Effects of Long Term Exposures on Fatigue of PM Disk Superalloys

    (Received 3 September 2013; accepted 13 December 2013)

    Published Online: 2014

    CODEN: MPCOAD

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    Abstract

    Turbine disks in some advanced engine applications may be exposed to temperatures above 700°C for extended periods of time, approaching 1000 h. These exposures could affect near-surface composition and microstructure through formation of damaged and often embrittled layers. The creation of such damaged layers could significantly affect local mechanical properties. Powder metal disk superalloys LSHR and ME3 were exposed at temperatures of 704, 760, and 815°C for times up to 2020 h, and the types and depths of environmental attacked were measured. Fatigue tests were performed for selected cases at 704 and 760°C, to determine the impacts of these exposures on properties. Fatigue resistance was reduced up to 98 % in both superalloys for some exposure conditions. The changes in surface composition and phases, depths of these changed layers, failure responses, and failure initiation modes were compared.


    Author Information:

    Gabb, T. P.
    NASA Glenn Research Center, Structures and Materials Divison, Cleveland, OH

    Sudbrack, C. K.
    NASA Glenn Research Center, Structures and Materials Divison, Cleveland, OH

    Draper, S. L.
    NASA Glenn Research Center, Structures and Materials Divison, Cleveland, OH

    MacKay, R. A.
    NASA Glenn Research Center, Structures and Materials Divison, Cleveland, OH

    Telesman, J.
    NASA Glenn Research Center, Structures and Materials Divison, Cleveland, OH


    Stock #: MPC20130037

    ISSN: 2165-3992

    DOI: 10.1520/MPC20130037

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    Author
    Title Effects of Long Term Exposures on Fatigue of PM Disk Superalloys
    Symposium , 0000-00-00
    Committee E08