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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。
By controlling the solidification process of the large section billet, the quality of the final billet was controlled. A mathematical model of solidification and heat transfer was established based on the slice moving boundary method. Pro CAST software was used to simulate the solidification process of C45Cr steel and the diameter of 650 mm continuous casting round billet. The temperature field of solidification of large round billet was calculated and the solid fraction and wick length of the slab were obtained. The simulation results show that the prediction results of surface temperature model of slab agree well with the temperature measurement results of industrial test, so the calculation results of the mathematical model can accurately reflect the actual situation. The effects of superheat, pulling speed and secondary cooling strength on the surface temperature, center temperature, fraction of solid fraction and length of liquid core in large section billet were discussed. The optimization of continuous casting process parameters and the determination of the position of electromagnetic stirring at the end of solidification Provide effective guidance.