Estimation of metal temperature of MCrAlY coated IN738 components based on interdiffusion behaviour

    Research output: Contribution to journalJournal articleResearchpeer-review

    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 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. The width of the growing zone was estimated on the basis of average intensity profiles obtained from experimental x-ray maps measured using energy dispersive spectroscopy in a scanning electron microscope. A simple parabolic growth model was set up for estimating the metal temperature near the coating/ substrate interface based on the growth kinetics of the precipitate free zone. Parameters for the model were extracted from measurements of the width of the growing precipitate free zone with time. The developed model was used to estimate metal temperatures for a service exposed, first stage gas turbine blade.
    Original languageEnglish
    JournalEnergy Materials
    Volume1
    Issue number2
    Pages (from-to)106-115
    ISSN1748-9237
    Publication statusPublished - 2006

    Cite this

    @article{f386e59e4fcf413b952ea20e26367111,
    title = "Estimation of metal temperature of MCrAlY coated IN738 components based on interdiffusion behaviour",
    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 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. The width of the growing zone was estimated on the basis of average intensity profiles obtained from experimental x-ray maps measured using energy dispersive spectroscopy in a scanning electron microscope. A simple parabolic growth model was set up for estimating the metal temperature near the coating/ substrate interface based on the growth kinetics of the precipitate free zone. Parameters for the model were extracted from measurements of the width of the growing precipitate free zone with time. The developed model was used to estimate metal temperatures for a service exposed, first stage gas turbine blade.",
    author = "Dahl, {Kristian Vinter} and John Hald",
    year = "2006",
    language = "English",
    volume = "1",
    pages = "106--115",
    journal = "Energy Materials",
    issn = "1748-9237",
    publisher = "Maney Publishing",
    number = "2",

    }

    Estimation of metal temperature of MCrAlY coated IN738 components based on interdiffusion behaviour. / Dahl, Kristian Vinter; Hald, John.

    In: Energy Materials, Vol. 1, No. 2, 2006, p. 106-115.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Estimation of metal temperature of MCrAlY coated IN738 components based on interdiffusion behaviour

    AU - Dahl, Kristian Vinter

    AU - Hald, John

    PY - 2006

    Y1 - 2006

    N2 - 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 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. The width of the growing zone was estimated on the basis of average intensity profiles obtained from experimental x-ray maps measured using energy dispersive spectroscopy in a scanning electron microscope. A simple parabolic growth model was set up for estimating the metal temperature near the coating/ substrate interface based on the growth kinetics of the precipitate free zone. Parameters for the model were extracted from measurements of the width of the growing precipitate free zone with time. The developed model was used to estimate metal temperatures for a service exposed, first stage gas turbine blade.

    AB - 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 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. The width of the growing zone was estimated on the basis of average intensity profiles obtained from experimental x-ray maps measured using energy dispersive spectroscopy in a scanning electron microscope. A simple parabolic growth model was set up for estimating the metal temperature near the coating/ substrate interface based on the growth kinetics of the precipitate free zone. Parameters for the model were extracted from measurements of the width of the growing precipitate free zone with time. The developed model was used to estimate metal temperatures for a service exposed, first stage gas turbine blade.

    M3 - Journal article

    VL - 1

    SP - 106

    EP - 115

    JO - Energy Materials

    JF - Energy Materials

    SN - 1748-9237

    IS - 2

    ER -