Table 1: The characteristics of the thermal cycle for the three steels considered. Tis is the isothermal holding temperature, Tmax and Tmin are the maximum and minimum temperatures respectively, HR and CR are the heating and cooling rates respectively, τ is the period of the cycle. The volume fractions of austenite and ferrite at Tis are fγ and fα respectively.
Chemical composition [wt%] A1 [°C] A2 [°C] Tis [°C] Tmin [°C] Tmax [°C] ΔT [°C] HR-CR [°/min] τ [sec] fα fγ
Fe-0.2c-5Mn 634 716 675 640 710 70 10 840 0.394 0.605
Fe-0.2c-0.2Mn 722 828 775 740 810 70 10 840 0.534 0.446
Fe-0.2c 725 835 780 745 815 70 10 840 0.561 0.438