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.