Formable high-strength low-alloy TRIP-aided sheet steels with annealed martensite matrix or TRIP-aided annealed martensitic steel for automotive applications. Amount and shape of retained austenite. Comparison of the stability of austenite obtained after strain-induced transformation and present in conventional TRIP-aided dual-phase steel with polygonal ferrite matrix. Elongation and reduction of area. Stretch-flangeability and bendability.
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