某钛合金壳体在进行冲击试验时开裂,外表面有液压油喷出。对钛合金壳体裂纹进行了外观检查,对其裂纹断口进行了宏、微观观察,并对其组织和硬度进行了检查。结果表明:钛合金壳体的裂纹性质为疲劳开裂;在壳体进行粗加工过程中,壳体壁厚较薄部位的硬而脆的富氧α层处萌生了裂纹,并发生了扩展。 A titanium alloy shell cracked in the impact test, the outer surface of the hydraulic oil spray. The appearance of titanium alloy shell crack was inspected, the fracture of the crack was observed macroscopically and microscopically, and its structure and hardness were examined. The results show that the crack property of the titanium alloy shell is fatigue cracking. During the roughing of the shell, cracks are formed and cracked in the hard and brittle oxygen-rich α layer with thin wall thickness.