Effects of Aluminum on Hot Deformation Behavior of Medium Manganese Steels

The single pass compression experiment of two Fe-10Mn-0.1C (wt%) and Fe-10Mn-2Al-0.1C (wt%) medium-Mn steels were carried in the temperature range of 900-1100℃ and strain rate range of 0.01 to 10 s^-1 on Gleeble-1500 thermal-mechanical simulator.The results show that the flow stress of 10Mn2Al steel is higher than that of 10Mn steel at the same hot deformation condition. By the analysis of hot compression curve, the constitutive equation is developed for both steels. The activation energy Q about 372.327 kJ/mol for the 10Mn2Al steel is higher than that of the 10Mn steel (329.697 kJ/mol). The dependence of the peak stress and the peak strain on Zener-Hollomon parameter of two steels is plotted. The Zener-Hollomon exponents of the 10Mn steel are higher than that of the 10Mn2Al steel. The Avrami kinetics of dynamic recrystallization of both steels was investigated.The Avrami time exponent is about 2.096 for 10Mn2Al steel, which is higher than that(1.986) for 10Mn steel.