1. Xi’an Key Laboratory of Extreme Environment and Protection Technology,
School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou 412002, China
As a new generation burner inner liner material, the creep properties of GH3230 nickel-based superalloy are particularly important when serving in extreme high temperature and high pressure environments. In this paper, the creep experiments of GH3230 superalloy under different stresses and temperatures(800, 900 and 1000 ℃) were conducted. The creep deformation of GH3230 alloy was predicted based on the modified θ parameter method and composite time-hardening model, and the high temperature creep fracture mechanism was explained. The results show that the creep deformation of GH3230 alloy is closely related to temperature and stress. The higher the temperature and stress, the shorter the creep life. The modified θ parameter method can predict the creep deformation better when the temperature and stress are high, while the composite time-hardening model can predict the creep deformation better when the temperature and stress are low. The creep fracture of GH3230 alloy is a cavity aggregation cleavage fracture, and the fracture path shows that it is mainly dominated by grain boundary migration, and the higher the creep temperature, the larger the fracture dimple size.