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    Volume 19, Issue 6 (November 1991)

    Creep-Fatigue Interaction in T11 Boiler Tube Steel

    (Received 7 January 1991; accepted 9 May 1991)

    CODEN: JTEOAD

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    Abstract

    This study was undertaken to assess the damage to the mechanical properties of T1l boiler tube steel resulting from about 200 000 h of service. Test results at 1000°F show that the service exposure degrades all strength properties. Tensile strength decreased from 60 to 37 ksi, 1000-h creep strength from 33 to 17 ksi, and fatigue strength (stress ratio = 0.1, life = 200 000 cycles) from 42 to 28 ksi. Also, there was a highly deleterious creep-fatigue interaction, with only 5% fatigue damage reducing creep rupture life by up to a factor of five. Property degradation was accompanied by the formation of voids and a change in the carbide morphology. These findings demonstrate the necessity for accounting for the creep-fatigue interaction in assessing the remaining life of utility components.


    Author Information:

    Miller, GA
    Lehigh University, Bethlehem, PA

    Marder, AR
    Lehigh University, Bethlehem, PA

    Holt, SD
    South Bay Technology, San Clemente, CA

    Voorhees, HR
    Materials Technology, Ann Arbor, MI


    Stock #: JTE12612J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12612J

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    Author
    Title Creep-Fatigue Interaction in T11 Boiler Tube Steel
    Symposium , 0000-00-00
    Committee A01