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Medium manganese (Mn) transformation-induced plasticity (TRIP) steel, with nominal composition of Fe-9Mn-1.5Si-1Al-0.05C, is intercritically annealed after water quenching (WQ) or air quenching (AQ) from austenitization. The results indicate that the lower density of dislocations and a small amount of retained austenite are found in AQ specimen compared with WQ specimen by Xray diffraction (XRD). The higher density of dislocations significantly affects the formation of immovable dislocations and promotes martensitic recovery during the intercritical annealing (IA) process, which ultimately causes yield point elongation and a lower yield strength in WQ-620 sample during the tensile test, respectively. In contrast, AQ-620 specimen relying on an active TRIP effect displays a continuous deformation behavior, slightly better yield strength, tensile strength, and total elongation, simultaneously.

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