Numerical simulation of stress and strain in cast-rolling of AZ31 magnesium alloy

A numerical simulation of a two-roll continuous casting machine has been performed. The influence of the key process parameters on the position of the end of solidification (called here solidification welding point: SWP), and on the stress state in the solidified strip have been analyzed. The stress and strain distribution in the rolling stage and the mechanism of the change of thermal stresses caused by air cooling on the edge crack were analyzed by the structural simulation in the plastic forming stage. The results show that the cracking tendency is the smallest when the cast-rolling temperature is 930 K, the heat transfer capacity of the roll is 3000 W/(m 2 K) and the cast-rolling speed is 3.2 m/min. The equivalent strain at the edge of the cast-rolled sheet is higher than that in the middle, and cracks are more likely to occur. After passing through the roll gap, the thermal stress changes through three stages: transient, transition and stability, and the shrinkage along the width direction is much larger than that in the thickness direction.