某型号战车内部管路组件开裂原因

Cracking Causes of Internal Pipeline Components of a Certain Type Tactical Vehicle

某型号战车服役期间内部管路组件发生开裂失效。采用宏观观察、低倍检验、化学成分分析、拉伸试验、金相检验、微观分析等方法对管路组件开裂原因进行了分析。结果表明:盖板厚度方向上未能焊透是管路组件发生开裂失效的主要原因,冷却液中氧、硫等典型腐蚀性元素的引入是管路组件发生开裂失效的次要原因。在应力和腐蚀介质的共同作用下,管路组件发生开裂失效。

The internal pipeline components of a certain type tactical vehicle cracked during service.The cracking causes of the internal pipeline components were analyzed by means of macro observation,macroscopical examination,chemical composition analysis,tensile test,metallographic examination and micro analysis.The results show that the cover plate not welded in the thickness direction was the main cause for cracking failure of the pipeline components.The introduction of oxygen,sulfur and other typical corrosive elements in coolant was the secondary cause of cracking failure of the pipeline components.Under the combined action of stress and corrosive medium,the pipeline components cracked and failed.