Acta Metall Sin  1998, Vol. 34 Issue (7): 678-688    DOI:

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MICRO-/MACRO-SCOPIC MODELING OF SOLUTAL MASS TRANSPORT IN DENDRITE SOLIDIFICAfION WITH PARTIAL SOLID BACK DIFFUSION

XU Daming ; ZHANG Chengjun ; SI Guangju (School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001)(Engineering College; Jiamusi University; Jiamusi 154007)

XU Daming ; ZHANG Chengjun ; SI Guangju (School of Materials Science and Engineering; Harbin Institute of Technology; Harbin 150001)(Engineering College; Jiamusi University; Jiamusi 154007). MICRO-/MACRO-SCOPIC MODELING OF SOLUTAL MASS TRANSPORT IN DENDRITE SOLIDIFICAfION WITH PARTIAL SOLID BACK DIFFUSION. Acta Metall Sin, 1998, 34(7): 678-688.

Abstract References Related Articles Recommended Metrics Download:  PDF(1019KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The continuum model proposed by the present authors for macroscopic solidification transport phenomena and macrosegregation formation was extended to account for the effect of any incomplete solid back diffusion through a microscopic dendrite solidification model. A generalized coefficient for the solid back diffusion was proposed by the present microscopic/macroscopic model, which includes the growing dendrite dimension, the parameters for the dendrite geometry, the solidification rate and partition coefficient etc besides the solid diffusivity.Numerical simulation of macrosegregations in a horizontal directionally soliditied A1-4.4Cu ingot with assumed different solid diffusivities of the copper solute was performed using the extended continuum model. The computation results show that the variation of the solid back diffusion can evidently influence the macrocomposition distribution in the soliditied ingot, and the greater the solid solute diffusivity, the lighter the macrosegregation seventy. Key words:  dendrite solidification      solid back diffusion      macrosegregation      mathematical model      A1-Cu alloy      Received:  18 July 1998      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1998/V34/I7/678 1 Bennon W D, Incropera F P. Int J Heat Mass Transfer 1987; 30: 2161, 2171 2 Prescott P J, Incropera F P, Bennon W D. Int J Heat Maas Transfer, 1991; 34: 2351 3 Voller V R, Prakash C. Int J Heat Mass Transfer 1987; 30: 1709 4 Beckermann C. Viskanta R. Phys Chem Hydrodyn. 1988: 10: 195 5徐达鸣,李庆春,安阁英铸造,1997;(4):44 (Xu Damin., Li Qingchun, An Geying Foundry, 1997(4): 44) 6 Diao Q Z, Tsai H L. 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