Influence of carbon addition on mechanical properties of Fe–Mn–C twinning-induced plasticity steels

Mechanical properties and microstructural evolution of Fe–22Mn–0.6C and Fe–22Mn–1.0C (wt.%) twinning-induced plasticity (TWIP) steels were investigated by monotonic, stress-relaxation and unloading–reloading tensile tests. The dynamic strain aging (DSA) effect, resulting from pinning of dislocations, effectively improved the dislocation activation volume of the two TWIP steels. In the meanwhile, DSA-facilitated twinning nucleation mechanism kept...