feed water pump coupler in a thermal power plant were broken.The fracture cause of gear teeth was analyzed by macro and micro morphology observation, chemical composition measuring, metallographic inspection and mechanical property testing.The results show that the surface hardness of the carburized layer of the gear tooth flank was insufficient, and the wear resistance and fatigue resistance were poor.The surface metal of the gear tooth flank peeled off to form spalling pits under long-term repeated contact stresses.Meanwhile flake defects existed in the microstructure of the gear.The comprehensive mechanical properties of the material were inadequate.During the high-speed rotation of the gear, the tooth flank was subjected to contact stresses, and cracks were initiated at stress concentration areas around the spalling pits and expanded rapidly, resulting in the brittle fracture of the gear teeth.
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Keywords:
- high-speed gear /
- carburized layer /
- spalling pit /
- flake defect /
- brittle fracture
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