High-Temperature Deformation Behavior of M50 Steel

The hot deformation characteristics of M50 steel in the temperature range 900–1150 °C and strain-rate 0.01–10 s−1 was investigated this study using a Gleeble-3800 thermal simulation testing machine. true stress–strain curves showed that resistance increased with decreasing temperature, increasing strain rate before peak stress reached. After stress, dynamic reversion occurred, consequently, decreased. softening phenomenon more obvious when low. calculated values deformation-activation energy Q index n were 233,684.2 J/mol 5.025568, respectively. On basis, Arrhenius-type constitutive equation established, addition, polynomial fit based on performed to obtain 9th-order strain-compensated high fitting accuracy. By processing flow curves, maps constructed, optimal predicted be 1070–1150 0.01–1 s−1. recrystallization behavior also studied by constructing kinetic model combining optical microscope (OM) electron backscatter diffraction (EBSD) observation. results show increase degree transformation accordingly, original grains gradually replaced recrystallized grains. Besides, process zone for processing, grew temperature.