Effect of 730 °C Supercritical Fluid Exposure on the Fatigue Threshold of Ni-Based Superalloy Haynes 282

Journal Article · Mon Jul 15 00:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04164-2· OSTI ID:22970663

Rozman, K. A., E-mail: [e-mail]; Holcomb, G. R., E-mail: [e-mail]; Carney, C. S., E-mail: [e-mail]; Doğan, Ö. N., E-mail: [e-mail] ^[1]; Kruzic, J. J., E-mail: [e-mail] ^[2]; Hawk, J. A., E-mail: [e-mail] ^[1]

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1. National Energy Technology Laboratory (United States)
2. University of New South Wales (Australia)

Driven by the need to reduce CO{sub 2} emissions from fossil power generation, new turbine working fluids are being investigated. One such fluid, supercritical carbon dioxide (sCO{sub 2}), offers potential for improved energy conversion efficiency. In situ corrosion studies on precipitate-hardened nickel superalloys in sCO{sub 2} have shown potentially dangerous subsurface depletion of gamma prime phase. In the present work, the ex situ effect of supercritical fluid exposure on fatigue crack growth thresholds was measured for the Ni-based superalloy Haynes 282. After exposure of 500 h at 730 °C, there was a small measurable and repeatable reduction in fatigue thresholds at room temperature from 13 to 11 MPa√m after exposure. This reduction in fatigue crack growth threshold occurred irrespective of the exposure environment and was attributed to a decrease in roughness-induced crack closure.

• OSTI ID: 22970663
• Journal Information: Journal of Materials Engineering and Performance, Vol. 28, Issue 7; Conference: 73. World Foundry Congress, Krakow (Poland), 23-27 Sep 2018; Other Information: Copyright (c) 2019 ASM International; Country of input: International Atomic Energy Agency (IAEA); ISSN 1059-9495
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CARBON DIOXIDE
CRACK PROPAGATION
ENERGY CONVERSION
ENERGY EFFICIENCY
HEAT RESISTING ALLOYS
SUPERCRITICAL STATE
WORKING FLUIDS