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首页> 外文期刊>Engineering failure analysis >The failure analysis of the repeat geartooth breakage in a 40 MW steam turbine load gearbox and the butterfly in the carburized case
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The failure analysis of the repeat geartooth breakage in a 40 MW steam turbine load gearbox and the butterfly in the carburized case

机译：40 MW汽轮机负荷齿轮箱和渗碳箱中蝶形齿轮重复断裂的故障分析。

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摘要

A repeat premature geartooth breakage occurred in a load gearbox of a 40 MW steam turbine. Fractographic examination indicated that the fatigue crack originated from the root fillet of the non-active flank and propagated to the active flank. The oil deposit on the fracture surface has been applied as an auxiliary fractographic method to distinguish the fatigue crack path. The root cause of the fatigue failure was the improper heat treatment, including the very coarse microstructures due to the direct quenching from the carburiz-ing, plus the shallow case and the insufficient surface hardness by the post-quenching grounding. The solution was successful. Some butterfly characteristics in this case study contradicted to the previous theories. The butterflies initiated from neither non-metallic inclusion nor carbide. The butterfly cracks did not propagate into the martensitic matrix. A butterfly observed in the subsurface of the gear-root indicated that the butterfly formation was irrelevant to the Hertzian stress.
机译：40 MW汽轮机的负载齿轮箱中反复发生齿轮过早断裂。断口检查表明，疲劳裂纹起源于非活动侧面的根部圆角，并传播到活动侧面。裂缝表面上的油沉积已被用作辅助分形方法来区分疲劳裂纹路径。疲劳失效的根本原因是热处理不当，包括由于渗碳直接淬火导致的非常粗糙的微观结构，浅层的情况以及淬火后接地导致的表面硬度不足。解决方案成功。本案例研究中的某些蝴蝶特征与先前的理论相矛盾。蝴蝶既不是由非金属夹杂物也不是由碳化物引发的。蝶形裂纹没有传播到马氏体基体中。在齿轮根下表面观察到蝴蝶，表明蝴蝶的形成与赫兹应力无关。

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