Effects of Solid Solution Treatment and Fatigue Load Holding Time on Fatigue Crack Growth Rate of FGH96 Superalloy at High Temperature
Author of the article:ZENG Weihu;ZHOU Xiaoming;FENG Yefei;WANG Chaoyuan;ZOU Jinwen
Author's Workplace：Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Beijing 100095,China
Key Words：FGH96 crack growth heat treatment
Abstract：The fatigue crack growth rate of FGH96 alloy was measured in 650 ℃ and air conditions. The effects of microstructure, solid solution cooling rate and fatigue load holding time on the crack growth rate of FGH96 alloy were investigated. The results show that the alloy microstructure with good fatigue crack growth resistance can be obtained by controlling the cooling of the solid solution treatment and making the uniform matching precipitation of the second and third order γ′ phase. The high temperature fatigue crack growth rate of FGH96 alloy increases with the increase of load holding time, and its fracture mode is intergranular fracture.
