Research on the dynamic recrystallization kinetics of Aermet100 steel

Using the compression tests on a Gleeble-3800 thermo-mechanical simulator, the hot deformation behavior of ultrahigh strength Aermet100 steel was studied in the temperature ranges of 800-1200 °C and the strain rate ranges of 0.01-50 s^-1. Dependence of the peak stress on temperature and strain rate for Aermet100 steel is described by means of the conventional hyperbolic sine equation; By regression analysis, the activation energy in the whole range of deformation temperature was determined to be Q = 489.10 kJ/mol. The dynamic recrystallization (DRX) kinetics of Aermet100 steel is established by further analysis of true stress-true strain curves. The complete DRX grain size is dependent only on Zener-Hollomon parameter (Z) and is independent of the initial grain size and accumulated strain, because Z controls the stored energy. The complete DRX grain size is a power law function of Z with an exponent of -0.24.