MODELING RECRYSTALLIZATION KINETICS, GRAIN SIZES, AND TEXTURES DURINGMULTIPASS HOT-ROLLING

A physically based model for the evolution of recrystallization micros tructures and textures during hot rolling of aluminum is presented. Th e approach taken differs from similar models developed for steels. The present model is based on recent experimental investigations directed toward identifying the nature of the nucleation sites for recrystalli zed grains of different crystallographic orientations. Particle stimul ated nucleation (PSN) and nucleation from cube bands and grain boundar y regions have been incorporated in the model. The multipass aspect co mplicates the modeling due to partial recrystallization between the ro lling passes. Two different approaches have been suggested to handle t his. The model has been applied to predictions of recrystallization ki netics, recrystallized grain sizes, and recrystallization textures dur ing multipass hot rolling of aluminum. The predictions are reasonable compared to experimental results.