连铸结晶器内钢液流动、凝固和夹杂物的分布

来源期刊：钢铁2010年第5期

论文作者：雷洪 张红伟 陈芝会 王恩刚 赫冀成

文章页码：24 - 29

关键词：湍流； 凝固； 溶质输运； 夹杂物； 连铸结晶器

Key words：turbulent flow； solidification； solute transfer； inclusion； continuous casting mold

摘    要：建立并求解动量、热量和质量传输耦合模型,研究了连铸结晶器内钢液流动、传热、凝固、溶质输运和夹杂碰撞长大行为。数值结果表明连铸机内钢液温度、碳质量分数和夹杂物体积分数的空间分布与钢水流动特征相似,也可分为上下2个循环区。但是其分布具有各自的特点。在涡心处,钢液温度较低,碳质量分数较高,夹杂物体积分数和数量密度较低。在弯月面处,钢液温度较低,碳质量分数较高,夹杂物的体积分数和数量密度较低。在结晶器出口处的凝固坯壳内,夹杂物的体积分数和数量密度分布极不均匀,存在阶跃现象,这与冲击点处凝固坯壳的重熔有关。

Abstract: A coupled mathematical model on moment,energy and mass transport was developed to investigate fluid flow,heat transfer,solidification,solute transfer and inclusion collision-growth in the continuous casting mold.Numerical results show that the temperature of molten steel,mass fraction of carbon and volume fraction of inclusion in the molten steel have the similar spatial distribution as the fluid flow in the continuous caster.Their spatial distributions can be divided into the upper and lower recirculation zones,but their distributions have their own characteristics.Near the center of the recirculation zones,the temperature of molten steel is lower,the mass fraction of carbon is higher and the volume fraction and number density of inclusion are lower.Near the meniscus,the temperature of molten steel,the volume fraction and number density of inclusion are lower,and the mass fraction of carbon is higher.Because the solidified shell is re-melted near the impinging point,there is the abrupt transition for the volume fraction and number density of inclusion in the solidified shell at the mold exit.