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根据钢铸态热膨胀特性及实际过程中钢的连铸工艺特点,建立基于凝固传热与自由热收缩耦合的自由热收缩有限差分计算模型。利用该模型系统研究了铸坯自由热收缩行为沿铸流上的分布以及不同钢种之间凝固自由热收缩行为。研究表明,铸坯在中心全液相、两相和全凝固阶段表现的自由热收缩行为呈现不同规律;不同钢种的凝固自由热收缩量沿拉坯方向上的分布也相应存在差异。该模型可为制定不同钢种和断面的连铸辊缝控制工艺与轻压下工艺提供理论依据。
According to the thermal expansion characteristics of steel as-cast and the continuous casting process of steel in the actual process, a finite difference model of free heat shrinkage based on the coupling of solidification heat transfer and free heat shrinkage is established. The model was used to study the distribution of free shrinkage along slab flow and the free shrinkage of solidification between different steel grades. The results show that the free shrinkage behavior of slab in the whole liquid phase, two phases and the whole solidification phase presents different laws. The distribution of free heat shrinkage of different steel grades along the drawing direction is also different. The model can provide theoretical basis for the development of continuous casting roll gap control and soft reduction processes with different steel grades and sections.