机车轮箍在使用过程中发生崩箍。为确定轮箍断裂原因，使用扫描电镜和金相显微镜对试样的断口、裂纹和组织进行了观察和分析。结果表明，该轮箍断裂属于疲劳断裂，疲劳裂纹起源于轮箍内径表面扣环安装槽外侧的焊接区域。
A locomotive wheel tyre was fracture in the course of using. In order to find out the fracture reason, SEM and metallographic microscope have been used to analyse the fracture surface, cracks and microstructure on the fractured locomotive wheel tyre. The resalts show that the fracture belongs to fatigue fracture, which is due to the weld structure on the inner diameter surface outboard of the mounting groove of the wheel tyre retaining ring.
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