High-Mn twinning-induced plasticity steels with additions of C and A1 were fully austenitic at room temperature and had a stacking-fault energy within the range of 20 to 30mJ/m2 required for mechanical twin formation.

High Manganese Advanced High Strength TWIP Steel for Automotive Applications. B.C.De Cooman: Materials Research Society Symposium Proceedings, 2011, 1296, 1-12