STP833: Wide Range Creep Crack Growth Rate Behavior of A470 Class 8 (Cr-Mo-V) Steel

    Saxena, A
    Materials Engineering Department, Westinghouse R&D CenterSteam Turbine-Generator Division, PittsburghPittsburgh, Pa.Pa.

    Shih, TT
    Materials Engineering Department, Westinghouse R&D CenterSteam Turbine-Generator Division, PittsburghPittsburgh, Pa.Pa.

    Ernst, HA
    Materials Engineering Department, Westinghouse R&D CenterSteam Turbine-Generator Division, PittsburghPittsburgh, Pa.Pa.

    Pages: 16    Published: Jan 1984


    Abstract

    Wide range steady-state creep crack growth rate behavior of an A470 Class 8 steel was characterized at 538°C (1000°F) using constant load and constant deflection rate methods of testing. Both methods yielded mutually consistent results. Crack growth rates in the range of 10−4 to 10−1 mm/h were successfully correlated with the energy rate line integral, C*. Results are discussed in light of the recent analytical studies that have appeared in the literature for growing cracks in creeping materials. Various methods of determining C* for CT specimens are also discussed.

    Keywords:

    creep, fracture, Cr-Mo-V steel, C, *-integral


    Paper ID: STP32572S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP32572S


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