MICROSTRUCTURAL EVOLUTION OF INTERCRITICALLY ANNEALED MEDIUM-MANGANESE STEELS
Intercritical annealing (IA) of medium-Manganese (Mn) steels is an AHSS design concept for the production of formable sheet steel. The microstructure after IA includes retained austenite (5-40 volume pct), which forms from an initial microstructure of either cold-rolled ferrite or martensite, and is stabilized to room temperature via C and Mn enrichment. Retained austenite is essential to the elevated strength-elongation, and can be engineered with equilibrium modelling and judicious selection of alloy composition and heat treatment.Long IA times (i.e. batch annealing) are expected to result in ...
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