STP942

    A Model for Life Predictions of Nickel-Base Superalloys in High-Temperature Low Cycle Fatigue

    Published: Jan 1988


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    Abstract

    Extensive characterization of low-cycle fatigue damage mechanisms was performed on polycrystalline René 80 and IN100 tested in the temperature range from 871 to 1000°C. Low-cycle fatigue life was found to be dominated by propagation of microcracks to a critical size governed by the maximum tensile stress. A model was developed which incorporates a threshold stress for crack extension, a stress-based crack growth expression, and a failure criterion. The mathematical equivalence between this mechanistically based model and the strain-life low-cycle fatigue law was demonstrated using cyclic stress-strain relationships. The model was shown to correlate the high-temperature low-cycle fatigue data of the different nickel-base superalloys considered in this study.

    Keywords:

    nickel-base superalloys, high-temperature low-cycle fatigue, high-strain fatigue crack propagation, fatigue models, environmental effects


    Author Information:

    Romanoski, GR
    Research Assistant and Professor, Massachusetts Institute of Technology, Cambridge, MA

    Antolovich, SD
    Georgia Institute of Technology, Atlanta, GA

    Pelloux, RM
    Research Assistant and Professor, Massachusetts Institute of Technology, Cambridge, MA


    Paper ID: STP24497S

    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP24497S


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