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[Pan Yifan,Liu Daoxin,Liu Dan,Ma Amin and Liu Bo.Effect of Shot Peening Combined Vibration Finishing on Fatigue Behavior of GH4169Superalloy[J].Rare Metal Materials and Engineering,2022,51(8):2955~2962.]
Effect of Shot Peening Combined Vibration Finishing on Fatigue Behavior of GH4169Superalloy
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Received:July 13, 2021  Revised:August 14, 2021
Key words: GH4169superalloy  shot peening  vibration finishing  surface integrity  fatigue
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
Author NameAffiliation
Pan Yifan,Liu Daoxin,Liu Dan,Ma Amin and Liu Bo  
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      The effects of shot peening and shot peening combined vibration finishing on the fatigue properties of GH4169superalloy are studied contrastively. The surface morphology, surface structure, roughness, microhardness and residual stress field of the sample were analyzed by scanning electron microscope, roughness profiler, microhardness tester, and X-ray stress tester, and the internal relationship and mechanism of surface integrity and fatigue performance are discussed. The internal relationship between surface integrity and fatigue properties and its mechanism were discussed. The results show that the composite treatment can improve the fatigue performance better. The composite treatment increases the room temperature fatigue strength of GH4169superalloy by 21.6%. Preheating at 500℃for 100h reduces the fatigue strength of composite strengthened GH4169superalloy by 6%, but it is still 14.29% higher than that of the base material. That is to say, the composite treatment can effectively improve the fatigue resistance of GH4169superalloy under high temperature working conditions from room temperature to 500℃.