Abstract
The austenite transformation behavior and mechanical properties of medium manganese steel subjected to tensile strain were studied by electron backscatter diffraction, X-ray diffraction and tensile tests. The results show that the austenite phases are mainly distributed on the grain boundary in the duplex microstructure of austenite and ferrite, and it is easy for the big-size austenite to transform at small beginning tension strain following the mechanisms of both austenite (fcc) → e-martensite (hcp) → α-martensite (bcc) and austenite (fcc) → α-martensite (bcc). Both yield strength and tensile strength increase with the increase in pre-strain, and the total elongation decreases, while the value of pre-strain plus total elongation almost keeps constant. During tensile deformation, transformation from austenite into martensite improves work-hardening rate remarkably.
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