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Simulation of freckles during vertical solidification of binary alloys

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Abstract

A mathematical model of solidification that simulates the formation of channel segregates or freckles is presented. The model simulates the entire solidification process starting with the initial melt to the solidified cast, and the resulting segregation is predicted. Emphasis is given to the initial transient, when the dendritic zone begins to develop and the conditions for the possible nucleation of channels are established. The mechanisms that lead to the creation and eventual growth or termination of channels are explained in detail and illustrated by several numerical examples. Predictions of the pattern and location of channels in different cooling situations are in good agreement with experimental observations.

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Authors and Affiliations

  1. Argentine Atomic Energy Commission, Centro Atomico Bariloche, 8400, San Carlos de Bariloche, Argentina

    S. D. Felicelli (Research Engineer)

  2. Department of Aerospace and Mechanical Engineering, University of Arizona, 85721, Tucson, AZ

    J. C. Heinrich (Professor)

  3. Department of Materials Science and Engineering, University of Arizona, 85721, Tucson, AZ

    D. R. Poirier (Professor)

Authors
  1. S. D. Felicelli
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  2. J. C. Heinrich
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  3. D. R. Poirier
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Formerly Graduate Student, University of Arizona

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Felicelli, S.D., Heinrich, J.C. & Poirier, D.R. Simulation of freckles during vertical solidification of binary alloys. Metall Trans B 22, 847–859 (1991). https://doi.org/10.1007/BF02651162

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