SEDL / STP / STP833-EB / STP32572S

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

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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.