|
|
|
| STUDY ON THE BEHAVIOUR OF BUBBLES IN A CONTINUOUS CASTING MOLD WITH Ar INJECTION AND TRAVELING MAGNETIC FIELD |
| CHEN Zhihui, WANG Engang, ZHANG Xingwu,WANG Yuanhua, ZHU Mingwei, HE Jicheng |
| Key Laboratory National Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110819 |
|
Cite this article:
CHEN Zhihui WANG Engang ZHANG XingwuWANG Yuanhua ZHU Mingwei HE Jicheng. STUDY ON THE BEHAVIOUR OF BUBBLES IN A CONTINUOUS CASTING MOLD WITH Ar INJECTION AND TRAVELING MAGNETIC FIELD. Acta Metall Sin, 2012, 48(8): 951-956.
|
|
|
Abstract Steel flow control in a continuous slab caster mold is effective for preventing entrapments of both mold power and argon gas bubbles and maintaining high slab quality. The steel flow control technology that utilizes a traveling magnetic field to optimize the flow of steel in the mold has been developed and applied. The moving magnetic fields can induce accelerating flow (electromagnetic level accelerator, EMLA), decelerating flow (electromagnetic level stabilizer, EMLS) and rotating flow (electromagnetic rotary stirring, EMRS) according the travel direction of the fields. EMLS mode applies a low frequency alternating magnetic field that moves from the narrow face of the mold to the mold center below the nozzle exits. In this study, the model experiments were carried out using liquid alloy of Pb–Sn–Bi and argon gas to study the two–phase fluid flow in the mold with a low frequency traveling magnetic field. The resistance probe was applied to measure the distribution of gas bubbles below the liquid surface and in the deeper liquid phase in the mold. The effect of various parameters such as magnetic flux density, casting speed and argon gas flow rate on the movement and distribution of argon gas bubbles in the mold was studied. The results indicate that the quantity of gas bubbles near the narrow face increases with increasing argon gas flow rate and casting speed. With imposed traveling magnetic field, the quantity of gas bubbles near narrow face at deep position in the pool was decreased, so the possibility that gas bubbles were entrapped into the solidification shell of the steel can be decreased, and the asymmetrical floating of bubbles along the width of mold for a higher casting speed was depressed, so higher disturbances at the free surface in the mold caused by excessive floating of gas bubbles locally can be avoided. The investigations on the floating of big bubbles revealed that the coalescence and flotation of bubbles can be enhanced with imposed traveling magnetic field, and the floating of big bubbles along the width of mold get more uniformity at 0.12 T.
|
|
Received: 19 December 2011
|
| Fund: Supported by National Natural Science Foundation of China (No.50834009), Program for Innovative Research Team for Liaoning University (No.LT2010035) and the Fundamental Research Funds for the Central Universityies (No.N110609001) |
| [1] Thomas B G, Zhang L. ISIJ Int, 2001; 41: 1181[2] Zhang L F, Yang S B, Cai K K, Li J Y, Wan X G, Thomas B G. Metall Mater Trans, 2007; 38B: 63[3] Singh V, Dash S K, Sunitha J S, Ajmani S K, Das A K. ISIJ Int, 2006; 46: 210[4] Cukierski K, Thomas B G. Metall Mater Trans, 2008; 39B: 94[5] Garcia–Hernandez S, Morales R D, Torres–Alonso E. Ironmaking Steelmaking, 2010; 37: 360[6] Timmel K, Eckert S, Gerbeth G. Metall Mater Trans, 2011; 42B: 68[7] Yu H Q, Zu M Y. ISIJ Int, 2008; 48: 584[8] Kunstreich S, Dauby P H. Ironmaking Steelmaking, 2005; 32: 80[9] Kubo N, Kubota J, Suzuki M, Ishii T. ISIJ Int, 2007; 47: 988[10] Miki Y, Takeuchi S. ISIJ Int, 2003; 43: 1548[11] Kwon Y, Zhang J, Lee H G. ISIJ Int, 2006; 46: 257[12] Yamashita S, Iguchi M. ISIJ Int, 2001; 41: 1529[13] Takatani K, Tanizawa Y, Mizukami H, Nishimura K. ISIJ Int, 2001; 41: 1252[14] Zhang S J, Zhu M Y, Zhang Y L, Zheng S G, Cheng N L, Song J X. Acta Metall Sin, 2006; 42: 1087(张胜军, 朱苗勇, 张永亮, 郑书国, 程乃良, 宋景欣. 金属学报, 2006; 42: 1087)[15] Cao N, Zhu M Y. Acta Metall Sin, 2008; 44: 79(曹娜, 朱苗勇. 金属学报, 2008; 44: 79)[16] Wang Y F, Dong A P, Zhang L F. Steel Res Int, 2011; 82: 428[17] Lei Z S, Zhang H B, Ren Z M, Deng K, Zhong Y B. 6th Int Conf on Electromagnetic Processing of Materials, Dresden, Germany: Forschungszentrum Dresden–Rossendrof, 2009: 575[18] Yu H Q, Zhu M Y. Acta Metall Sin, 2008; 44: 619(于海岐, 朱苗勇. 金属学报, 2008; 44: 619)[19] Yavuz M M. Steel Res Int, 2011; 82: 809[20] Yu Z, Zhang Z Q, Ren Z M, Lei Z S, Deng K. Acta Metall Sin, 2010; 46: 1275(于湛, 张振强, 任忠鸣, 雷作胜, 邓康. 金属学报, 2010; 46: 1275)[21] Kubo N, Ishii T, Kubota J, Ikagawa T. ISIJ Int, 2004; 44: 556[22] Kubota J, Kubo N, Ishii T, Suzuki M, Aramaki N, Nishimachi R. NKK Technol Rev, 2001; 85: 1[23] Toh H, Hasegawa H, Harada H. ISIJ Int, 2001; 41: 1245[24] Wang X D, Fautrelle Y, Etay J, Moreau R. Metall Mater Trans, 2009; 40B: 82[25] Wang H D, Zhu M Y, Yu H Q. J Iron Steel Res Int, 2010; 17: 25[26] Wang T F, Wang J F, Yang W G, Jin Y. J Chem Eng, 2001; 52: 197(王铁峰, 王金福, 杨卫国, 金涌. 化工学报, 2001; 52: 197) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
