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    304不锈钢扁圆头方颈螺栓断裂原因

    Fracture reason of flat round head square neck bolt of 304 stainless steel

    • 摘要: 某304不锈钢扁圆头方颈螺栓在第二次紧固过程中发生断裂现象。采用宏观观察、化学成分分析、断口分析、金相检验、金属流线检测、着色渗透检测和力学性能测试等方法对螺栓断裂原因进行分析。结果表明:螺栓试样的显微组织、非金属夹杂物、金属流线和内部裂纹检查结果均无异常,化学成分分析、抗拉强度测试结果均符合相应标准要求;断口微观形貌呈明显的解理断裂特征,螺栓断裂性质为脆性过载断裂,断裂原因为头部断裂起始区存在应力集中。

       

      Abstract: The flat round head square neck bolt of 304 stainless steel fractured during the second fastening process. The causes of bolt fracture were analyzed by means of macroscopic observation, chemical composition analysis, fracture analysis, metallographic examination, metal streamline detection, coloring penetration test and mechanical property test. The results show that there were no abnormalities in the microstructure,non-metallic inclusions,metal streamlines and internal cracks of the bolt samples, and the chemical composition analysis and tensile strength test results met the requirements of the corresponding standards. The fracture morphology showed obvious cleavage fracture characteristics. The fracture property of the bolt was brittle overload fracture, and the fracture reason was that there was stress concentration in the initial area of the head fracture.

       

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