Hot Deformation Behavior and Dynamic Recrystallization of GH4151 Superalloy
The effect of deformation temperature on microstructure evolution and dynamic recrystallization of wrought GH4151 alloy was studied by MTS810-25T low cycle fatigue testing machine at different deformation temperatures.The results show that the peak stress in the true stress-strain curve of GH4151 alloy increases with the decrease of deformation temperature and the increase of strain rate.Based on the true stress-strain curve,the Arrhenious constitutive equation of wrought GH4151 alloy is obtained by linear fitting,which can well describe the hot compression deformation law of wrought GH4151 alloy and obtain the activation energy of hot deformation Q=218.09 kJ/mol.Microstructure analysis shows that the continuous dynamic recrystallization induced by γ'phase and discontinuous dynamic recrystallization with bulging of the original grain boundaries are mainly when in the low temperature.With the increase of deformation temperature,the dynamic recrystallization nucleation is dominated by discontinuous dynamic recrystallization and continuous dynamic recrystallization characterized by subcrystalline rotational polymerization.
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