内置式搅拌磁场对连铸空心铸坯内夹杂物分布影响
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摘要
耦合求解了电磁场方程以及夹杂物守恒方程,考虑了夹杂物间的湍流碰撞以及斯托克斯碰撞,计算获得了拉速以及行波式电磁搅拌对结晶器内夹杂物分布的影响规律。结果表明,结晶器内夹杂物的运动规律与钢液的流动状态密切相关,拉速越大,钢液的浸入深度越深,则结晶器出口处夹杂物的数量越多,夹杂物的尺寸越小。施加行波式搅拌磁场可以使钢液流动加强,并减小钢液的浸入深度,有利于夹杂物的聚集长大上浮,结晶器内夹杂物的尺寸较大,但数量减少。因此,在连铸空心管坯内部施加搅拌磁场有利于去除钢中夹杂物,从而改善连铸空心管坯的质量。
The effect of the stirring electromagnetic field in the internal mold on the inclusions during the hollow billet continuous casting was analyzed with numerical simulation method, and the electromagnetic field equation and mass-population conservation equation of inclusions were established, and the turbulent collision and stokes collision between inclusions were considered. The results show that the inclusions in the crystallizer motion law is closely related to the flow of the molten steel, drawing speed, the greater the immersion depth of the molten steel, the large number of inclusions will be gathered at the outlet of the crystallizer, and the size of the inclusions is smaller. Travelling wave type stirring magnetic field can make the molten steel flow, and reduce the size of the immersion depth of the molten steel, it is advantageous to the inclusion of gathered grew up and rising, the inclusions size is larger in the crystallizer, but the quantity is few. Therefore, it is advantageous to apply the stirring magnetic field inside the hollow tube billet to remove the inclusions in the steel, thus improving the quality of the hollow tube billet.
The effect of the stirring electromagnetic field in the internal mold on the inclusions during the hollow billet continuous casting was analyzed with numerical simulation method, and the electromagnetic field equation and mass-population conservation equation of inclusions were established, and the turbulent collision and stokes collision between inclusions were considered. The results show that the inclusions in the crystallizer motion law is closely related to the flow of the molten steel, drawing speed, the greater the immersion depth of the molten steel, the large number of inclusions will be gathered at the outlet of the crystallizer, and the size of the inclusions is smaller. Travelling wave type stirring magnetic field can make the molten steel flow, and reduce the size of the immersion depth of the molten steel, it is advantageous to the inclusion of gathered grew up and rising, the inclusions size is larger in the crystallizer, but the quantity is few. Therefore, it is advantageous to apply the stirring magnetic field inside the hollow tube billet to remove the inclusions in the steel, thus improving the quality of the hollow tube billet.
引文
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[2]Medovar L B,Stovpchenko A P,Fedorovskii B B,et al.Possibility of combining electroslag remelting and continuous casting for the production of hollow ingots[J].Russian Metallurgy(Metally),2012,6:484-487.
[3]郭庆涛.铝合金高频磁场电磁净化试验研究[D].大连:大连理工大学,2005.
[4]王亚男,陈莹,李立勋.电磁制动对SPHC钢连铸坯中夹杂物的影响[J].铸造技术,2016,37(4):744-748.
[5]马国军,茅洪祥,陈崇峰.连铸结晶器电磁搅拌对夹杂物的影响[J].云南冶金,2000,29(2):50-53.
[6]廖亚莉,姚宇峰.鞍钢结晶器电磁搅拌技术应用分析[J].铸造技术,2013,34(6):723-725.
[7]Zhang Qi,Li Tingju,Wang Tongmin,et al.Effects of AC magnetic field on solidification structure of continuously cast hollow billet[J].Ironmaking&steelmaking,2009,36(2):115-119.
[8]张琦,李廷举,王同敏,等.连铸空心管坯内置行波磁场对凝固组织的影响[J].稀有金属材料与工程,2007,36(9):1566-1569.
[9]Lifeng Zhang,Shengqian Wang,Anping Dong,et al.Application of electromagnetic(EM)separation technology to metal refining processes:A Review[J].Metallurgical and Materials Transactions B,2014,45B:2153-2185.
[10]Lifeng Zhang,Yufeng Wang.Modeling the entrapment of nonmetallic inclusions in steel continu ous-casting billets[J].JOM,2012,64(9):1063-1074.
[11]吴狄峰.大方坯结晶器内钢液流动、传热、夹杂物运动以及电磁制动研究[D].北京:北京科技大学,2008.
[12]Zhongqiu Liu,Linmin Li,Baokuan Li,et al.Large eddy simulation of transient flow,solidification,and particle transport processes in continuous-casting mold[J].JOM,2014,66(7):1184-1196.
[13]Zhongqiu Liu,Linmin Li,Baokuan Li.Large eddy simulation of transient flow and inclusions transport in continuous casting mold under different electromagnetic brakes[J].JOM,2016,Published online.
[14]Brian G.Thomas,Quan Yuan,Sana Mahmood,et al.Transport and entrapment of particles in steel continuous casting[J].Metallurgical and materials transaction B,2014,45B:22-35.
[15]Hong Lei,Dianqiao Geng,Jicheng He.A continuum model of solidification and inclusion collision-growth in the Slab Continuous Casting Caster[J].ISIJ International,2009,49(10):1575-1582.
[16]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.
[17]吴炳胜,傅彦棉,田倩影,等.新型水口作用下的结晶器流场数值模拟[J].铸造技术,2015,36(3):763-766.
[18]裴红彬.电磁搅拌下圆坯结晶器内夹杂物运动行为研究[D].昆明:昆明理工大学,2012.
[19]卢志文,陈雷.电磁搅拌对钢锭(坯)中夹杂物的影响[J].钢铁研究,1990(4):30-34.
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