Process design and prediction of mechanical properties of dual phase steels with prepositional ultra fast cooling

We investigate here the three-stage cooling process of dual phase (DP) steels with the prepositional ultra fast cooling (UFC) equipment, which is different with the DP production line, with UFC in the end. Two dimensional finite difference model (FEM) was used to calculate the temperature field during the cooling process and classical thermodynamic model is used to develop CCT diagram. The temperature field and phase transformation process are combined to predict the microstructure and the mechanical properties across the cross-section using the thermodynamic model and the empirical model. The experiments present good mechanical properties of DP steels, which proved the production of DP steels with the prepositional UFC equipment is feasible.