Abstract:

:The 7075/6009 composite ingots with diameter of 65 mm were prepared by double-stream-pouring continuous casting. The effect of processing parameters on the thickness of outer layer of 7075/6009 composite ingot was analyzed. The results show that the melt temperature in the inside ladle, the depth of the submerged entry nozzle in the mold and the diameter of the throttle bore remarkably affect the thickness of outer layer of the composites, when the temperature of the melt in the inside ladle increases from 680℃ to 780℃ , the thickness of outer layer reduced by 38.8% ; when the depth of the submerged entry nozzle in the mold increases from 0mm to 15mm, the thickness of outer layer increases by 37% ; when the diameter of the throttle bore increases from 1.6 mm to 1.8 mm, the thickness of outer layer decreased 42.2%. However, the parameters, such as the melt temperature in the outside ladle and casting speed, have little effect on the thickness of outer layer. This paper also analyzed the shape of the liquid pool during the double-stream-pouring semi-continuous casting. The role of the processing parameters in double-stream-pouring continuous casting was analyzed based on the shape variation of liquid pool.