To apply the duplex type low-carbon medium-manganese steel to hot/warm-forging and -stamping products, influence of cooling process routes immediately after intercritical annealing such as air-cooling (AC) isothermal transformation (IT) processes on impact toughness 0.2%C-1.5%Si-5%Mn (in mass %) medium-Mn (D-MMn) was investigated. Moreover microstructural tensile properties were also The AC inc...

TRIP-assisted C-Si-Mn steels are usually subjected to austempering with a preliminary intercritical annealing that is targeted at the multi-phase structure 40–60 vol.% of proeutectoid ferrite. The kinetics and mechanism phase-structural transformations can be impacted due additional alloying steel by strong carbide forming elements, thus necessitating an alternative approach for selection param...

In the present paper, medium-C Si-rich steel with a quenched martensite microstructure was heated to intercritical annealing temperatures at 750 °C, 760 °C and 770 after warm rolling deformation obtain ferrite varying volume fractions. Subsequently, bainite/ferrite multiphase microstructures were attained via austempering near Ms temperature. The of test different heat treatments characterized ...