CAFD model for solidification of multicomponent and multiphase alloys

Ludovic Thuinet, Peter D. Lee

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    A combined cellular automaton - finite difference (CAFD) model has been enhanced to predict the formation of secondary eutectic phases during solidification allowing more accurate simulation of the as-cast microstructure of Ni-base superalloys. A CAFD model developed previously allows the prediction of the columnar-equiaxed transition, and defect formation, such as stray grains, or melt-back during the casting of single-crystal turbine blades. However, it is based on binary alloys with constant thermodynamic data. This work proposes a general formalism to extend the model to multicomponent and multiphase systems. The characteristic lamellar spacing of the eutectic structure in the interdendritic regions is in the order of a few microns. Since the code is dedicated to the prediction of mesoscale solidification structures, it is not possible to treat the nucleation and growth of each separate phase within the eutectic. As a consequence, the eutectic phases are treated numerically as a single phase with its own specific nucleation law and a rule-of-mixtures approach is used to calculate the eutectic fraction. The extended model is applied to Ni-based superalloys and the resulting predictions of microsegregation and microstructural formation are presented and discussed.

    Original languageEnglish
    Title of host publicationModeling of Casting, Welding and Advanced Solidification Processes - XI
    Subtitle of host publicationproceedings from the eleventh international conference on modeling of casting, welding and advanced solidification processes
    EditorsCharles-André Gandin, Michel Bellet
    Place of PublicationWarrendale
    PublisherMinerals, Metals & Materials Society
    Pages457-464
    Number of pages8
    ISBN (Print)0873396294, 9780873396295
    Publication statusPublished - 2006
    EventModeling of Casting, Welding and Advanced Solidification Processes - XI - Opio, France
    Duration: 28 May 20062 Jun 2006

    Conference

    ConferenceModeling of Casting, Welding and Advanced Solidification Processes - XI
    Country/TerritoryFrance
    CityOpio
    Period28/05/062/06/06

    Keywords

    • Eutectic phases
    • Modeling
    • Multicomponent and multiphase alloys
    • Solidification

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