Feature of Recovery Kinetics in Cold-Drawn As-Hot-Rolled Si-Mn Dual-Phase Steels

By using TEM and tensile test, the feature of recovery kinetics in cold- drawn as-hot-rolled Si-Mn dual-phase steel was investigated. The results show that when the steel was heated for 30 min at≤500℃, only recovery process was occurred. Heated at 500℃, the activation energies of recovery process of the steels are 187.9kJ/mol(steel J) and 220.6kJ/mol(steel H) respectively. These values are close to the self-diffusional activation energy of iron in α-Fe(239.7kJ/mol). It is considered that the recovery process at this temperature is controlled by the self-diffusion of iron in α-Fe.