High cycle fatigue behavior of Incoloy 800H in a simulated high-temperature gas-cooled reactor helium environment
The current study was an attempt to evaluate the high cycle fatigue strength of Incoloy 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 corrosion in the helium test gas. Results from in-helium tests were compared to those from a standard air environment. It was found that the mechanisms of fatigue failure were very complex and involved recovery/recrystallization of the surface ground layer on the specimens, sensitization, hardness changes, oxide scale integrity, and oxidation at the tips of propagation cracks. For certain situations a corrosion-fatigue process seems to be controlling. However, for the helium environment studied, there was usually no aging or test condition for which air gave a higher fatigue strength.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5043389
- Report Number(s):
- NUREG/CR-1356; BNL-NUREG-51156; ON: TI86002772
- 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
CORROSION
CRACK PROPAGATION
ELEMENTS
FAILURES
FATIGUE
FLUIDS
GAS COOLED REACTORS
GASES
GRAPHITE MODERATED REACTORS
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
NICKEL ALLOYS
NONMETALS
RARE GASES
REACTORS
SILICON ADDITIONS
SILICON ALLOYS
SIMULATION
TESTING
TITANIUM ADDITIONS
TITANIUM ALLOYS