Characterization of grain boundary fracture in neutron-irradiated stainless steel by micro tensile test
- 1. Inst. of Nuclear Safety System, Inc., Inst. of Nuclear Technology, Mihama, Fukui (Japan)
- 2. Nippon Nuclear Fuel Development Co., Ltd., Oarai, Ibaraki (Japan)
Description
Characteristics of grain boundary fracture in stainless steel highly irradiated in a light water reactor was investigated by the micro tensile testing method. Micro tensile specimens containing a grain boundary were machined by the focused ion beam (FIB) technique for SUS316 stainless steel irradiated to 74dpa and then tensioned at room temperature in the FIB system. Brittle-like fracture occurred in one of two irradiated specimens, whereas fully ductile fractures occurred with high elongation in unirradiated specimens. From fractography by scanning electron microscopy, flat fracture surfaces and steps were observed on the irradiated specimen that had brittle-like fracture. Cross-sectional microstructural observation by transmission electron microscopy revealed that the grain boundary was fractured in this irradiated specimen. It was found that the grain boundary in highly irradiated stainless steel was fractured by stress concentration at the grain boundary due to accumulation of strain originating from twin deformation in the matrix. (author)
Additional details
Publishing Information
- Journal Title
- INSS Journal
- Journal Volume
- 19
- Journal Page Range
- p. 155-165
- ISSN
- 1340-4482
INIS
- Country of Publication
- Japan
- Country of Input or Organization
- Japan
- INIS RN
- 44084598
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- CRACKS; FRACTURES; GRAIN BOUNDARIES; IRRADIATION; NEUTRONS; PWR TYPE REACTORS; SCANNING ELECTRON MICROSCOPY; STAINLESS STEEL-316; STRESS CORROSION; TENSILE PROPERTIES; TRANSMISSION ELECTRON MICROSCOPY
- Descriptors DEC
- ALLOYS; AUSTENITIC STEELS; BARYONS; CARBON ADDITIONS; CHEMICAL REACTIONS; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-MOLYBDENUM STEELS; CHROMIUM-NICKEL STEELS; CHROMIUM-NICKEL-MOLYBDENUM STEELS; CORROSION; CORROSION RESISTANT ALLOYS; ELECTRON MICROSCOPY; ELEMENTARY PARTICLES; ENRICHED URANIUM REACTORS; FAILURES; FERMIONS; HADRONS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; HIGH ALLOY STEELS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; MECHANICAL PROPERTIES; MICROSCOPY; MICROSTRUCTURE; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NUCLEONS; POWER REACTORS; REACTORS; STAINLESS STEELS; STEEL-CR17NI12MO3; STEELS; THERMAL REACTORS; TRANSITION ELEMENT ALLOYS; WATER COOLED REACTORS; WATER MODERATED REACTORS
Optional Information
- Notes
- 12 refs., 13 figs., 3 tabs.