驱动轮轴断裂原因

Cause of drive axle fracture

某型号拖拉机的驱动轮轴在感应淬火后的校直工序中发生断裂,采用宏观观察、金相检验、热酸蚀试验等方法对断裂原因进行分析。结果表明:驱动轮轴在锻造过程中产生了局部过烧,导致材料的强度和塑性大大降低,当受到过大的外部作用力时,零件发生了断裂。

The drive axle of a certain type of tractor fractured in the straightening process after induction quenching.The fracture cause was analyzed by means of macroscopic observation,metallographic examination and hot acid etching test.The results show that the local overburning of the drive axle during the forging process led to a significant reduction in the strength and plasticity of the material.When the external force was too large,the part broke.