Microstructure and Texture Evolution in a Cold-Rolled High Mn Steel with Microadditions of Ti and Nb

The aim of this work was the microstructure and texture analysis of a deformed via cold-rolling 24.5Mn-3.5Si-1.5Al-Ti-Nb TWIP/TRIP type steel. It was found, that during cold plastic deformation, phase transformation of austenite into martensite takes place. The transformation progress was confirmed by the microscopic investigations. The texture of austenite is characterized by a limited alpha(1)=<110>parallel to RD fibre and the gamma=<111>parallel to ND fibre. The texture of austenite changed with increasing deformation rate. In the texture of deformed austenite the strongest orientation is the {110}<001> Goss orientation, which belongs to the alpha=<110>parallel to ND orientation fibre. During cold plastic deformation gamma ->epsilon and gamma ->epsilon ->alpha' phase transformations as well as the deformation of gamma, epsilon and alpha' phases are taking place in the steel. The formed epsilon phase (hexagonal structure) also possesses a distinct texture.