A MODEL FOR RECRYSTALLIZATION KINETICS, TEXTURE AND GRAIN-SIZE APPLIED TO MULTIPASS HOT-ROLLING OF AN ALMGMN ALUMINUM-ALLOY

A physically based model for primary recrystallisation, including recr ystallisation kinetics, grain size and texture evolution, during hot r olling of aluminium is presented. The model is based or? extensive exp erimental investigations that have been directed towards identifying t he nature of the nucleation sites for recrystallised grains of differe nt crystallographic orientations, Particle stimulated nucleation and n ucleation from cube bands and grain boundary regions have been incorpo rated in the model. The model has been applied to the hot rolling of a n AlMgMn alloy processed in 13 passes, Reasonable model predictions ha ve been obtained for cases of reversing rolling and a 3-stand tandem m ill, including variations in the exit gauge temperature.