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为查找某汽车安装螺栓的断裂原因,对螺栓进行了断口宏观、SEM电镜、化学成分、金相组织分析,并对同批次完整螺栓进行了力学性能测试。在各项理化试验的基础上,结合微观断口的形貌和断裂机理对螺栓的断裂原因进行了分析。结果表明:螺栓螺纹表面存在微裂纹是螺栓断裂的主要原因。
In order to find out the cause of the fracture of a certain automobile mounting bolt, the fracture of the bolt was analyzed macroscopically, SEM, chemical composition and microstructure analysis, and the mechanical properties of the bolts of the same batch were tested. On the basis of various physical and chemical tests, the fracture reason of the bolt was analyzed based on the morphology and fracture mechanism of the microscopic fracture. The results show that the existence of micro-cracks on the screw thread surface is the main reason for the bolt fracture.