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Modeling of ingot distortions during direct chill casting of aluminum alloys

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Abstract

A comprehensive three-dimensional (3-D) mathematical model based upon the ABAQUS software has been developed for the computation of the thermomechanical state of the solidifying strand during direct chill (DC) casting of rolling sheet ingots and during subsequent cooling. Based upon a finiteelement formulation, the model determines the temperature distribution, the stresses, and the associated deformations in the metal. For that purpose, the thermomechanical properties of the alloy have been measured up to the coherency temperature using creep and indentation tests. The thermophysical properties as well as the boundary conditions associated with the lateral water spray have been determined using inverse modeling. The predicted ingot distortions, mainly, “butt curl,” “butt swell,” and lateral faces pull-in, are compared with experimental measurements performed during solidification and after complete cooling of the ingot. Particular emphasis is placed on the nonuniform contraction of the lateral faces. The influence of the mold shape and the contributions to this contraction are assessed as a function of the casting conditions.

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Authors and Affiliations

  1. Laboratoire de Metallurgie Physique, Ecole Polytechnique Federale de Lausanne, CH-1015, Lausanne, Switzerland

    J. -M. Drezet (Graduate Student) & M. Rappaz (Professor)

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  1. J. -M. Drezet
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  2. M. Rappaz
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Drezet, J.M., Rappaz, M. Modeling of ingot distortions during direct chill casting of aluminum alloys. Metall Mater Trans A 27, 3214–3225 (1996). https://doi.org/10.1007/BF02663872

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