Abstract
This study investigates whether the transformation-induced plasticity (TRIP) of metastable retained austenite, and a finely dispersed MA-like phase (narrow-lath martensite-retained austenite complex phase), produced by the addition 1.5%Si or 1.5% Si-1.0%Cr (mass%) can improve the cold formability of 22MnB martensitic sheet steel. The best combination of tensile strength and formability was achieved with 22SiMnCrB steel that was subjected to isothermal transformation at a temperature between 25 and 250°C after austenitizing. This optimal combination is attributed to strain-induced transformation of metastable retained austenite in the MA-like phase, which subsequently leads to plastic relaxation of localized stress concentrations.
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