Charpy impact toughness of martensitic steels irradiated in FFTF: Effect of heat treatment
- Oak Ridge National Lab., TN (United States)
Plates of 9Cr-1MoVNb and 12Cr-1 MoVW steels were normalized and then tempered at two different tempering conditions. One-third-size Charpy specimens from each steel were irradiated to 7.4-8{times}10{sup 26} n/m{sup 2} (about {approximately}35 dpa) at 420{degrees}C in the Materials Open Test Assembly (MOTA) of the Fast Flux Test Facility. Specimens were also thermally aged to 20,000 h at 400{degrees}C to compare the effect of aging and irradiation. Previous work on the steels irradiated to 4-5 dpa at 365{degrees}C 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)
- OSTI ID:
- 139215
- Report Number(s):
- DOE/ER--0313/13; ORNL/M--2722; ON: DE93013462
- Country of Publication:
- United States
- Language:
- English
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Charpy impact toughness of martensitic steels irradiated in FFTF: Effect of heat treatment
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARPY TEST
CHROMIUM ALLOYS
DISPLACEMENT RATES
GRAIN SIZE
HEAT TREATMENTS
IMPACT STRENGTH
IRON BASE ALLOYS
IRRADIATION
MARTENSITIC STEELS
MOLYBDENUM ADDITIONS
NEUTRON FLUX
NIOBIUM ADDITIONS
PHYSICAL RADIATION EFFECTS
PROGRESS REPORT
TEMPERATURE RANGE 0400-1000 K
THERMONUCLEAR REACTOR MATERIALS
TUNGSTEN ADDITIONS
VANADIUM ADDITIONS