【摘要】 采用体视检测、显微组织观察和硬度测试等分析方法,对汽车后桥半轴早期失效原因进行分析。结果表明,材料失效的主要原因是前期调质处理时由于过热导致心部组织粗大,且表面感应淬火层组织粗大,淬硬层偏深,严重降低材料的强度与韧性。同时断口附近组织中的大块非金属夹杂也是导致材料应力集中形成裂纹的原因之一。更多还原

【Abstract】 The results show that the superheating during austenitization leads to coarse structure in the shaft core;the microstructure of induction hardened layer is also coarse and the hardened depth is too thick therefore the strength and toughness of the shaft are decreased severely.That is the main reasons why the shaft failures.On the other hand,the large non-metallic inclusion around the fracture also can be the reason.更多还原