Fatigue Crack Growth Behavior of Alloy 800H at Elevated Temperature

[+] Author and Article Information
K. Y. Hour, J. F. Stubbins

Department of Nuclear Engineering, University of Illinois, Urbana, Ill. 61801-2984

J. Eng. Mater. Technol 113(3), 271-279 (Jul 01, 1991) (9 pages) doi:10.1115/1.2903405 History: Received December 08, 1989; Revised August 11, 1990; Online April 29, 2008


High temperature crack growth behavior is investigated over a wide range of R-ratios, frequencies, and temperatures in Alloy 800H. It is found that high R-ratio, low frequency, or high temperature can enhance creep damage and thus induce an intergranular crack growth mode. At low frequencies, the nonlinear fracture mechanics parameter, C*, is found to correlate time-dependent fatigue crack growth rate well if the applied mean stress is used in calculating C*. On the other hand, the Paris crack growth law using K eff is proven to be an adequate expression to use when fatigue (time-independent) damage dominates. These conclusions correlate well with damage mechanisms observed from sample fracture surfaces.

Copyright © 1991 by The American Society of Mechanical Engineers
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