Effect of a helium environment on the mechanical properties of HTGR primary system metals
Creep and high cycle fatigue tests have been carried out on Incoloy 800H and Hastelloy X in a helium environment containing 40 ..mu.. atm of H/sub 2/O, 200 ..mu.. atm H/sub 2/, 40 ..mu.. atm CO, 20 ..mu.. atm CH/sub 4/ and 10 ..mu.. atm CO/sub 2/. The creep behavior of Incoloy 800H does not appear to show significant differences from that measured in air. However, the Hastelloy X at the maximum test temperature studied (871/sup 0/C, 1600/sup 0/F) shows behavior which is inferior. With respect to high cycle fatigue, the Incoloy 800H is weaker in the helium environment at a test temperature of 649/sup 0/C (1200/sup 0/F). At 760/sup 0/C (1400/sup 0/F) the strength in helium is higher but there is a tendency to lose strength more rapidly than for the air tests as the test time increases. Hastelloy X tested at 871/sup 0/C (1600/sup 0/F) also shows higher strength in helium for short test times but for extended tests the strengths in air and helium become similar. Scanning electron microprobe analyses have been carried out to correlate the strength measurements with surface oxidation characteristics and internal structural changes.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- EY-76-C-02-0016
- OSTI ID:
- 6349347
- Report Number(s):
- BNL-NUREG-25326; CONF-781144-15
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
COBALT ALLOYS
COOLING SYSTEMS
CREEP
CRYOGENIC FLUIDS
ELEMENTS
FATIGUE
FLUIDS
GAS COOLED REACTORS
GRAPHITE MODERATED REACTORS
HASTELLOY X
HASTELLOYS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HELIUM
HTGR TYPE REACTORS
IMPURITIES
INCOLOY 800
INCOLOY ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
PERFORMANCE TESTING
PRIMARY COOLANT CIRCUITS
RARE GASES
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR MATERIALS
REACTORS
TESTING
TUNGSTEN ALLOYS