A multi-scale 3D model of the vacuum arc remelting process

Koulis Pericleous, Georgi Djambazov, Mark Ward, Lang Yuan, Peter D. Lee

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

    Abstract

    A multi-scale model of the VAR process was developed to simulate unsteady phenomena within the ingot melt pool due to arc motion and the resulting effects on dendritic microstructure. External magnetic field and surface current measurements were used as boundary conditions, to determine the trajectory of the arcs between electrode and ingot and between ingot and sidewalls. The interactions between magnetic field, turbulent metal flow and heat transfer were modeled using CFD techniques and this "macro" model was linked to a micro model, to resolve the evolving dendritic microstructure, and to establish a relationship between operational parameters and microstructure defects. Arc-driven solute convection in the mushy zone leading to local remelting and changes in local Rayleigh number provided an indicator of when fluid flow channels (freckles) will initiate within the mushy zone. Particle tracking was further used, to characterize the trajectory and dissolution of inclusions entering the melt, causing "white spot" defects.

    Original languageEnglish
    Title of host publicationTMS 2012 - 141st Annual Meeting and Exhibition, Supplemental Proceedings
    Pages291-298
    Number of pages8
    Volume2
    Publication statusPublished - 2012
    Event141st Annual Meeting and Exhibition, TMS 2012 - Orlando, FL, United States
    Duration: 11 Mar 201215 Mar 2012
    http://www.scopus.com/inward/record.url?eid=2-s2.0-84860865547&partnerID=40&md5=0bce687833020d9b73157a0c9ef5dfaa

    Conference

    Conference141st Annual Meeting and Exhibition, TMS 2012
    Country/TerritoryUnited States
    CityOrlando, FL
    Period11/03/1215/03/12
    Internet address

    Keywords

    • Arc behavior
    • Numerical simulation
    • Special alloys
    • VAR defects

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