恒温出坯是实现连铸直轧的重要条件. 提出了基于电流加热恒温出坯方法, 并通过数值模拟验证了该方法的可行性. 结果表明: 高频电流产生的焦耳热对连铸坯起到了补热作用, 补热效果随电流频率的增加而增加, 随连铸坯移动速度的增加而减小; 电流产生的焦耳热能降低连铸坯径向和长度方向的温度梯度. 为了根据实际工况确定实现连铸恒温出坯所需的加热功率, 通过理论分析, 建立了连铸坯电流加热功率计算模型, 为数值模拟优化电流参数提供了理论依据.

Achieving homogenized temperature distribution in continuous casting billets is critical in the application of direct rolling. A method that reduced the temperature differences in a continuous casting billet using an electric current was proposed. Numerical simulations revealed that the Joule heat generated by an alternating current with high frequency could supply an external heating effect and improve the temperature distribution in the continuous casting billet. Results showed that this heating effect increased with an increase in the current frequency and decreased with an increase in the moving speed of the billet. In addition, it was shown that the Joule heat generated by the current could reduce the temperature gradient in both the radial and longitudinal directions of the continuous casting billet. A theoretical model was established to calculate the heating power required to generate homogenized temperature distribution in a continuous casting billet. This study provides a theoretical basis for optimizing current parameters in numerical simulations.