On the Prediction of Stacking Fault Energy on Medium MN Steels

Stacking fault energy estimation is considered as an important stage in the process of designing advanced high-strength steels. Therefore, in the present study, the thermochemical model of Olsen and Cohen was employed to calculate the stacking fault energy (SFE) in Fe–C–Mn–Al–Si steels with <0.6 wt % C, manganese 3–10 wt %, aluminum 0.5–3 wt % and silicon 0.5–3 wt %. The calculation findings revealed that besides the importance of high Mn, the addition of Al and Si leads to SFE values in the range of 20–40 mJ/m2 that allows the activation of twinning induced plasticity (TWIP) and/or transformation induced plasticity (TRIP) effects.