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通过宏观观察和断口的微观分析,确认10.9级M72×4六角头螺栓的断裂是由淬火裂纹引起;淬火裂纹的发生则是设计和生产过程中的失误所致。提出了相应改进措施。
Through the macroscopic observation and the microscopic analysis of the fracture, it is confirmed that the fracture of 10.9 grade M72 × 4 hexagonal head bolt is caused by quenching crack. The occurrence of quenching crack is caused by the mistakes in the design and production process. Put forward the corresponding improvement measures.