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Determination of uniaxial mechanical properties of unirradiated and irradiated Hastelloy-N bar and biaxial stress-rupture properties of chromized and coated unirradiated Hastelloy-N

Technical Report ·
DOI:https://doi.org/10.2172/6055697· OSTI ID:6055697
Short-time tensile tests were conducted on irradiated (2 x 10/sup 20/ nvt) and unirradiated Hastelloy-N bar from heats 5911 and 6252. No significant difference in mechanical properties was noted between the two heats. The 1200/sup 0/F ultimate tensile strength was decreased by irradiation from 65 to 80 ksi and 48 to 52 ksi. The 1400/sup 0/F ultimate tensile strength was decreased from 45 to 51 ksi to 32 to 34 ksi. The yield strength was not greatly affected by irradiation at either 1200 or 1400/sup 0/F. The 1200/sup 0/F elongation at fracture was decreased from 15 to 45% to 5 to 11%. The 1400/sup 0/F ductility was decreased from 8 to 26% to 1 to 1-1/2%. Unirradiated uniaxial stress-rupture tests were conducted at both AI and ORNL. No definite difference in stress-rupture properties between heats was noted at either 1200 or 1400/sup 0/F in ORNL tests, although some of the 1400/sup 0/F stress-rupture tests indicated that heat 6252 exhibited greater ductility. The AI verification tests showed a definite ductility difference, with heat 6252 exhibiting greater ductility. This phenomenon was attributed to an inhibition in crack propagation due to microsegregation.
Research Organization:
Atomics International Div., Canoga Park, CA (USA)
OSTI ID:
6055697
Report Number(s):
NAA-SR-TDR-12556; ON: DE85004471
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
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