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    STP520

    Mechanisms of High-Temperature Fatigue

    Published: 01 January 1973


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    Abstract

    A review is presented of high-temperature fatigue mechanisms, with emphasis on nickel-base superalloys. It is shown that the slip character of a material (wavy versus planar), the extent of creep in the fatigue cycle, and the degree of oxidation all influence the mode and rate of fatigue crack initiation and propagation. These concepts are then used to explain the generally observed effects of temperature, mean stress, holdtime, and frequency on high-temperature fatigue life.

    Keywords:

    fatigue (materials), high temperature fatigue, crack initiation, crack propagation, intergranular fracture, transgranular fracture, fatigue fracture, environmental effects, coatings, nickel-base superalloys, stainless steels


    Author Information:

    Gell, M
    Group leader and senior research associate, Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, East Hartford, Conn.

    Leverant, GR
    Group leader and senior research associate, Materials Engineering and Research Laboratory, Pratt & Whitney Aircraft, East Hartford, Conn.


    Committee/Subcommittee: E08.05

    DOI: 10.1520/STP38829S