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通过扫描电镜观察ＧＨ４１６９高温合金常温与高温低周应力控制疲劳断口的宏观形貌与微观形貌，用断裂力学理论分析了ＧＨ４１６９高温合金疲劳断口的宏观形貌和微观形貌的特征、疲劳断裂的过程以及表面完整性对疲劳断口的宏观形貌和微观形貌的影响规律
The macroscopic morphology and microstructure of the fatigue fracture of GH4169 superalloy under normal temperature and high temperature and low temperature stress control were observed by scanning electron microscopy. The macroscopic and microscopic features of fatigue fracture of GH4169 superalloy were analyzed by fracture mechanics theory. The fatigue fracture The process and the influence of surface integrity on the macroscopic and microscopic morphology of the fatigue fracture