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| Numerical simulation of macro--segregation with equiaxed grains movement |
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| 清华大学机械系焊接馆201 |
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Cite this article:
;. Numerical simulation of macro--segregation with equiaxed grains movement. Chin J Mater Res, 2004, 18(3): 232-238.
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Abstract A mathematical model of equiaxed grains movement and macro--segregation has been
built to analyze the fluid flow and species distribution during the metal
solidification. The mushy zone was divided into dendrites region and free
equiaxed grains region by the dendritic coherency point. Macro--segregation of a
steel ingot in a rectangular mold with a riser was simulated and the calculation
result was compared with that of an experiment. It shows that the species
distribution obtained by the grain movement model is more consistent with
experiment comparing to that by the solid skeleton model in mush. The equiaxed
grains move with the fluid and accumulate at the bottom center of the ingot
during solidification. The cone--shape negative segregation forms after solidification.
The positive segregation in the upper center and the negative segregation in the
exterior region of the ingot are found at the same time.
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Received: 19 July 2004
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