Mohammad Ali Mohtadi Bonab

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.