Effect of stacking faults on the ductility of Fe-18Mn-1.5Al-0.6C twinning-induced plasticity steel at low temperatures

Tensile deformation behavior of the Fe-18Mn-1.5Al-0.6C twinning-induced plasticity steel has been investigated at room temperature, - 125 degrees C, and - 196 degrees C. The steel shows the largest ductility at - 125 degrees C and the smallest ductility at - 196 degrees C. While work hardening rate continuously decreases with strain at - 196 degrees C, the specimens tested at other temperatures show a stage where work hardening rate continuously increases with strain, which is more evident at - 125 degrees C. Stacking faults form most actively at - 125 degrees C and this contributes to a continuous increase in work hardening rate with strain and an increase in ductility at -125 degrees C. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.