软接触结晶器电磁连铸中初始凝固的基础研究

通过实验和数值模拟研究了软接触结晶器电磁连铸传热凝固特点，测定了金属Ｓｎ在连铸中的温度场，初始凝固点和坯壳厚度，得到了电磁场影响它们的基本规律。在数学模型中考虑了高频电磁场对金属的传热凝固的以下影响；（１）对结晶器的感应加热；（２）对金属的加热；（３）电磁力推斥液力金属，减少金属与结晶器壁接触的影响。

STUDY OF INITIAL SOLIDIFICATION IN SOFT CONTACT ELECTROMAGNETIC CONTINUOUS CASTING

The heat transfer and initial solidification in electromagnetic soft contact continuous casting have been investigated experimentally and numerically. The temperature field, starting point of solidification and shell thickness of Sn round billet during the continuous casting were measured. In the mathematical model, the following factors were taken into account: (1) heat induced in the mold and in the metal due to the electromagnetic field; (2) increase in heat resistance on the interface between the mold and the metal owing to the electromagnetic force. The influence of heat transfer and solidification on surface quality of billet was also analyzed. It is shown that with electromagnetic field, the temperature of the liquid metal was homogenized, the starting point of initial solidification was lower, the shell thickness was smaller, and the surface quality of the billet was improved obviously. In addition, it seems that in the case of Sn, among the three effects of the electromagnetic field, that is, producing heat in the mold, and increasing heat resistance on the interface due to the electromagnetic force, producing heat in the metal,the former two have greater influence on the heat transfer and solidification of the metal.