Due to their high strength, formability and affordable cost, quenched partitioned (Q&P) steels have shown the potential reduce mass of vehicles, thereby decreasing fuel consumption during service. Furthermore, because a lower steel is used in each vehicle, energy associated with steelmaking process also reduced. Q&P utilize deformation-induced martensitic transformation (DIMT) metastable retain...

The hot deformation behavior of a typical martensitic stainless steel containing 2.1% Ni was investigated by means of the compression test in the strain rate range of 0.001-1 s-1 and temperature range of 950-1150 °C. The flow behavior of the steel was evaluated using the flow stress curves and flow softening map and by microstructural investigation. Taking into account of the strain effect on t...

In this paper, a new approach is proposed for stress state - dependent flow localization in bifurcation failure model bounded through ductile damage in dynamically loaded sheets. Onset of localized necking is considered in phenomenological way for different strain rates to draw the forming limit diagram (FLD). Using a strain metal hardening exponent in the Vertex theory related to the strain ra...