Deformation microstructure of a microalloyed homogenized high-Mn steel is
investigated after hot compression at 900 C. EBSD and TEM investigations
of deformation microstructure reveal that in the absence of significant
dynamic recrystallized grains, planar dislocation structures, microbands, TiC
precipitates, as well as HCP martensite are formed within the hot deformed
austenite grains. Interestingly, EBSD reveals the presence of twin-like
structures and kink band in the austenite after hot deformation, for the first
time in this study. Kernel average misorientation profile indicates that slip is
distributed between the twin-like structure and the parent austenite resulting
in wide range of variation in the texture of austenite. Moreover, the grain
boundary character analysis of twin-like structure indicates that the low angle
grain boundaries are gradually converted into high angle boundaries with
misorientation of 60 during the course of deformation.