ABSTRACT

To investigate the effect of soft reduction on the centre macrosegregation during the continuous casting process, a mathematical model coupling flow, solidification and species transfer was developed. Moreover, a soft reduction model had been incorporated into the coupling model. The solidification model was validated by methods of the billet surface temperature measurement and the tracer experiment. The predicted results revealed that the carbon enrichment occurred at the solidification front during the solidification process of the molten steel. The centre segregation ratio was 1.2 in the billet centre without soft reduction. The calculation results and experimental results showed that the centre segregation ratio at the centre solidification fraction of 0.3 with soft reduction was 1.11 and 1.09, respectively. The experimental results with the soft reduction at the centre solidification fraction of 0.3 had a good agreement with the calculation results.

摘要

为了研究在连铸过程中软压下对中心宏观偏析的影响，建立了一个耦合流动、凝固和物质转移的数学模型。此外，在耦合模型中加入了软缩减模型。采用钢坯表面温度测量和示踪实验等方法对凝固模型进行了验证。预测结果表明，在钢水凝固过程中，碳富集发生在凝固前沿。未经软压下的钢坯中心偏析率为1.2。计算结果和实验结果表明，软压下中心凝固分数为0.3时的中心偏析率分别为1.11和1.09。