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对中间轴三档齿轮的材质、热处理质量、断口形貌和热酸蚀低倍组织进行研究。结果表明,该齿轮断裂为高周疲劳断裂,疲劳源位于齿轮非啮合面的齿根处,此处存在大量显微气泡、气孔、显微缩松及显微缩孔,形成了较大的应力集中,导致其过早萌生疲劳裂纹。在交变压应力作用下产生大面积疲劳裂纹,极大降低了齿轮轮齿的抗弯强度,最终导致轮齿疲劳断裂。
The material, heat treatment quality, fracture morphology and thermal etching microstructure of the third gear of the intermediate shaft were studied. The results show that the gear fracture is a high-cycle fatigue fracture, and the source of fatigue is located at the tooth root of the non-meshing surface of the gear. There are a large number of micro-bubbles, pores, micro-shrinkage and micro-shrinkage cavities, Concentrated, leading to premature initiation of fatigue cracks. Under the action of alternating compressive stress, large-area fatigue cracks are generated, which greatly reduces the flexural strength of the gear teeth and finally leads to the fatigue fracture of the gear teeth.