High-temperature deformation constitutive relationship and microstructure evolution in Aermet100 steel

High-temperature deformation constitutive relationship and microstructure evolution in Aermet100 steel were investigated with compression tests at deformation temperatures of 800~1200 °C and strain rates of 0.01~50 s^-1 on a Gleeble-3800 thermo-mechanical simulator. Results show that increasing strain rate and decreasing deformation temperature can make the flow stress increase, hamper the occurrence of dynamic recrystallization, and promote the occurrence of work hardening and dynamic recovery in deformation metals. The change law of microstructure and stress-strain curves was investigated using dislocation theory, and reasonable explanation of it was made. The deformation activation energy of Aermet100 steel under the deformation conditions of the compression tests was determined as Q=489.10 kJ/mol. The constitutive relationship between peak stress, strain rate and deformation temperature was established by means of the conventional sinh model.