【摘要】 通过对导流管工况条件、破裂宏观特征、断口微观形貌及断口腐蚀产物的综合分析 ,认为该导流管属腐蚀疲劳破坏 ,引起腐蚀疲劳的交变应力来自高温高速蒸汽冲击时产生的振动 ,断口上有腐蚀性元素 ,裂纹扩展区断口呈双重锯齿状 ,可以确认部件是在交变弯曲应力作用下发生的腐蚀疲劳破坏更多还原

【Abstract】 A systematical analysis on service environment,macro- and microscopic morphologies of failure surfaces and corrosion products on failure surfaces showed that the failure of a diversion tube inside a bellows was resulted from corrosion fatigue.The fatigue cyclic stresses came from the vibration due to the impact of high-speed steam.Aggressive elements were found on failure surfaces,and the morphologies of failure surfaces in crack propagation region were double sawtooth,which further confirmed the above conclusion.更多还原