PMO作用下连铸二冷区电磁场-流场-温度场的数值模拟
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摘要
建立了在圆坯二冷区脉冲磁致振荡条件下电磁场-流场-温度场耦合数学模型.利用ANSYS有限元软件,研究了在脉冲磁致振荡凝固细晶(pulse magneto oscillation,PMO)作用下铸坯内部磁感应强度、电磁力以及焦耳热的分布,并且通过耦合电磁力与焦耳热得到了相应流场及温度场的变化规律.研究表明,当铸坯中施加脉冲磁致振荡作用时在电磁力的驱动下,铸坯内部靠近线圈位置将形成上下2个回流区,这种形式的流动能够降低铸坯的中心温度,使得铸坯内部的温度场分布更均匀,有助于晶粒细化.
A mathematical model that couples electromagnetic field, flow field and temperature field is established to study round billet secondary cooling zone under pulse magnetooscillation pulse magneto oscillation(PMO) using the finite element analysis software ANSYS. Billet internal magnetic flux density, electromagnetic force and Joule heat distribution are analyzed. Distribution of the flow field and temperature field are obtained according to the coupling electromagnetic force and Joule heat. The results show that an upper and lower recirculation zone is formed since a driving electromagnetic force is generated by pulse magneto-oscillation. The flow can reduce billet center temperature. As a result,the internal temperature distribution becomes more uniform, which is beneficial to grain refinement.
A mathematical model that couples electromagnetic field, flow field and temperature field is established to study round billet secondary cooling zone under pulse magnetooscillation pulse magneto oscillation(PMO) using the finite element analysis software ANSYS. Billet internal magnetic flux density, electromagnetic force and Joule heat distribution are analyzed. Distribution of the flow field and temperature field are obtained according to the coupling electromagnetic force and Joule heat. The results show that an upper and lower recirculation zone is formed since a driving electromagnetic force is generated by pulse magneto-oscillation. The flow can reduce billet center temperature. As a result,the internal temperature distribution becomes more uniform, which is beneficial to grain refinement.
引文
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[9]于海岐,朱苗勇.圆坯结晶器电磁搅拌过程三维流场与温度场数值模拟[J].金属学报,2008,44(12):1465-1473.
[10]陈伟,王宝祥,冯永平,等.φ210 mm圆坯结晶器电磁场-流场-温度场耦合数值模拟研究[J].铸造技术,2013(4):458-461.
[11]翟启杰,龚永勇,李仁兴.脉冲磁致振荡凝固细晶技术及其在连铸中的应用[C]//炼钢品种、质量提升研讨会.2015:12-16.
[12]Nozaki T,Matsuno J I,Murata K,et al.A secondary cooling pattern for preventing surface cracks of continuous casting slab[J].Trans Iron Steel Inst Jpn,1978,18(6):330-338.
[2]Langenberg F C,Pestel G,Honeycutt C R.Grain refinement of steel ingots by solidification in a moving electromagnetic field[J].Trans Metall Soc AIME,1961,221:993-1000.
[3]Vive S C.Effects of electromagnetic vibrations on the microstructure of continuously cast aluminium alloys[J].Materials Science and Engineering A,1993,173(1/2):169-172.
[4]葛丰德.电磁场对铝合金凝固过程的影响[J].哈尔滨理工大学学报,1983(1):70-78.
[5]Zhai Q J,Li Q S,Li H B.Structure evolution and solidification behavior of austenitic stainless steel in pulsed magnetic field[J].Journal of Iron and Steel Research International,2006,13(5):69-72.
[6]Gong Y Y,Luo J,Jing J X,et al.Structure refinement of pure aluminum by pulse magnetooscillation[J].Materials Science and Engineering A,2008,497(1):147-152.
[7]Liao X,Zhai Q,Luo J,et al.Refining mechanism of the electric current pulse on the solidification structure of pure aluminum[J].Acta Materialia,2007,55(9):3103-3109.
[8]黄军涛,赫冀成.方坯连铸二冷区电磁旋转搅拌数值模拟[J].钢铁研究学报,2001,13(5):19-23.
[9]于海岐,朱苗勇.圆坯结晶器电磁搅拌过程三维流场与温度场数值模拟[J].金属学报,2008,44(12):1465-1473.
[10]陈伟,王宝祥,冯永平,等.φ210 mm圆坯结晶器电磁场-流场-温度场耦合数值模拟研究[J].铸造技术,2013(4):458-461.
[11]翟启杰,龚永勇,李仁兴.脉冲磁致振荡凝固细晶技术及其在连铸中的应用[C]//炼钢品种、质量提升研讨会.2015:12-16.
[12]Nozaki T,Matsuno J I,Murata K,et al.A secondary cooling pattern for preventing surface cracks of continuous casting slab[J].Trans Iron Steel Inst Jpn,1978,18(6):330-338.