Effects of aging and thread rolling process sequence on tensile-tensile fatigue of GH4169 alloy bolt

GH4169 superalloy has excellent corrosion resistance, high temperature strength, good machinability and high temperature stability.Therefore, GH4169 was widely used in the manufacturing field of aviation equipment components. In this paper, GH4169 was used as the research material to analyze the effects of aging treatment and thread rolling process sequence on metallographic structure, thread morphology, tension-tension fatigue life and fracture morphology. The results showed that the manufacturing process of aging treatment before thread rolling process can reduce the grain size of the material and have good thread morphology, and its tension-tension fatigue life is higher than that of aging treatment after thread rolling process. And there were obvious differences in fracture morphology.