Creep-Fatigue-Environment Crack Tip Kinetics of Ni-Base Superalloys

    (Received 28 June 2013; accepted 10 December 2013)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    Several time-dependent damage mechanisms can operate during creep-fatigue loading. In the crack tip region, creep deformation, stress relaxation, oxygen diffusion along grain boundaries, and grain boundary oxidation are all occurring during the hold period of a creep-fatigue cycle. These conditions can lead to grain boundary embrittlement; however, it depends on the rates of the different processes. A comparison of the kinetics can determine which mechanisms are operational and which mechanism is the rate limiting step in the time-dependent damage process during creep-fatigue crack growth. This paper presents results for intergranular embrittlement occurring within a 10 s hold period and compares the kinetics of the processes.


    Author Information:

    Evans, Jeffrey L.
    Univ. of Alabama in Huntsville, Department of Mechanical and Aerospace Engineering, Huntsville, AL


    Stock #: MPC20130026

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130026

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    Author
    Title Creep-Fatigue-Environment Crack Tip Kinetics of Ni-Base Superalloys
    Symposium , 0000-00-00
    Committee E08