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Modeling of continuous strip production by rheocasting

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Abstract

A process was experimentally and mathematically modeled for continuous and direct production of metal strip from its molten state by the use of Rheocasting. The process comprises 1) continuous production of a Rheocast semisolid alloy, and 2) direct shaping of the semisolid into strip. Sn-15 pct Pb was used as the modeling alloy. Crack formation and surface quality of the strip produced depend on fraction solid and deformation force. Continuous, sound strip could be obtained with good surface quality when fraction solid was between 0.50 and 0.70 and deformation force did not exceed a given maximum. Sheet thickness depends on deformation force, fraction solid, rotor rate of Rheocaster and production line speed. At constant deformation force, sheet thickness increases as fraction solid increases, rotor rate decreases and line speed is reduced. Sheet thickness is larger in the center than in the edge, but the difference is reduced by applying edgers. Some segregation of lead toward the edges is observed, and the segregation increases as amount of deformation is increased. A mathematical model for heat flow, solidification and deformation was constructed. The model predicts the point of completion of solidification in the strip and sheet thickness as a function of deformation force and line speed. Calculations are in good agreement with experimental results.

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Authors and Affiliations

  1. Fundamental Research Laboratories, Nippon Steel Corporation, Kawasaki, Japan

    T. Matsumiya

  2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA

    M. C. Flemings (Ford Professor of Engineering)

Authors
  1. T. Matsumiya
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  2. M. C. Flemings
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T. MATSUMIYA, formerly with Massachusetts Institute of Technology, Cambridge, MA.

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Matsumiya, T., Flemings, M.C. Modeling of continuous strip production by rheocasting. Metall Trans B 12, 17–31 (1981). https://doi.org/10.1007/BF02674755

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  • DOI: https://doi.org/10.1007/BF02674755

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