二冷区辊式电磁搅拌的模拟研究
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摘要
利用ANSYS和CFX商业软件,对304不锈钢板坯连铸二冷区辊式电磁搅拌进行了模拟研究。结果表明,单向流动型搅拌时,板坯中心点磁感应强度最大,且频率每增加1 Hz,磁感应强度减小约2.92 m T;对于相向流动型搅拌,板坯断面中心线两端磁感应强度较大,中心点处最小;频率增加,板坯断面中心线上电磁力增大,且从3 Hz增加到7 Hz时,改变频率对电磁力的影响逐渐减弱;单向流动型搅拌时,板坯宽面中心截面形成两个对称分布的漩涡流场,对于板坯中心附近钢液,频率从3 Hz增加到7 Hz,流速增大约150 mm·s-1,坯壳厚度从30mm增加到50 mm,流速减小约60 mm·s~(-1);相向流动型搅拌时,板坯宽面中心截面形成四个漩涡流场,搅拌区域较小,强度较弱,对于板坯长度方向1/4附近钢液,频率从3 Hz增加到7 Hz,流速增大约180 mm·s-1;坯壳厚度从30 mm增加到50 mm,流速减小约70 mm·s~(-1)。
Second cooling segment with roller type electromagnetic stirring in 304 stainless steel continuous casting was simulated by commercial software ANSYS and CFX. The result shows that the maximum magnetic induction appears at the center of slab and decreases by about 2.92 m T for every 1 Hz increase when uni-directional flow forming-type stirring is adopted. For multi-directional flow forming-type stirring,the maximum magnetic induction appears at both ends of the slab cross section center line,while the magnetic induction is smallest at the center. Electromagnetic force at the slab cross section center line increases with the increasing current frequency,but the effect of changing frequency is weakened from 3 Hz to 7 Hz. For single directional flow forming-type stirring,center section on broad face of slab has two symmetrical flow fields,and the molten steel flow velocity near the center of slab increases by about 150 mm·s~(-1) from 3 Hz to 7 Hz,while reduces by about 60 mm·s~(-1) from 30 mm to 50 mm of shell thickness. On the contrast,the four vortex fields formed by multi-directional flow forming-type stirring are small and stirring intensity is weak,and the molten steel flow velocity near the 1/4 length of slab increases by about 180 mm·s~(-1) from 3 Hz to 7 Hz,while reduces by about70 mm·s~(-1) from 30 mm to 50 mm of shell thickness.
Second cooling segment with roller type electromagnetic stirring in 304 stainless steel continuous casting was simulated by commercial software ANSYS and CFX. The result shows that the maximum magnetic induction appears at the center of slab and decreases by about 2.92 m T for every 1 Hz increase when uni-directional flow forming-type stirring is adopted. For multi-directional flow forming-type stirring,the maximum magnetic induction appears at both ends of the slab cross section center line,while the magnetic induction is smallest at the center. Electromagnetic force at the slab cross section center line increases with the increasing current frequency,but the effect of changing frequency is weakened from 3 Hz to 7 Hz. For single directional flow forming-type stirring,center section on broad face of slab has two symmetrical flow fields,and the molten steel flow velocity near the center of slab increases by about 150 mm·s~(-1) from 3 Hz to 7 Hz,while reduces by about 60 mm·s~(-1) from 30 mm to 50 mm of shell thickness. On the contrast,the four vortex fields formed by multi-directional flow forming-type stirring are small and stirring intensity is weak,and the molten steel flow velocity near the 1/4 length of slab increases by about 180 mm·s~(-1) from 3 Hz to 7 Hz,while reduces by about70 mm·s~(-1) from 30 mm to 50 mm of shell thickness.
引文
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[2]尹永昌.板坯连铸辊式电磁搅拌的数值模拟[D].包头:内蒙古科技大学,2012.
[3]陈国威,李具中,刘光明,等.板坯连铸机辊式电磁搅拌的应用实践[J].武钢技术,2008,46(1):33-37.
[4]易兵,李爱武.辊式电磁搅拌器在板坯连铸二冷区上的应用[C]//全国炼钢-连铸生产技术会.唐山:中国金属学会,2014:512-519.
[5]TRINDADE L B,VILELA A C F,FILHO A F F,et al.Numerical model of electromagnetic stirring for continuous casting billets[J].IEEE Transactions on Magnetics,2002,38(6):3658-3660.
[6]刘洋,王新华.二冷区电磁搅拌对连铸板坯中心偏析的影响[J].北京科技大学学报,2007,29(06):582-585,590.
[7]LIU C T.Refined model development and performance assessment of a linear induction-type electromagnetic stirrer[J].IEEE Transactions on Magnetics,2010,46(10):3724-3730.
[8]OKADA N,TAKATANI K,HIRAKI S,et al.Method for continuous casting of steel and electromagnetic stirrer usable therefor[P].:EP 2269750,2011-05-01.
[9]李建超,尹永昌,王宝峰.连铸板坯二冷区辊式电磁搅拌器搅拌方式模拟[J].特种铸造及有色合金,2013,33(4):302-305.
[10]雷洪.结晶器冶金学[M].北京:冶金工业出版社,2011:8-25.
[11]任兵芝,朱苗勇,王宏丹,等.大方坯连铸结晶器电磁搅拌三维电磁场与流场的数值模拟[J].金属学报,2008,44(4):507-512.
[12]CHUNG S I,SHIN Y H,YOON J K.Flow characteristics by induction and gas stirring in ASEA-SKF ladle[J].ISIJ International,1992,32(12):1287-1296.
[13]SZEKELY J.Fluid flow phenomena in metals processing[M].New York:Academic Press,1979:175-203.
[14]YU H,ZHU M.Three-dimensional magnetohydrodynamic calculation for coupling multiphase flow in round billet continuous casting mold with electromagnetic stirring[J].IEEE Transactions on Magnetics,2009,46(1):82-86.
[15]LEI H,ZHU M Y,HE J C.Mathematical and physical modeling of interfacial phenomena in continuous casting mould with argon injection through submerged entry nozzle[J].Acta Metallurgica Sinica,2000,13(5):1079-1086.