Deformation during multipass rolling of commercial-purity aluminium

Abstract

Experiments have been conducted to investigate the structural events occurring during multipass rolling. It is shown that there is considerable substructural variation in rolled slabs which decreases with increasing deformation. Deformation banding is a common feature in the rolled product and this feature also is more prevalent in those slabs subjected to multiple passes rather than a single pass. It is suggested that this feature may be important in any subsequent annealing process. Recrystallization and subgrain growth between passes are investigated, and it is concluded that the latter will always occur and that recrystallization will occur under certain conditions. Finally, the effect of interpass time on the rolling load is discussed, and it is concluded that existing theories cannot predict loads in passes where plane strain conditions do not exist.