Improvement of edge crack damage of magnesium alloy by optimizing the edge curve during cross variable thickness rolling

Abstract

According to the MAS rolling and cross rolling theory, the hot rolling experiments were carried out on the AZ31 magnesium alloy specimens at the initial rolling temperature of 350 °C, and the grain distribution and edge damage of the strip after rolling by a controlled rolling reduction in different regions were analyzed. Meanwhile, the edge curves were designed to improve the edge crack and grain refinement of magnesium alloy during cross variable thickness rolling. The results indicated that the variable thickness rolling with the edge curve could effectively reduce the edge crack of magnesium alloy. The results also indicated that different edge curves could produce varying degrees of grain refinement at the strip edge and realize the ideal grain refinement in different regions during the rolling process; meanwhile, the optimization of the edge curve during cross variable thickness rolling could provide a theoretical basis for improving the magnesium alloy edge crack.