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    铁路轴箱弹簧断裂原因分析

    Reasons Analysis on Fracture of a Spring of the Railway Axle Box

    • 摘要: 某铁路轴箱弹簧在服役过程中发生断裂。采用化学成分分析、非金属夹杂物检验、硬度测试、显微组织及表面脱碳层检验、断口分析等方法,对弹簧断裂的原因进行了分析。结果表明:在服役过程中,弹簧表面存在的不连续凹痕处产生应力集中并形成裂纹源,疲劳裂纹不断扩展,导致弹簧最终发生疲劳断裂。

       

      Abstract: A spring of the railway axle box fractured during service. The fracture reasons of the spring were analyzed by methods of chemical composition analysis, non-metallic inclusion examination, hardness testing, microstructure and surface decarburization layer examination, and fracture analysis. The results show that:during the service, the discontinuous dents on the spring surface generated stress concentration and became the crack source, and the fatigue cracks expanded constantly, which led to the fatigue fracture of the spring.

       

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