Hot Deformation Behavior of Fe-Mn-Al Light-weight Steel

The hot deformation behaviors Fe-Mn-Al light-weight steel were investigated by means of isothermal compression test within the range of 900∼1150 °C at different strain rate of 0.01, 0.1, 1, 1 0 s-1 and the maximum deformation degree 60%. The results show that temperature plays an important role in the hot compression deformation of Fe-Mn-Al steel. With the increase of deformation temperature and rate, the recrystallization degree increases gradually and fine austenite structure was obtained and deformed ferrite was kept and distributed perpendicular to compression direction. Based on the stress-strain curves, the activation energy for deformation and thermal deformation equation were derived after fitting analysis of experimental data of dynamic recrystallization. Calculated thermal activation energy was 294.204 kJ/mol with the temperature range of 900∼1150 °C. Dynamic recrystallization of experimental steel is sensitive to deformation temperature and strain rate, and increasing deformation temperature or decreasing strain rate would promote dynamic recrystallization and growth for both austenite and ferrite.