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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 5    October 2003

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Numerical solution to T-φS-CL coupling in binary dendrite solidification with any solid-back diffusion effects
XU Da-ming(徐达鸣), GUO Jing-jie(郭景杰), FU Heng-zhi(傅恒志),
SU Yan-qing(苏彦庆), LI Qing-chun(李庆春)

School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China

Abstract:A previous numerical solution method to the strong nonlinear T-φS-CL coupling for a Scheil-type binary solidification process was extended and modified for single-phase dendrite solidifications of any nominal alloy composition(in a composition range of single-phase or eutectic solidification) and with any solid-back diffusion extents. Numerical sample computations were performed on Al-Cu system with different nominal compositions from almost pure Al to nearly eutectic and with different solid diffusion coefficients, which are factitiously enlarged or decreased in eight orders of magnitude. The calculation results exhibit the feasibility, capability and efficiency of the proposed numerical scheme in modeling an arbitrary binary dendrite solidification problem.

 

Key words: alloy solidification; coupled transport phenomena; solid-back diffusion; numerical modeling

ISSN 1672-7029
CN 43-1423/U

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