The influence of carbon content upon the stacking-fault energy of Fe-20Mn-3Cu twinning-induced plasticity steel was investigated by means of X-ray diffraction peak-shift methods and thermodynamic modelling. The experimental results indicated that the stacking-fault probability decreased with increasing carbon addition. The stacking-fault energy increased linearly when the carbon content was between 0.23 and 1.41wt%. The thermodynamic calculation results showed that the stacking-fault energy varied from 22.40 to 29.64mJ/m2 when the carbon content changed from 0.23 to 1.41wt%. Effect of Carbon Content on Stacking Fault Energy of Fe-20Mn-3Cu TWIP Steel. X.Peng, D.Y.Zhu, Z.M.Hu, M.J.Wang, L.L.Liu, H.J.Liu: Journal of Iron and Steel Research International, 2014, 21[1], 116-20