STP1367

    High Temperature Fretting Fatigue Behavior in an XD™ γ-base TiAl

    Published: Jan 2000


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    Abstract

    The plain and fretting fatigue behavior was studied of a γ-base TiAl intermetallics at 675°C in air. he TiAl material was produced by the XD™ process and had a nominal composition of Ti-47Al-2Nb-2Mn+0.8vol%TiB2. The contact material was Inconel 718. The reduction of fatigue strength by fretting was very small (around 20%) compared to metallic materials (30̃60%). The plain and fretting fatigue S-N curves were flat, which resembled the behavior of ceramic materials. The flat S-N curves are corresponding to the very steep crack growth curve reported for TiAl-based materials containing TiB2. A fretting fatigue crack nucleated in the very late stage of fatigue life (later than 0.75Nf), while it is known to nucleate in the very early stage of fatigue life (less than few percent of Nf) for steels. The fatigue lifetimes of this material were suggested to be determined by the cycles needed for nucleation of a crack rather than by crack propagation.

    Keywords:

    fretting fatigue, high temperature, contact pressure, intermetallics, mechanism


    Author Information:

    Hansson, T
    Nagaoka University of Technology, Nagaokashi,

    Kamaraj, M
    Nagaoka University of Technology, Nagaokashi,

    Mutoh, Y
    Nagaoka University of Technology, Nagaokashi,

    Pettersson, B
    Materials Technology, Volvo Aero Corporation,


    Paper ID: STP14722S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP14722S


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