关键词: 高温合金, 热处理, 相转变, 塑性变形, 模型

Abstract: The microstructure observation results of superalloy superalloy GH4169 show that during the holding time at 1 233, 1 253, 1 273 and 1 293 K for 30 up to 60 minutes the morphology of the δ phase changes from long needle shape to short bars and particles, accompanies by a corresponding the decrease of δ phase content until it disappears. The effect of the processing parameters and solution treatment on the deformation behavior of superalloy GH4169 is investigated using compression tests. Experiments are carried out in a Thermecmaster-Z simulator at deformation temperatures of 1 123-1 288 K, and strain rates of 0.1-10.0 s^-1. The results shows that the flow stress increases drastically with the decrease of deformation temperature and the increase of strain rate. The existence of the δ phase not only decreases the flow stress, but also effectively promotes the dynamic recrystallization process. The flow stress model of superalloy GH4169 during high temperature deformation is established by using the regression method. The average relative difference between the calculated and the experimental flow stress is less than 10%. It can be concluded that the flow stress model can efficiently effectively predict the deformation behavior of superalloy GH4169 during high temperature deformation.

Key words: superalloys, heat treatment, phase transition, plastic deformation, model