微合金钢连铸方坯凝固传热过程数值模拟  

Numerical modelling on solidification and heat transfer process of micro-alloyed steel bloom

作　　者：蔡大为 陆靖洲 窦坤 潘伟明 CAI Dawei;LU Jingzhou;DOU Kun;PAN Weiming(Xiangjiang Laboratory,Changsha 410205,Hunan,China;Technology Research Institute,Hunan Iron and Steel Group,Changsha 410004,Hunan,China;School of Metallurgy and Environment,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]湘江实验室,湖南长沙410205 [2]湖南钢铁集团技术研究院,湖南长沙410004 [3]中南大学冶金与环境学院,湖南长沙410083

出　　处：《连铸》2023年第5期51-56,共6页Continuous Casting

基　　金：国家重点研发计划重点专项资助项目(2021YFB3702400);北京科技大学钢铁冶金新技术国家重点实验室开放基金资助项目(K22-07);湘江实验室重大资助项目(22XJ01002)。

摘　　要：针对微合金钢方坯连铸过程拉速波动大,二次冷却区水量分配均匀性低的实际问题,本文运用有限元法建立了针对目标钢种连铸过程的二维非稳态凝固传热数学模型。在计算相图技术的基础上首先明确了覆盖连铸全流程温度范围内的钢种热物性参数变化规律与凝固特性,并以此为输入参数,结合实际连铸过程工艺参数进行了计算求解,定量化分析了浇铸温度、拉速对铸坯凝固传热过程的影响。结果表明,相对于拉速,浇铸温度的提高对铸坯表面温度的影响不大。当拉速从0.50 m/min提高到0.55、0.60 m/min时,矫直点处铸坯宽面中心温度依次提高33.7、28.6℃,角部温度依次提高21.8、19.1℃,但回温过大的现象依然存在,需要进一步通过调整水量分配的研究来改善。Aiming at the realistic issues of large variations in casting speed as well as the non-uniform distribution in secondary cooling water,a finite element mathematical model for non-steady state solidification and heat transfer in two-dimensions was established based on the main technical parameters of a micro-alloyed as-cast steel bloom caster.The thermo-physical parameters and solidification characteristics for the target steel was determined using CALPH-AD approach.The effects of casting temperature and casting speed on solidification process were discussed by calcu-lated on this basis.The results showed that the increase of casting temperature had relatively small impact on the surface temperature of billet.The center temperature in width increased successively 33.7,28.6℃,and the corner temperature increased 21.8,19.1℃ along with the casting speed increased from 0.50 m/min to 0.60 m/min.Fur-ther research on adjustment of water distribution need to be conducted to improve the phenomenon that excessive temperaturerecoverystill existed.

关 键 词：连铸 微合金钢 有限元 凝固传热 数值模拟 

分 类 号：TF777[冶金工程—钢铁冶金]