Abstract
The microstructure and the mechanical properties of the low carbon high strength (LCHS) Mn–Si–Cr steel treated by the novel quenching and dynamic-partitioning (QDP) process are investigated in detail. All samples exhibit a better performance of tensile strength and impact toughness compared with conventional LCHS steels. The higher impact toughness is closely related to the stability of retained austenite (RA), which is determined by the morphology and the carbon content. The filmy RA between martensite laths as well as the nano-sized RA inside martensite laths can effectively improve toughness. The crystallographic features of the RA are studied in depth and the crystal plane indices of facets are accurately characterized. The near-coincidence-sites (NCS) model is applied to further analyze the interfacial structures of the nano-sized RA in the given orientation relationship. The observed facets tend to contain the high-planar density of NCS clusters. The study provides some references for the research on the phase transformation of high-strength steels.
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