Abstract
Low-cycle-fatigue (LCF) and fatigue-crack-growth (FCG) behaviors of a cobalt-based HAYNES 188 superalloy were studied at temperatures ranging from 816 to 982 °C in laboratory air. Various tensile-hold times were imposed at the maximum strain and load in the LCF and FCG tests, respectively, to examine the high-temperature fatigue and creep–fatigue interactions. In this article, the effects of hold time and temperature on the cyclic-stress response, fatigue life, fracture mode, and crack-growth rate are discussed. Parameters based on the tensile-hysteresis energy are applied to correlate the LCF lives with and without hold time.
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Acknowledgements
This work is supported by the Solar Turbines, Inc., Haynes International, Inc., the Center for Materials Processing (CMP) at the University of Tennessee (UT), the U. S. Department of Energy’s Advanced Turbine Systems Program, the National Science Foundation (NSF), under Grant No. DMI-9724476, the NSF Combined Research-Curriculum Development (CRCD) Programs, under EEC-9527527 and EEC-0203415, the Integrative Graduate Education and Research Training (IGERT) Program, under DGE-9987548, the International Materials Institutes (IMI) Program under DMR-0231320, and the Major Research Instrumentation (MRI) Program, under DMR-0421219, with Ms. M. Poats, and Drs. C.V. Hartesveldt, J. Giordan, D. Dutta, P.W. Jennings, L.S. Goldberg, L. Clesceri, C. Huber, and C.E. Bouldin as contract monitors.
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Lee, S.Y., Lu, Y.L., Liaw, P.K. et al. Hold-time effects on elevated-temperature low-cycle-fatigue and crack-propagation behaviors of HAYNES® 188 superalloy. J Mater Sci 44, 2945–2956 (2009). https://doi.org/10.1007/s10853-009-3391-1
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DOI: https://doi.org/10.1007/s10853-009-3391-1