软接触结晶器电磁连铸中初始凝固的基础研究  

STUDY OF INITIAL SOLIDIFICATION IN SOFT CONTACT ELECTROMAGNETIC CONTINUOUS CASTING

作　　者：任志鸣 董华锋[1] 邓康[1] 蒋国昌[1] 

机构地区：[1]上海大学上海市钢铁冶金新技术应用开发重点实验室,上海200072

出　　处：《金属学报》1999年第8期851-855,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59734080;上海市科学技术委员会重点课题

摘　　要：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传热凝固的以下影响：（1）对结晶器壁的感应加热；（2）对金属的加热；（3）电磁力推斥液体金属，减少金属与结晶器壁接触的影响，结果表明，在电磁场的作用下，液相区内的金属温度趋于均匀，初始凝固点位置降低，初生坯壳厚度变薄，铸坯表面质量明显改善；在连铸Sn中，电磁场加热结晶器壁和电磁力减少金属与结晶器壁的接触，增加界面热阻，对连铸传热和凝固的影响。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.

关 键 词：连铸 电磁连铸 凝固 传热 结晶器 软接触 

分 类 号：TF777[冶金工程—钢铁冶金]