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Using a Three-Phase Deterministic Model for the Columnar-to-Equiaxed Transition

  • SYMPOSIUM: Solidification Modeling and Microstructure Formation: In Honor of Prof. John Hunt
  • Published:
Metallurgical and Materials Transactions A Aims and scope Submit manuscript

In order to overcome the limitations of previous columnar-to-equiaxed (CET) models, which neglect melt convection and the movement of free equiaxed grains, this article presents a three-phase deterministic CET model. With appropriated multiphase volume-averaging approaches, it is possible to account for nucleation and growth of equiaxed grains ahead of a growing columnar front, the influence of melt convection, and grain sedimentation, and the occurrence of a CET in a casting of engineering scale. Special modeling assumptions ensure that both CET mechanisms, namely, “hard” and “soft” blocking, are tackled. It is highly recommended that both mechanisms should be considered, especially in the situation where grain sedimentation and melt convection are present. Although the current model incorporates almost all the physical variables relevant to a CET event, under special condition of a one-dimensional case, the model still reproduces the results of Hunt’s classical CET approach.

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Authors and Affiliations

  1. Christian-Doppler-Laboratory for Multiphase Modeling of Metallurgical Processes, Department of Metallurgy, University of Leoben, A-8700, Leoben, Austria

    M. Wu (Group Leader of Numerical Modeling and Simulation and Chair of Simulation and Modeling of Metallurgical Processes) & A. Ludwig (Professor and Director and Chair of Simulation and Modeling of Metallurgical Processes)

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  1. M. Wu
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  2. A. Ludwig
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Correspondence to M. Wu.

Additional information

This article is based on a presentation made in the symposium entitled “Solidification Modeling and Microstructure Formation: In Honor of Prof. John Hunt,” which occurred March 13–15, 2006, during the TMS Spring Meeting in San Antonio, Texas, under the auspices of the TMS Materials Processing and Manufacturing Division, Solidification Committee.

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Wu, M., Ludwig, A. Using a Three-Phase Deterministic Model for the Columnar-to-Equiaxed Transition. Metall Mater Trans A 38, 1465–1475 (2007). https://doi.org/10.1007/s11661-007-9175-9

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  • DOI: https://doi.org/10.1007/s11661-007-9175-9

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