Analysis on Initial Defects Based on Mechanical State of Meniscus Shell
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The meniscus shell plays an important role in slab quality and process operation for continuously cast steel. One decisive reason is initial solidifying shell and growing dendrite under the mechanical stress caused by mold oscillation and liquid steel flow to generate disturbance of casting. The mechanical state of meniscus shell was analyzed using mathematical models in combination with thermo-physical properties and flow rate of steel to shed light on the formation of initial defects. The results show that the mold oscillation is a critical factor on the initial crack formation because the periodic stress makes the shell bending. The formed crack may also expand and propagate due to the following secondary cooling and straightening behavior. The primary dendrite has high possibility to be broken by fluid flow in the solidification front to lead to the non-uniform thickness of solidifying shell. The inter-dendrite bridging is also likely to be formed to produce other internal defects, such as air hole and solute enrichment in the residual molten steel located in the bridging area.
Key wordscontinuous casting mold oscillation meniscus shell initial defect mathematical model
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- 7.S. D. Chen, Z. F. Hu, Y. Y. Yuan, Y. Z. Luo, J. Iron Steel Res. Int. 18 (2011) Suppl. 2, 383–388.Google Scholar
- 8.N. B. Ma, Z. S. Lei, X. L. Jin, G. H. Cao, Y. B. Zhong, Z. M. Ren, Acta Metall. Sin. 44 (2008) 1019–1024.Google Scholar
- 10.X. Z. Na, X. G. Wang, X. Z. Zhan, Y. Gan, J. Iron Steel Res. 17 (2005) No. 5, 31–34, 47.Google Scholar
- 13.X. N. Meng, M. Y. Zhu, N. L. Chen, Acta Metall. Sin. 43 (2007) 839–846.Google Scholar
- 15.M. Y. Zhu, Modern Metallurgical Technology, Metallurgical Industry Press, Beijing, 2011.Google Scholar
- 16.J. J. Bikerman, Physical Surface, Academic Press, London, 1970.Google Scholar
- 17.X. N. Meng, M. Y. Zhu, J. Iron Steel Res. Int. 15 (2008) Suppl. 1, 510–516.Google Scholar
- 19.G. J. Davies, Y. K. Shin, Solidification Technology in the Foundry and Cast House, The Metal Society, London, 1979.Google Scholar
- 22.E. D. Nijs, G. Coombes, T. Kuroda, in: InSteelCon 2011 Proceedings, Steel Institute VDEh Press, Düsseldorf, 2011, pp. 1–9.Google Scholar
- 23.F. J. Ma, G. H. Wen, G. Li, Res. Iron Steel 1 (2000) 10–14.Google Scholar
- 24.B. Mao, G. F. Zhang, A. W. Li, Theories and Techniques of Electromagnetic Stirring in Continuous Steel Casting, Metallurgical Industry Press, Beijing, 2012.Google Scholar