摘要
通过对断裂后的球头销化学成分、宏观形貌端口、显微组织、硬度进行分析,研究了重载车辆用球头销断裂的原因。结果表明:球头销断裂的类型为脆性断裂,球头销淬火层硬度分布不均,造成断裂强度不足,是导致断裂的重要原因;由于未对球头销进行调质处理,使其基体强韧性不足,也是导致构件断裂的关键因素。
Through analysis of chemical composition, macro-morphology, microstructure and hardness of ball pin after fracture, the causes of fracture of ball pin used in heavy duty vehicles were studied. The results show that, the fracture type of ball pin is brittle fracture. The uneven distribution of hardness of hardening layer of ball pin leads to insufficient fracture strength, which is an important cause of fracture. Because the ball pin has not been quenched and tempered, the strength and toughness of the matrix is insufficient, which is also the key factor leading to the fracture of the component.
引文
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