Effects of HFIR irradiation at 55/sup 0/C on the microstructure and toughness of HT-9 and 9Cr-1Mo

Technical Report · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5361884

Gelles, D S; Hu, W L; Huang, F H; Johnson, G D

Results are reported for base metal and weld metal specimens of HT-9 and Modified 9Cr-1Mo following irradiation in HFIR at 55/sup 0/C to 5 dpa. The DBTT shifts in irradiated base metal specimens were 30/sup 0/C for HT-9 and 90/sup 0/C for 9Cr-1Mo with further shifts of 20/sup 0/C for weld metal. Concurrently, strength as measured by hardness increased 15 percent for HT-9 and 25 percent for 9Cr-1Mo. The hardness increases can be attributed in part to defect cluster 1.5 to 3.0 nm in diameter at densities approaching 10/sup 17/ cm/sup -3/ and also to lower rates of cavity nucleation ahead of the propagating crack.

• Research Organization: Hanford Engineering Development Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76FF02170
• OSTI ID: 5361884
• Report Number(s): HEDL-7424; ON: DE84005382
• Country of Publication: United States
• Language: English

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ALLOY-HT-9
ALLOYS
BARYON REACTIONS
CHARPY TEST
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-MOLYBDENUM STEELS
CRACK PROPAGATION
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
ENRICHED URANIUM REACTORS
HADRON REACTIONS
HARDNESS
HFIR REACTOR
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
IRRADIATION REACTORS
ISOTOPE PRODUCTION REACTORS
LOW TEMPERATURE
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
REACTORS
RESEARCH AND TEST REACTORS
RESEARCH REACTORS
STEELS
TANK TYPE REACTORS
TEST REACTORS
TESTING
THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS