Study on dynamic recrystallization behavior of 1MnCrMoNi steel during hot compression deformation

The deformation behavior of 1MnCrMoNi steel at the temperatures of 1000 °C-1150 °C and strain rates of 0.001-1 s^-1 was investigated using isothermal hot compression tests on a Gleeble-3800 thermo-simulation machine. The flow curves generally present the typical dynamic recrystallization (DRX) features, but exhibit two distinct characteristics, with or without steady state. However, the curves at emerge bulges between the peak and the steady state due to the faster rate of nucleation than the rate of growth. The activation energy decreases from 432.6 to 381.4 KJ mol^-1 at the initial deformation stage and then increases to 405.4 KJ mol^-1 with the increasing strain. Meanwhile, the DRX kinetics was represented in the form of Avrami equation, and the predicted results agree well with the experimental ones at Moreover, based on the processing maps constructed by the dynamic materials model (DMM), the flow instability in the temperature range of below 1050 °C and the strain rate range of above 0.1 s^-1, the blooming process at the temperature of 1100 °C and the strain rate of 1 s^-1 was determined simultaneously.