Charpy impact toughness of martensitic steels irradiated in FFTF: Effect of heat treatment

Conference · Thu Dec 31 04:00:00 EST 1992

OSTI ID:10166634

Klueh, R L; Alexander, D J

Charpy tests were made on plates of 9Cr-1MoVNb and 12Cr-1MoVW steels given four different normalizing-and-tempering treatments. One-third-size Charpy specimens from each steel were irradiated to 7.4-8 {times} 10{sup 26} n/m{sup 2} (about 34--37 dpa) at 420C in the Materials Open Test Assembly of the Fast Flux Test Facility. Specimens were also thermally aged to 20000 h at 400C to determine the effect of aging during irradiation. Previous work on these steels irradiated to 4--5 dpa at 365C in MOTA were reexamined in light of the new results. The tests indicated that prior austenite grain size, which was varied by different normalizing treatments, had an effect on impact behavior of the 9Cr-1MoVNb but not on the 12Cr-1MoVW. Tempering treatment had relatively little effect on the shift in DBTT for both steels. conclusions are presented on how heat treatment can be used to optimize properties.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10166634
• Report Number(s): CONF-920673--22; ON: DE93015960
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103
360106
CHARPY TEST
CHROMIUM-MOLYBDENUM STEELS
DUCTILE-BRITTLE TRANSITIONS
FFTF REACTOR
MARTENSITIC STEELS
MECHANICAL PROPERTIES
MICROSTRUCTURE
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS