α′-Martensite formation in deep-drawn Mn-based TWIP steel

To understand the formation of alpha'-martensite in high stacking fault energy twinning-induced plasticity steel deformed in the deep drawing mode, the existing phases were investigated using magnetic and transmission electron microscopy (TEM). Small fractions of alpha'-martensite were quantitatively determined by magnetization saturation experiments and further observed by TEM. TEM revealed the formation of alpha'-martensite at shear band and twin intersections.