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    STP1159

    Improving Fretting Fatigue Strength at Elevated Temperatures by Shot Peening in Steam Turbine Steel

    Published: 01 January 1992


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    Abstract

    Fretting fatigue tests at elevated temperature were carried out using shot-peened specimens to improve the high temperature fretting fatigue strength of 12Cr-Mo-W-V steam turbine steel. Shot peening improved fretting fatigue strengths by a factor of 1.8 at an elevated temperature (773 K) as well as at room temperature. Residual compressive stresses first drop rapidly by a factor of three and then level off. Residual compressive stresses of 200 MPa were measured after a 30 000 h exposure at 773 K. Shot peening is thus shown to be effective over long periods at 773 K.

    Keywords:

    fretting fatigue, fatigue at elevated temperature, shot peening, residual stress, steam turbine steel


    Author Information:

    Mutoh, Y
    Professor and research associate, Nagaoka University of Technology, Nagaoka-shi,

    Satoh, T
    Professor and research associate, Nagaoka University of Technology, Nagaoka-shi,

    Tsunoda, E
    Toshiba Corporation, Yokohama,


    Committee/Subcommittee: E08.03

    DOI: 10.1520/STP25835S