Hot Deformation Behavior, Dynamic Recrystallization and Processing Map of Fe-30Mn-10Al-1C Low-Density Steel

In this paper, the hot deformation behavior of Fe-30Mn-10Al-1C low-density steel was investigated by Gleeble-1500D thermomechanical simulator at a temperature range of 850-1100 degrees C and a strain rate range of 0.01-10 s(-1). The constitutive equation and dynamic recrystallization (DRX) kinetic model of the experimental steel were established. Processing maps under different strains were drawn to explore the optimum hot working parameters of the steel. The results show that the flow stress decreases with increasing deformation temperature and increases with increasing strain rate. The average activation energy of hot deformation (Q) was calculated to be 391.57 kJ/mol. The volume fraction of DRX grains increases with the increase in strain with a sigmoid-shape curve. Dislocation slip is the predominant deformation mechanism of the experimental steel with increasing hot compression temperature. The optimum hot working parameters of the experimental steel are: a deformation temperature of 975-1100 degrees C, a strain rate in the range 0.01-1 s(-1), and the efficiency of power dissipation of 36-64%.