Temperature effects on fatigue thresholds and structure sensitive crack growth in a nickel-base superalloy

M.A. Hicks, J.E. King

    Research output: Contribution to journalArticle

    Abstract

    Fatigue thresholds and slow crack growth rates have been measured in a powder formed nickel-base superalloy from room temperature to 600°C. Two grain sizes were investigated: 5-12 μm and 50 μm. It is shown that the threshold increases with grain size, and the difference is most pronounced at room temperature. Although crack growth rates increase with temperature in both microstructures, the threshold is only temperature dependent in the material with the larger grain size. It is also only in the latter that the room temperature threshold falls when the load ratio is increased from 0.1 to 0.5. At 600°C the higher load ratio causes a 20% reduction in the threshold irrespective of grain size. The results are discussed in terms of surface roughness and oxide-induced crack closure, the former being critically related to the type of crystallographic crack growth, which is in turn shown to be both temperature and stress intensity dependent. © 1983.

    Original languageEnglish
    Pages (from-to)67-74
    Number of pages8
    JournalInternational Journal of Fatigue
    Volume5
    Issue number2
    DOIs
    Publication statusPublished - Apr 1983

    Fingerprint

    Superalloy
    Temperature Effect
    Crack Growth
    Nickel
    Superalloys
    Thermal effects
    Fatigue
    Crack propagation
    Grain Size
    Fatigue of materials
    Crack Growth Rate
    Temperature
    Crack Closure
    Crack closure
    Dependent
    Surface Roughness
    Powder
    Powders
    Oxides
    Microstructure

    Keywords

    • crack closure
    • fatigue
    • fatigue crack growth
    • fatigue thresholds
    • grain size
    • nickel-base superalloys
    • temperature effects

    Cite this

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    abstract = "Fatigue thresholds and slow crack growth rates have been measured in a powder formed nickel-base superalloy from room temperature to 600°C. Two grain sizes were investigated: 5-12 μm and 50 μm. It is shown that the threshold increases with grain size, and the difference is most pronounced at room temperature. Although crack growth rates increase with temperature in both microstructures, the threshold is only temperature dependent in the material with the larger grain size. It is also only in the latter that the room temperature threshold falls when the load ratio is increased from 0.1 to 0.5. At 600°C the higher load ratio causes a 20{\%} reduction in the threshold irrespective of grain size. The results are discussed in terms of surface roughness and oxide-induced crack closure, the former being critically related to the type of crystallographic crack growth, which is in turn shown to be both temperature and stress intensity dependent. {\circledC} 1983.",
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    Temperature effects on fatigue thresholds and structure sensitive crack growth in a nickel-base superalloy. / Hicks, M.A.; King, J.E.

    In: International Journal of Fatigue, Vol. 5, No. 2, 04.1983, p. 67-74.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Temperature effects on fatigue thresholds and structure sensitive crack growth in a nickel-base superalloy

    AU - Hicks, M.A.

    AU - King, J.E.

    PY - 1983/4

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    N2 - Fatigue thresholds and slow crack growth rates have been measured in a powder formed nickel-base superalloy from room temperature to 600°C. Two grain sizes were investigated: 5-12 μm and 50 μm. It is shown that the threshold increases with grain size, and the difference is most pronounced at room temperature. Although crack growth rates increase with temperature in both microstructures, the threshold is only temperature dependent in the material with the larger grain size. It is also only in the latter that the room temperature threshold falls when the load ratio is increased from 0.1 to 0.5. At 600°C the higher load ratio causes a 20% reduction in the threshold irrespective of grain size. The results are discussed in terms of surface roughness and oxide-induced crack closure, the former being critically related to the type of crystallographic crack growth, which is in turn shown to be both temperature and stress intensity dependent. © 1983.

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    KW - grain size

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    KW - temperature effects

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