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http://dx.doi.org/10.3740/MRSK.2003.13.3.137

Thermal Expansion and Contraction Characteristics of Continuous Casting Carbon Steels  

Kim, H.C. (Department of Metallurgy and Materials Science, Changwon National University)
Lee, J.H. (Department of Metallurgy and Materials Science, Changwon National University)
Kwon, O.D. (Iron and Steel Making Research Group, Technical Research Laboratories, POSCO)
Yim, C.H. (Iron and Steel Making Research Group, Technical Research Laboratories, POSCO)
Publication Information
Korean Journal of Materials Research / v.13, no.3, 2003 , pp. 137-143 More about this Journal
Abstract
The air gap between the metal and mold, formed by shrinkage during solidification, causes surface and subsurface cracks in the continuous casting process. Molten crack on the surface might also occur due to improper heat transfer between them. In order to compensate the air gap in mold design, the thermal contraction is an essential factor. In this study, the thermal contraction and expansion behaviors were examined from the ($\alpha$ and pearlite)/${\gamma}$ to ${\gamma}$/$\delta$ transformations in continuous casting steels by the commercial dilatometer and the self- assembled dilatometer with laser distance measurement. It was found that the thermal contraction and expansion behaviors were very dependant on the phase transformation of the ${\gamma}$/$\delta$ as well as ($\alpha$ and pearlite)/${\gamma}$. The sudden volume change from $\delta$ to ${\gamma}$ which might cause cracks in the continuous casting process, was observed on cooling just below the melting temperature by the self-assembled dilatometer.
Keywords
thermal expansion/contraction coefficient; ferrite; austenite; continuous casting; phase transformation; low carbon steel;
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  • Reference
1 J. K. Brimacombe, Metal. Trans. B, 24B, 917 (1993)   DOI
2 W. R. Irving, Continuous Casting of Steel, the Institute of Materials, UK (1993)
3 B.G. Thomas, G. Li, a. Moita and D. Habing, Transactions Iron and Stell Mater, Oct., 125 (1998)
4 F. Richer, Arch. Eisenh., 41, 709 (1970)   DOI
5 M. R. Ridolf, Finite Element Modeling Applied to Shell Solidification in Continous Casting, 3rd European Conference Continuous Casting, 167 (1998)
6 Y. M. Won, K. H. Oh, Thermal Stress Analysis of Metal and Mold in Continuous Casting Process, Posco Technical Report (1997)
7 J. E. Kelly, K. P. Michalek, T. G. O. Connor, B. G. Thomas and J. A. Dantzing, Metal. Trans. A, 19A, 2589 (1988)   DOI
8 C. H. Yim, J. D. Lee, Y. C. Shin, Proceedings of the symposium on Solidification Process of Metals, Kor. Inst. Met. & mater., 147 (2001)
9 B. G. Thomas, Transactions Iron and Steel Mater, Dec. 53 (1998)
10 L. D. Lucas, Mem. Sci. Rev. Met., 69, 479 (1972)
11 L. D. Lucas, Mem. Sci. Rev. Met., 61, 97 (1964)
12 P. J. Wary, Metal. Trans. B, 7B, 639 (1976)
13 Hideo Miaukami, Akihiro Yamanaka, Tadao Watanabe, ISIJ International, 42(4), 374 (2002)
14 M. Hansen, Constitution of Binary alloys, 2nd edition, McGraw-Hill, New York (1958)
15 N. Ridley and H. Stuart, J. Met. Sci, 4, 218 (1970)