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 |