High-cycle fatigue behavior of Incoloy alloy 800H in a simulated HTGR helium environment containing high moisture levels
A study has been carried out to evaluate the highcycle fatigue strength of Incoloy alloy 800H in a high-temperature gas-cooled reactor helium environment containing significant quantities of moisture. As-heat-treated and thermally aged materials were tested to determine the effects of long-term oxidation in the helium test gas. Results from these tests were compared to those for a standard air environment. It was found that the mechanisms of fatigue failure were complex and involved recovery/recrystallization of the surface-ground layer on the specimens, sensitization, work hardening, oxide scale integrity, and oxidation at the tips of propagating cracks. For certain situations, a corrosion-fatigue process seems to be important. However, for the helium environment studied, the fatigue strength was nearly always higher than that for air.
- Research Organization:
- Brookhaven National Laboratory, Upton, New York 11973
- OSTI ID:
- 6478037
- Journal Information:
- Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 66:2; ISSN NUTYB
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
AIR
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CRACK PROPAGATION
ELEMENTS
FATIGUE
FLUIDS
FRACTURE MECHANICS
FRACTURE PROPERTIES
GAS COOLED REACTORS
GASES
GRAPHITE MODERATED REACTORS
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HELIUM
HTGR TYPE REACTORS
INCOLOY 800H
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE ADDITIONS
MANGANESE ALLOYS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
MOISTURE
NICKEL ALLOYS
NONMETALS
OXIDATION
RARE GASES
REACTOR MATERIALS
REACTORS
RECRYSTALLIZATION
SILICON ADDITIONS
SILICON ALLOYS
STRAIN HARDENING
TESTING
TITANIUM ADDITIONS
TITANIUM ALLOYS