双辊薄带铸轧凝固组织数值模拟  

Numerical Modeling of Solidification Structure of Twin-roll Casting-rolling Thin Strip

作　　者：张冬晓[1] 常庆明[1] 潘成刚[1] 张诗昌[1] 吴志芳 贺铸[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室

出　　处：《特种铸造及有色合金》2015年第6期585-589,共5页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51074116;51375353);湖北省教育厅科学技术研究计划重点资助项目(D20101110)

摘　　要：基于ProCast的元胞自动机(Cellular Automaton)-有限元(Finite Element)模型,以Si含量为6.5%的高硅电工钢为研究对象,建立了双辊薄带铸轧凝固组织演变模型,探讨了过热度、铸轧速度、铸辊表面与钢液间的传热系数等因素对薄板凝固组织的影响。结果表明,浇注温度越高,晶粒尺寸越大,柱状晶比例也越大。钢液浇注过热度过高,会使凝固区变小,有漏钢的危险。钢液浇注温度过低,凝固区域变厚,容易导致铸轧事故。随着铸轧速度提高,晶粒尺寸减小,柱状晶比例也减小。铸轧速度过低或过高,均容易导致铸轧事故。晶粒尺寸随着传热系数的增大而增大,柱状晶比例也随着传热系数的增大而增大。Based on a cellular automaton（CA）- finite element（FE） model in the ProCast, a model for ana- lyzing microstructure of twin roll thin strip casting was established for high silicon electrical steel with 6.5 % Si content. Influences of superheat, roll casting speed, heat transfer coefficient on thin strip solidi- fication microstructure were described. The results reveal that with increasing in pouring temperature, grain size is coarsened with the increase of columnar grain content. Excessive superheating degree of liq- uid steel can narrow the solidification zone, which can play possible liquid-steel leakage. With increasing in roll-casting speed, the grain size is refined with the decrease of columnar grain content. A lower roll- casting speed easily takes the roll-casting accident, while a higher roll-casting speed can lead to the pos- sible liquid steel leakage. As the increase of heat transfer coefficient, grain size and columnar grain con- tent are increased.

关 键 词：双辊连铸 凝固组织 元胞自动机 数值模拟 

分 类 号：TG335.9[金属学及工艺—金属压力加工]