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Dynamic recovery and the following static recrystallization process of 1.8% Al steel were investigated by a hot compression machine equipped with a precise control system for quenching after hot deformation. The temperatures and strain rates of deformations were varied in the ranges from 800 to 1 100°C, and from 5×10-4 to 10.3s-1, respectively. The subgrain structures developed by dynamic recovery process were observed by interference microscope and transmission electron microscope, and these were correlated with steady state flow stress. The substructural changes in static recovery and recrystallization after dynamic recovery were investigated to understand the nucleation mechanism of static recrystallization after dynamic recovery. Subgrain coarsening at a high rate took place in the recovery stage, and subgrain coalescence along the grain boundary appeared to be the nucleation mechanism of recrystallization. The effects of hot deformation conditions on static recrystallization kinetics were also studied and analyzed based on grain boundary migration rate.

Dynamic recovery and static recrystallization of 1.8% Al steel in hot deformation.