连铸凝固传热时液相有效导热系数的定量化  

Quantification for effective thermal conductivity coefficient of melt during solidification and heat transformation of continuous casting

作　　者：孙海波[1,2] 李烈军[1] 程晓文 丘文生 曾令宇 张家泉[3] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640 [2]宝钢集团广东韶关钢铁有限公司炼钢部,广东韶关512123 [3]北京科技大学冶金与生态工程学院,北京100083

出　　处：《钢铁研究学报》2015年第5期35-41,共7页Journal of Iron and Steel Research

基　　金：中国博士后科学基金(2014M562176)

摘　　要：在已验证的电磁-热-溶质传输耦合模型的基础上,以某钢厂同时装配有M-EMS和F-EMS的方、圆坯先进铸机为研究对象,对二维切片凝固传热模型中液相有效导热系数的放大倍数m值进行了定量化研究。结果表明,溶质再分配作用下,方、圆坯凝固终点处的钢液液相线温度较浸入式水口入口处的分别约下降了23.27和5.54℃;与二维切片模型相比,采用耦合模型计算时,铸坯凝固终点位置分别后移了1.8和0.9m;为保证同时准确获取铸坯表面温度分布状态及其内部凝固终点位置,在本方、圆坯工况下,二维切片模型中纯液相和糊状区内液相有效导热系数放大倍数的推荐值范围分别为2.2-2.4和1.1-1.2。Based on the validated coupling model of electromagnetism, heat and solute transport, m （the magnifica- tion of effective thermal conductivity coefficient of melt used in model of 2I）-slice solidification and heat transfor- mation） was quantitatively investigated for an advanced caster with bloom and round bloom casting equipped with M-EMS and F-EMS simultaneously. The results show that liquidus temperatures of bloom and round bloom at the crater end are reduced by 23.27 and 5.54 ℃ respectively due to solute redistribution as compared to that of original molten steel at nozzle under the given bloom and round bloom casting cases. Compared with the 2D-slice model, the calculated liquid pool lengths are increased by 1.8 m （bloom） and 0. 9 m （round bloom） respectively when using the coupled model. Moreover, to exactly obtain the distribution of surface temperature of bloom and solidification end position simultaneously, the ranges of m for liquid and mushy zones used in the 2D-slice model are recommen- ded as 2.2-2.4 and 1.1-1.2 respectively.

关 键 词：连铸 凝固与传热 数值模拟 有效导热系数 

分 类 号：TG249.7[金属学及工艺—铸造]