Effects of Roll Speed and Pouring Temperature on Vertical Twin Roll Casting of Aluminum Alloy A6061

This paper reports on the vertical twin roll casting of aluminum alloy A6061. In this study, thin sheets of aluminum alloy A6061 were produced using the same equipment used for rolls made of copper alloy, which has high thermal conductivity and high strength. The effects of roll peripheral speed and pouring temperature on the continuity, surface properties, and thickness of the sheets were investigated and evaluated by microstructure observation and Vickers hardness tests. As a result, continuous thin plate fabrication was possible under all conditions, and the surfaces of all sheets consisted of smooth and uneven areas. The smooth areas were transferred to the roll surfaces, indicating that the roll surfaces were in good contact with each other. The area occupied by the smooth area on the thin plate surface tended to increase when the roll peripheral speed was low. The microstructure observation results showed that no central segregation was observed under all conditions, and that grain refinement occurred under the low speed condition.