Acta Metall Sin  2006, Vol. 42 Issue (6): 591-598     DOI:

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MODELLING THE THERMO-SOLUTAL CONVECTION, SHRINKAGE FLOW AND GRAIN MOVEMENT DURING GLOBULAR EQUIAXED SOLIDIFICATION IN A MULTI-PHASE SYSTEM II. MODEL APPLICATION

Tongmin Wang

大连理工大学

Tongmin Wang. MODELLING THE THERMO-SOLUTAL CONVECTION, SHRINKAGE FLOW AND GRAIN MOVEMENT DURING GLOBULAR EQUIAXED SOLIDIFICATION IN A MULTI-PHASE SYSTEM II. MODEL APPLICATION. Acta Metall Sin, 2006, 42(6): 591-598 .

Abstract References Related Articles Recommended Metrics Download:  PDF(425KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The developed three-phase model of equiaxed globular solidification has been applied for two examples: (1) cooling channel process of semi-solid slurry of A356 aluminum alloy; (2) equiaxed globular solidification process of Al-4%Cu. In the example (1), the effects of processing parameters on the grain density, size and solid fraction have been studied. The cooling channel semi-solid slurry preparation process has been reproduced. The results show that, the grain density has its maximum at the pouring position of the cooling channel, the grain size and solid fraction have their maximum at the end of the cooling channel. Their distributions are almost uniform in the mold after rheocasting process. Decreasing proper pouring temperature is helpful to increase the grain density and solid fraction, and to decrease the grain size. In the example (2), the roles that thermo-solutal convection and feeding flow acted in the solidification have been studied. Thermal convection and feeding flow dominate the flow pattern at the beginning of solidification, thermo-solutal convection plays the important role at the middle of solidification and the feeding flow controls the end of solidification. Additionally, the effects of grain movement and feeding flow on the formation of free surface and macrosegregation have been studied. The results show that, the obstacle of grain movement directly affects the shape of free surface, and completely different macrosegregation maps are obtained in case of considering feeding flow and without. The developed model has been validated by comparing the grain size between the measurement and simulation. Key words:  semi-solid      macrosegregation      free surface       Received:  29 September 2005      ZTFLH:  TG249， TG291   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors Tongmin Wang URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2006/V42/I6/591 [1] Ohno A. Solidification-The Separation Theory and Its Practical Applications. Berlin: Springer-Verlag, 1987: 15 [2] Aguilar J, Fehlbier M, Biihrig-Polaczek A. In: Kainer K U, ed., Proc 6th Int Conf Magnesium Alloys and Their Applications. Wolfsburg, 2004: 37 [3] Aguilar J, Grimmig T, Buhrig-Polaczek A. In: Kainer K U, ed., Proc 6th Int Conf Magnesium Alloys and Their Applications. Wolfsburg, 2004: 767 [4] Wu S, Wu X, Xiao Z. Acta Mater, 2004; 52: 3519 [5] Modigell M, Koke J. J Mater Process Technol, 2001: 111(1-3): 53 [6] Petera J, Kotynia M. Int J Heat Mass Transf, 2004; 47: 1483 [7] Wang T M, Yao S, Zhang X G, Jin J Z, Wu M. Lndwig A, Pustal B, Biihrig-Polaczek A. 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