针对薄板坯平行板型连铸结晶器, 建立了Fe--C二元合金紊流流动、凝固及溶质传输的三维耦合数学模型; 并与水口模拟计算相结合, 计算、分析了薄板坯平行板型结晶器内钢液的紊流流动、凝固及溶质分布. 计算结果表明, 由于薄板坯厚度尺寸限制, 钢液液流冲击深度相对传统板坯明显减小, 出水口射流对窄壁的冲击减弱, 而对铸坯宽面的冲刷加强. 出结晶器后,钢液流动变为向下的均匀平推运动. 在结晶器出口处,由于钢液流动、凝固及溶质传输的相互作用,使得铸坯宽面靠近窄壁处的凝固壳厚度最薄, 并在此处产生溶质分布强烈变化, 易导致拉漏缺陷.
Based on the control-volume method a 3-D comprehensively coupled model has been developed for binary iron-carbon to describe the turbulent fluid flow, heat transfer, solidification, and solute redistribution in the thin slab continuous casting process. The calculated results show that the turbulent fluid flow dramatically alters the shape of the isotherms and the distribution of the solute in the thin slab. The thickness of solidified shell is uneven along broad face because of the flow jet. The formation mechanism of macrosegregation is investigated and the possible position of the macrosegregation is analyzed.
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