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Effect of Annealing Process on Microstructure and Mechanical Properties in Microalloyed Medium Manganese Steel

The effects of annealing conditions on microstructure evolution and strengthening mechanisms are investigated based on microalloyed medium manganese steel. The diffusion of C and Mn atoms is altered with increase in annealing temperatures or annealing time. Microstructure and mechanical properties are studied. It is found that the retained austenite generated by the reverse transformation of martensite is used to improve the strength and ductility during the intercritical temperature region. The total elongation (TE) is related to the fraction and stability of retained austenite. High strength is also obtained when there is almost no retained austenite below Ac1 temperature.