Deformation behavior of nickel based superalloy GH4169 through solution treatment

The microstructure observation results of superalloy superalloy GH4169 show that during the holding time at 1233, 1253, 1273 and 1293 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 1123-1288 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.