Fracture toughness of irradiated stainless steel alloys
The postirradiation fracture toughness responses of Types 316 and 304 stainless steel (SS) wrought products, cast CF8 SS and Type 308 SS weld deposit were characterized at 427C using J/sub R/-curve techniques. Fast-neutron irradiation of these alloys caused an order of magnitude reduction in J/sub c/ and two orders of magnitude reduction in tearing modulus at neutron exposures above 10 dpa, where radiation-induced losses in toughness appeared to saturate. Saturation J/sub c/ values for the wrought materials ranged from 28 to 31 kJ/mS; the weld exhibited a saturation level of 11 kJ/mS. Maximum allowable flaw sizes for highly irradiated stainless steel components stressed to 90% of the unirradiated yield strength are on the order of 3 cm for the wrought material and 1 cm for the weld. Electron fractographic examination revealed that irradiation displacement damage brought about a transition from ductile microvoid coalescence to channel fracture, associated with local separation along planar deformation bands. The lower saturation toughness value for the weld relative to that for the wrought products was attributed to local failure of ferrite particles ahead of the advancing crack which prematurely initiated channel fracture.
- Research Organization:
- Hanford Engineering Development Lab., Richland, WA (USA)
- DOE Contract Number:
- AC06-76FF02170
- OSTI ID:
- 6434984
- Report Number(s):
- HEDL-SA-3471; ON: DE87009974
- Country of Publication:
- United States
- Language:
- English
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360103 -- Metals & Alloys-- Mechanical Properties
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ALLOYS
BREEDER REACTORS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
EPITHERMAL REACTORS
FAST REACTORS
FBR TYPE REACTORS
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
JOINTS
LIQUID METAL COOLED REACTORS
LMFBR TYPE REACTORS
MATERIALS
MECHANICAL PROPERTIES
MOLYBDENUM ALLOYS
NEUTRON FLUX
NICKEL ALLOYS
PHYSICAL RADIATION EFFECTS
POST-IRRADIATION EXAMINATION
RADIATION EFFECTS
RADIATION FLUX
REACTOR COMPONENTS
REACTOR MATERIALS
REACTORS
STAINLESS STEEL-304
STAINLESS STEEL-308
STAINLESS STEEL-316
STAINLESS STEELS
STEELS
STRESSES
TESTING
WELDED JOINTS