双辊铸轧薄带过程中铸速对熔池内温度场的影响

采用三维流热耦合有限元分析对双辊铸轧不锈钢过程进行模拟,利用反向方法处理铸辊与熔池之间的换热边界条件,研究发现,随着铸轧速度的提高,铸带与铸辊之间的热传导系数增大,凝固终了点位置向铸机出口移动,铸带的表面和中心温度都有所升高,熔池表面温度略有增加.在水口尺寸一定的情况下,铸轧速度过小,铸带横向温差较大.铸轧速度是调节熔池液面高度和轧制力的有效手段.

Influence of Casting Speed on Temperature Field in Molten Pool During Twin-Roll Strip Casting

Based on a 3D finite element analysis of thermally coupled flow modeling the twin-roll strip casting of stainless steel,the boundary conditions of the heat exchange between rolls and molten pool are analyzed inversely.The result shows that the thermal conductivity between rolls and molten pool increases with casting speed,and the solidifying end-point moves to the exit of casting mill.Moreover,the surface and center temperatures of strip both increase and the surface temperature of molten pool slightly increases.With the size of submerged nozzle kept constant,a higher lateral temperature difference will be observed on the strip if the casting speed is too low.So,the casting speed plays an efficient role in readjusting the molten steel surface level in pool and rolling force.