Heat treatment effects on toughness of 9Cr-1MoVNb and 12Cr-1MoVW steels irradiated at 365 degrees C
The 9Cr-1MoVNb and 12Cr-1MoVW steels were austenitized at 1040 and 1100{degrees}C to produce different prior austenite grain sizes, after which they were given different tempering treatments (1 h at 760 or 2.5 h at 780{degrees}C). Subsize Charpy impact specimens from these materials were irradiated at 365{degrees}C up to 5 dpa. For 9Cr-1MoVNb steel in the unirradiated condition, the smaller the prior austenite grain size and the higher the tempering temperature, the lower the ductile-brittle transition temperature (DBTT). Regardless of the DBTT in the unirradiated condition, however, the DBTT shift for 9Cr-1MoVNb steel due to irradiation was the same for all heat treatments. This means heat treatment can be used to ensure a lower DBTT before and after irradiation. The 12Cr-1MoVW steel showed little effect of heat treatment on DBTT in the unirradiated condition, and the shift in DBTT was relatively constant. Thus, it appears that heat treatment cannot be used to reduce the effect of irradiation on DBTT for this steel.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 5969642
- Report Number(s):
- CONF-911111-32; ON: DE92006592
- Country of Publication:
- United States
- Language:
- English
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360103 -- Metals & Alloys-- Mechanical Properties
360106 -- Metals & Alloys-- Radiation Effects
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ALLOYS
CHARPY TEST
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
DESTRUCTIVE TESTING
DUCTILE-BRITTLE TRANSITIONS
FERRITIC STEELS
GRAIN SIZE
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
HIGH ALLOY STEELS
IMPACT TESTS
IRON ALLOYS
IRON BASE ALLOYS
MARTENSITIC STEELS
MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICAL TESTS
MICROSTRUCTURE
MOLYBDENUM ADDITIONS
MOLYBDENUM ALLOYS
Ma
Materials Studies-- (1992-)
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PHYSICAL RADIATION EFFECTS
RADIATION EFFECTS
SIZE
STAINLESS STEELS
STEEL-CR12MOV
STEEL-CR9MONBV
STEELS
TESTING
THERMONUCLEAR REACTOR MATERIALS
VANA
VANADIUM ADDITIONS
VANADIUM ALLOYS