Axle heat damage caused by a wheel bearing fracture may lead to such a condition.

轮轴承断裂造成轴的热损伤可能会导致这类情况。

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The results show that the fracture may be due to improper heat treatment which leads to over hardness of the thread part and the joint of thread part and tooth part.

结果表明，断裂是由于热处理工艺不当、管子钳活动钳口齿部、螺纹部以及螺纹和齿部的过渡连接部分硬度过高引起；

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The results showed that fracture of axle pin was caused by improper heat treatment.

试验结果表明，造成轴销断裂的主要原因是热处理工艺控制不当。

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