C45Cr钢连铸大断面圆坯凝固过程数学模拟  

Mathematical Simulation on Solidification Process of Large Round Billet of C45Cr Steel in Continuous Casting

作　　者：孙涛[1] 岳峰[1] 郭春[1] 李瑛 马忠存 郭鑫 

机构地区：[1]北京科技大学冶金工程研究院,北京100083 [2]北满特殊钢有限公司,黑龙江齐齐哈尔161041

出　　处：《铸造技术》2015年第7期1820-1825,共6页Foundry Technology

摘　　要：通过控制大断面圆坯的凝固过程控制最终连铸坯质量,基于薄片移动边界法建立了连铸大断面圆坯的凝固传热数学模型。应用Pro CAST软件对C45Cr钢、直径为准650 mm连铸圆坯凝固过程进行了数学模拟,计算出大断面圆坯凝固过程的温度场,并且得到铸坯的固相率分数与液芯长度。模拟结果表明,铸坯表面温度模型预测结果与工业试验测温结果吻合很好,所以此数学模型计算结果能够准确地反映实际情况。讨论了过热度、拉速、二冷强度等因素对大断面圆坯表面温度、中心温度、固相率分数以及液芯长度的影响,为连铸工艺参数的优化及凝固末端电磁搅拌位置的确定提供了有效指导。In order to control the final quality of casting billet by controlling solidification process of the large round billet, a mathematical model based on slice moving method was developed for the solidification and heat transfer process of the large round billets. A mathematical simulation was done using the ProCAST software for the solidification process of the 650 mm round billets of C45Cr steel, and its temperature field, solid fraction and liquid core length of large round billet during solidification were calculated. The simulation results show that the predicted billet surface temperature is in accordance with testing results of industrial experiments, so the mathematical model can reflect the real situation accurately. Also the influence of superheat, drawing velocity and secondary cooling intensity on large round billet surface temperature, core temperature, solid fraction and liquid core length was discussed, which provide an effective guidance for the optimization of continuous casting process parameters and the location of final electromagnetic stirring.

关 键 词：C45Cr钢 大断面圆坯 凝固 温度场 数学模拟 

分 类 号：TG244.3[金属学及工艺—铸造]