汽车助力转向泵失效分析

Failure Analysis on an Automobile Power Steering Pump

汽车助力转向泵失效是一起多零件断裂共存的事故。采用化学成分分析、硬度测试、宏观和微观分析以及扫描电镜和能谱分析等方法,分析了该汽车助力转向泵失效的原因。根据从理化检验获得的结果,并考虑到当泵进行运转时每个零件所起的作用和承受的载荷,找出了叶片是首裂件,其断裂的原因归之于叶片内部存在严重的长串状夹杂物缺陷。

The automobile power steering pump failure was an accident caused by multiple parts fracture coexistence.Means such as chemical compositions analysis,hardness test,macro and micro analysis,scanning electron microscopy and energy spectrum analysis,as well as other approaches were used to analyze the failure causes of an automobile power steering pump.According to the results obtained from physical testing and chemical analysis,and considering the functions and load capacity of each part when the pump was in operation,it was found out that the blade was the primary fracture part,and the reason for the blade fracture was that there were severe long string shape inclusion defect in the blade.