Deformation Twinning Behavior of Twinning-Induced Plasticity Steels with Different Carbon Concentrations

In the previous paper, carbon concentration dependence of deformation twinning behavior in twinning-induced plasticity steels had been investigated, which clarified that the deformation twin fraction in the <144> tensile orientation did not change against carbon concentration. Additionally, in this paper, twinning deformation occurred in the Fe-18Mn-1.2C steel at 473 K with relatively high stacking fault energy of 55 mJ/m2. To explain these experimental results, dynamic strain aging of Shockley partials dislocations was proposed as an additional contributing factor to assist the deformation twinning in high carbon-added austenitic steels. Most abnormalities about deformation twinning such as the high stacking fault energy in Fe-Mn-C austenitic steels were interpreted by considering the influence of dynamic strain aging.