Microstructural Investigations and Modelling of Interdiffusion between MCrAlY Coating and IN738 Superalloy

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    Abstract

    Interdiffusion at the interface between a Co-36.5Ni-17.5Cr-8Al-0.5Y, MCrAlY coating and the underlying IN738 superalloy was studied in a large matrix of specimens isothermally heat treated for up to 12,000 hours at temperatures 875°C, 925°C or 950°C. Microstructural investigations and calculated phase fraction diagrams show that a precipitate free zone forms between the coating and superalloy and grows with time. Measured composition profiles across the interface were compared with modelled results obtained using the finite difference software DICTRA. The simulated results were able to qualitatively predict the phase-transformations occurring at the interface. The microstructural studies showed that a layer of continuous γ´ was formed on the superalloy side of the interface. This was found in the simulated results as a very high fraction of γ´.
    Original languageEnglish
    Title of host publicationMaterials for Advanced Power Engineering 2006 : Procedings of the 8th Liège Conference
    EditorsJ. Lecomte-Beckers, M. Carton, F. Schubert, P. J. Ennis
    Volume2
    Place of PublicationJülich
    PublisherForschungszentrum Jülich
    Publication date2006
    Pages675-690
    ISBN (Print)3-89336-436-6
    Publication statusPublished - 2006
    EventThe Eighth Liège Conference : Materials for Advanced Power Engineering - Liège
    Duration: 1 Jan 2006 → …
    Conference number: 8

    Conference

    ConferenceThe Eighth Liège Conference : Materials for Advanced Power Engineering
    Number8
    CityLiège
    Period01/01/2006 → …

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