Abstract
The incorporation of retained austenite (RA) into press-hardened steel (PHS) has garnered significant attention due to its ability to enhance plasticity through the utilization of transformation-induced plasticity (TRIP) effect. In this study, a novel approach involving temporary reservoir phase was employed, whereby the localized chemical gradient induced by partial or complete dissolution of the reservoir phase during heating process can effectively enhance the volume fraction of RA. Different pre-annealing treatments were implemented to obtained Cr/Mn-enriched carbides, which act as reservoir phase due to their slow decomposition kinetics. The carbides utilize localized chemical gradient of Cr and Mn during the austenitization in press hardening, thereby effectively enhancing austenite stability. Consequently, both film-like and core-shell RA were observed in microstructure after die quenching, leading to a significant increase in the volume fraction of RA in PHS. The influence of type and size of Cr/Mn-enriched carbide on the RA in PHS was comprehensively investigated.
Published Version
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