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熔池与结晶辊接触界面的换热边界条件是制定双辊薄带铸轧工艺的重要参数。针对现有的换热数学模型不能合理描述铸轧开浇和稳定阶段接触界面的热交换问题,基于熔池边界层温度和凝固组织枝晶间距建立了接触界面的换热数学模型。以1Cr18Ni9Ti不锈钢为例,对铸轧稳定阶段的数学模型进行了计算,模型计算结果与试验结果相吻合,验证了本文所建立换热数学模型的准确性。研究结果表明,钢液与结晶辊初始接触时界面热流密度为26.06 MW·m-2,随着接触界面熔池边界层温度降低,凝固坯壳收缩,热流密度显著下降,在接近Kiss点区域时趋于稳定值。
Heat transfer boundary conditions between the weld pool and the crystallizing roll contact interface are important parameters for making a twin roll casting process. In view of the existing mathematical model of heat exchange, the heat exchange problem between the cast-in-casting and steady-state contact interface can not be reasonably described. Based on the temperature of the boundary layer in the molten pool and the dendritic spacing of the solidified structure, a mathematical model of heat exchange at the contact interface is established. Taking 1Cr18Ni9Ti stainless steel as an example, the mathematical model of the steady-state casting and rolling stage was calculated. The calculated results agree well with the experimental results, which verify the accuracy of the heat transfer mathematical model established in this paper. The results show that the interface heat flux density is 26.06 MW · m-2 when the molten steel contacts with the crystallization roller initially. With the decrease of the boundary layer temperature of the contact interface, the solidified shell shrinks and the heat flux decreases significantly. Stable value.