STP1367

    Influence of Surface Treatments on Fretting Fatigue of Ti-6242 at Elevated Temperatures

    Published: Jan 2000


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    Abstract

    Where fretting fatigue of titanium alloy gas turbine engine component is concerned, the effect of temperature on fretting processes can be quite significant. Service exposed third stage compressor blades, operating at 454°C or 850°F, showed severe signs of fretting, wear, CuNiln coating delamination, oxidation and pitting on the dovetail pressure surfaces. Under cyclic loading conditions fretting fatigue cracks, initiated in these damaged areas, can cause dramatic reduction in fatigue life of these components leading to potential catastrophic failure. A study has been carried out to evaluate the influence of various surface treatments, such as ion treatments, coatings and shot peening, on the fretting fatigue life of titanium alloy gas turbine engine components at elevated temperature. Results from high temperature fretting fatigue and pin-on-disk wear tests are discussed in this paper. Significant contrast between the wear and fatigue test results illustrates the potential dangers of using sliding wear tests to rank surface treatments for fretting fatigue amelioration.

    Keywords:

    fretting fatigue, high temperature wear, gas turbine engines, titanium alloys, surface modification techniques, ion implantation, ion plating, oxidation


    Author Information:

    Chakravarty, S
    Project manager, Aerospace engineer and Senior manager, Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont.

    Dyer, JP
    Project manager, Aerospace engineer and Senior manager, Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont.

    Conway, JC
    Professor, Applied Research Laboratory, The Pennsylvania State University, PA

    Segall, AE
    Associate Professor of Mechanical Engineering, Washington State University-Vancouver, Vancouver, Washington

    Patnaik, PC
    Project manager, Aerospace engineer and Senior manager, Advanced Material and Energy Systems, Orenda Aerospace Corporation, Gloucester, Ont.


    Paper ID: STP14750S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP14750S


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