Simulation of the influence of carbides on the permeability of NI-base superalloys

D. Ness, L. Thuinet, D. Bernard, P. D. Lee

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

    Abstract

    The formation of freckle chains during the directional solidification of Ni-base superalloys results from convective flow of the liquid in the mushy zone. This flow depends on the permeability and the density inversion in the interdendritic liquid. It has been hypothesized that carbide particles within the mushy zone may affect the permeability and reduce the propensity for defect formation. However, this effect has never been quantified. Experimental permeability measurements are very difficult to perform, especially at low volume fraction solid levels, due to the changing morphology of the dendritic microstructure over time and high temperatures. Therefore, a numerically determined value for the permeability of directionally solidified alloys is proposed. This was achieved by first simulating solidification microstructures by means of an in-house microstructural model. The permeability was then numerically calculated using the predicted microstructures. The impact of carbides on permeability and freckle formation is discussed.

    Original languageEnglish
    Title of host publicationProperties and Performance of High Temperature Alloys and Coatings 2007 - Proceedings of Symposium held during the 2007 TMS Annual Meeting
    Pages1-10
    Number of pages10
    Publication statusPublished - 2007
    Event136th TMS Annual Meeting, 2007 - Orlando, FL, United States
    Duration: 25 Feb 20071 Mar 2007
    http://www.scopus.com/inward/record.url?eid=2-s2.0-40549103475&partnerID=40&md5=bfb0a624f21e64694aa3ad75eac1b0ae

    Conference

    Conference136th TMS Annual Meeting, 2007
    Country/TerritoryUnited States
    CityOrlando, FL
    Period25/02/071/03/07
    Internet address

    Keywords

    • Carbides
    • Casting simulation
    • Ni-base superalloys
    • Permeability

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