不同拉速对薄板坯凝固过程及组织的影响  

Effect of different pulling speed on the solidification process and microstructure of thin slab

作　　者：陈伟 常新年 杨改彦 王博 李耀 马国金 CHEN Wei;CHANG Xinnian;YANG Gaiyan;WANG Bo;LI Yao;MA Guojin(College of Metallurgy and Energy,North China University of Science and Technology University,Tangshan 063210,China;Hebei Key Laboratory of Modern Metallurgical Technology,High Quality Steel Continuous Casting Technology Innovation Center,Tangshan 063009,China;Qian’an College,North China University of Science and Technology,Tangshan 064400,China;Shougang Jingtang United Iron and Steel Co.,Ltd.,Tangshan 063200,China)

机构地区：[1]华北理工大学冶金与能源学院,河北唐山063210 [2]河北省现代冶金技术重点实验室,高品质钢连铸工程技术创新中心,河北唐山063009 [3]华北理工大学迁安学院,河北唐山064400 [4]首钢京唐钢铁联合有限责任公司,河北唐山063200

出　　处：《炼钢》2022年第1期56-62,共7页Steelmaking

基　　金：国家自然科学基金青年科学基金项目(52004093);河北省自然科学基金资助项目(E2020209036);唐山市科技局项目(20130213b)。

摘　　要：针对薄板坯在凝固过程中容易出现铸坯裂纹、疏松、缩孔等质量问题,以某厂生产的高拉速薄板坯为研究对象,通过建立传热凝固有限元和元胞自动机相结合的CAFE模型,基于ProCAST平台开展凝固传热全过程数值计算,探究不同拉速下的结晶器末端坯壳生长情况、不同拉速对凝固传热过程的温度场和三维凝固组织的影响。结果表明,在不同的拉速下,坯壳在结晶器内不同高度处的厚度差异逐步分化,越是接近结晶器下口,坯壳减薄越发明显。拉速每增加0.2 m/min,结晶器末端的坯壳厚度减薄约0.2 mm,凝固末端液相穴的长度增加0.3 m。拉速提高时,铸坯横截面上晶粒总数目会随之减少,平均晶粒面积也呈现出减少的趋势。Aiming at quality problems such as cracks,porosity and shrinkage of the thin slab during the solidification process,the thin slab with high casting speed produced by a factory was taken as the research object,and the CAFE model combining heat transfer and solidification finite element with cellular automata was established.The numerical calculation of the whole process of solidification and heat transfer was carried out based on ProCAST platform.The growth of the thin slab shell at the end of the mold under different casting speeds and the influence of different casting speeds on the temperature field and three-dimensional solidification structure were studied.The results showed that,under different casting speeds,the thickness difference of the blank shell at different heights in the mold gradually differentiated.The closer to the lower opening of the mold,the more obvious the shell became thinner.For every increase of 0.2 m/min in the casting speed,the thickness of the blank shell at the end of the mold reduced by about 0.2 mm,and the length of the liquid cavity at the end of the solidification increased by 0.3 m.When the casting speed increased,the total number of grains on the cross section of the cast slab would decrease,and the average grain area would also show a decreasing trend.

关 键 词：高拉速 薄板坯 传热凝固 CAFE 温度场 凝固组织 

分 类 号：TF777.7[冶金工程—钢铁冶金]