Cyclic Behavior of Turbine Disk Alloys at 650°C

[+] Author and Article Information
B. A. Cowles, D. L. Sims, J. R. Warren

Pratt & Whitney Aircraft Group, Government Products Division, West Palm Beach, Fla. 33402

R. V. Miner

NASA/Lewis Research Center, Cleveland, Ohio

J. Eng. Mater. Technol 102(4), 356-363 (Oct 01, 1980) (8 pages) doi:10.1115/1.3224824 History: Received September 28, 1979; Online September 15, 2009


Five gas turbine disk alloys representing a range of strengths and processing methods were tested for resistance to both cyclic crack initiation and propagation at 650° C using a 0.33 Hz fatigue cycle and a cycle incorporating a 900 s tensile dwell. At the low strain ranges pertinent to disks, resistance to crack initiation increased with increasing tensile yield strength among the alloys, though the advantage was somewhat smaller for the creep fatigue cycle. Cyclic crack growth resistance, however, decreased with increasing strength and very markedly so for the dwell cycle.

Copyright © 1980 by ASME
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