Solute distribution in columnar crystal zone and influences of correlative factors for continuous casting slabs
The expression of the solute distribution in columnar crystal zone was deduced when the solid-liquid interface bended periodically, and the quantitative calculations of macrosegregation were also made in the process of the continuous casting. The solute distribution along the thickness direction of the slabs was obtained, which verified the theoretical calculation. The effect of the bulge size, solidification speed, and solidification shrinkage speed on macrosegregation of the slabs was calculated. It can be concluded that normal segregation and negative segregation alternatively appear as a result of the bulge. The normal segregation exponentially depends on the bulge size, and the negative segregation linearly depends on the bulge size. The extent of the normal segregation is greater than that of the negative segregation when the bulge size is the same. The macrosegregation of the same position along the thickness direction of the slabs changes in a sine wave with increasing the solidification rate, and the amplitude is larger at the casting blank center. The normal segregation linearly decreases with increasing the solidification shrinkage speed, and when the solidification shrinkage speed exceeds a critical value, the segregation appears negatively and increases linearly.
Key wordscontinuous casting columnar crystal zone solute distribution macrosegregation
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- 4.Moore J J. Continuous Casting [J]. ISS-AJME, 1984, (2): 185.Google Scholar
- 5.DU Qiang, LI Dian-zhong, LI Yi-yi. Quantitative Prediction of Macrosegregation Formation Caused by Natural Convection During Solidification of Steel Casting [J]. Acta Metallurgica Sinica, 2000, 36(11): 1197.Google Scholar
- 6.CHANG Guo-wei, ZHAO Zeng-wu, WANG Jing-song. Solute Distribution in Columnar Crystal Zone of Continuous Casting Billets [J]. Trans Nonferrous Met Soc China, 2001, 11(10): 708.Google Scholar
- 7.ZHAO Mei. Changes in Columnar Crystals’ Spacing Interval and Its Effect on Continuously Casting Solute Distribution [J]. Journal of Liaoning Institute of Technology, 2004, 24(6): 56 (in Chinese).Google Scholar
- 8.GAN Yong, QIU Sheng-tao, XIAO Ze-qiang. Simulation of Mathematics and Physics in the Continuous Cast Steel [M]. Beijing: Metallurgical Industry Press, 2001 (in Chinese).Google Scholar
- 9.HU Han-qi. Solidifiation Principle of Metals [M]. 2nd ed. Beijing: Metallurgical Industry Press, 2000 (in Chinese).Google Scholar
- 10.WANG Yan, ZHAO Mei, CHANG Guo-wei. Calculation of Slab s Bulge Size in Continuous Casting [J]. Journal of Liaoning Institute of Technology, 2005, 25(1): 23 (in Chinese).Google Scholar
- 11.CONG Mian. Casting Handbook (Cast Steel) [M]. 2nd ed. Beijing: Metallurgical Industry Press, 2002 (in Chinese).Google Scholar
- 12.HAN Zhi-qiang. Study on the Formation of Internal Crack in Continuously Cast Slab by Mathematical Models [M]. Beijing: University of Science and Technology Beijing, 2000 (in Chinese).Google Scholar