拉速对小薄板坯连铸结晶器内温度、溶质及夹杂物分布的影响
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摘要
采用数值模拟的方法,建立了140 mm×35 mm小薄板坯连铸过程的流场-温度场-溶质场-夹杂物的耦合数学模型,分析了拉速对结晶器内温度、溶质以及夹杂物分布的影响规律。结果表明,结晶器内溶质富集在固液两相区,在液相中逐渐降低,随着拉速增大,偏析最严重的区域向结晶器窄面靠近;夹杂物的体积分数、数量密度分布与结晶器内钢液的速度分布基本一致,在钢液流动方向上较高,在液相中不断降低。随着拉速增大,出口处夹杂物体积分数与数量密度变大,距离中心对称面越近,夹杂物体积分数与数量密度变化越显著。
The coupling mathematical model of flow field, temperature field, solute field and inclusion in the continuous casting process of 140 mm×35 mm thin slab was established by means of numerical simulation. The results show that the solute concentration in the crystallizer is in the solid-liquid two-phase region, and it decreases gradually in the liquid phase.With the increase of the drawing speed, the most severe segregation area is close to the narrow surface of the crystallizer.The distribution of volume fraction and quantity density of inclusions is basically consistent with the velocity distribution of molten steel in the crystallizer. With the increase of the drawing speed, the integral number and quantity density of the inclusion at the exit become larger, and the closer to the central symmetry plane, the change of the integral number and quantity density of the inclusion becomes more significant.
The coupling mathematical model of flow field, temperature field, solute field and inclusion in the continuous casting process of 140 mm×35 mm thin slab was established by means of numerical simulation. The results show that the solute concentration in the crystallizer is in the solid-liquid two-phase region, and it decreases gradually in the liquid phase.With the increase of the drawing speed, the most severe segregation area is close to the narrow surface of the crystallizer.The distribution of volume fraction and quantity density of inclusions is basically consistent with the velocity distribution of molten steel in the crystallizer. With the increase of the drawing speed, the integral number and quantity density of the inclusion at the exit become larger, and the closer to the central symmetry plane, the change of the integral number and quantity density of the inclusion becomes more significant.
引文
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[2]Quan YUAN,Sivaraj Sivaramakrishnan,Brian G.Thomas.Comparison of four methods to evaluate fluid velocities in a continuous slab casting mold[J].ISIJ International,2001,41(10):1262-1271.
[3]Lei Hong,Wang Lianze,Wu Ziniu,et al.Collision and coalescence of alumina particles in the vertical[J].ISIJ International,2002,42(7):717-725.
[4]雷洪,张红伟,陈芝会,等.连铸结晶器内钢液流动、凝固和夹杂物的分布[J].钢铁,2010,45(5):24-29.
[5]Geng Dianqiao,Lei Hong,He Jicheng,et al.Numerical simulation for collision and growth of inclusions in ladles stirred with different porous plug configurations[J].ISIJ International,2010,50(11):1597-1605.
[6]Hong LEI,Yan ZHAO,Dianqiao GENG.Mathematical model for cluster-inclusion's collision-growth in inclusion cloud at continuous casting mold[J].ISIJ International,2014,54(7):1629-1637.
[7]Zhang L,Taniguchi S,Cai K.Fluid flow and inclusion removal in continuous casting tundish[J].Metallurgical&Materials Transactions B,2000,31(2):253-266.
[8]Ren Y,Wang Y,Li S,et al.Detection of non-metallic inclusions in steel continuous casting billets[J].Metallurgical and Materials Transactions B,2014,45(4):1291-1303.
[9]Ling H,Zhang L.Numerical simulation of the growth and removal of inclusions in the molten steel of a two-strand tundish[J].JOM:the journal of the Minerals,Metals&Materials Society,2013,65(9):1155-1163.
[10]方庆.大方坯连铸过程流动、传热、传质行为及凝固组织的模拟研究[D].武汉:武汉科技大学,2018.
[11]Qing F,Hongwei N,Bao W,et al.Effects of EMS induced flow on solidification and solute transport in bloom mold[J].Metals,2017,7(3):72.
[12]Bennon W D,Incropera F P.A continuum model for momentum,heat and species transport in binary solid-liquid phase change systems-I.Model formulation[J].International Journal of Heat and Mass Transfer,1987,30(10):2161-2170.
[13]唐家鹏.ANAYS FLUENT 16.0超级学习手册[M].北京:人民邮电出版社,2016.
[14]Lei H,Geng D Q,He J C.A continuum model of solidification and inclusion collision-growth in the slab continuous casting caster[J].Transactions of the Iron&Steel Institute of Japan,2009,49(10):1575-1582.
[15]张红伟,王恩刚,赫冀成.方坯连铸过程中钢液流动、凝固及溶质分布的耦合数值模拟[J].金属学报,2002(1):99-104.
[16]董鹏莉,尚海霞,王华.铸坯及板卷典型质量缺陷成因与控制技术[J].中国冶金,2017,27(6):7-13.
[17]张琦,吴滟帮,李欢.内置式搅拌磁场对连铸空心铸坯内夹杂物分布影响[J].铸造技术,2018,39(1):111-115,119.
[18]王月,艾新港,李胜利,等.拉速对板坯结晶器钢液流动及夹杂物运动影响的数学模拟[J].辽宁科技大学学报,2015,38(6):412-417.
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