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Calculated solute segregation kinetics related to irradiation assisted stress corrosion cracking

Conference ·
OSTI ID:5681564
;
Solute segregation kinetics were calculated for neutron irradiation conditions relevant to irradiation assisted stress corrosion cracking (IASCC) and ion irradiation conditions relevant to irradiation-induced solute segregation experiments. Requirements for near-monolayer coverage of surfaces or grain boundaries were determined based on assumptions of the McLean isotherm, enhanced diffusion kinetics, and self-interstitial-solute binding. Predicted nonequilibrium segregation driven by irradiation was consistent with reported measurements of ion-induced segregation for reasonable assumed values of interstitial-solute binding energy. Near-monolayer boundary concentrations were predicted for LWR temperatures and at doses near the threshold for IASCC. The calculations indicate that undersized elements such as phosphorus, sulfur and silicon are expected to segregate and possibly influence IASCC. The nonequilibrium segregation mechanism does not require an enrichment ratio dictated by the McLean isotherm, therefore, undersized solutes that do not segregate thermally may segregate unexpectedly during irradiation. 20 refs., 8 figs., 2 tabs.
Research Organization:
Pacific Northwest Lab., Richland, WA (USA)
DOE Contract Number:
AC06-76RL01830
OSTI ID:
5681564
Report Number(s):
PNL-SA-14825; CONF-870839-9; ON: DE88003423
Country of Publication:
United States
Language:
English

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Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200 -- Nuclear Reactor Technology-- Components & Accessories
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
BARYONS
BINDING ENERGY
CHARGED PARTICLES
CHEMICAL REACTIONS
CORROSION
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTARY PARTICLES
ELEMENTS
ENERGY
FAST NEUTRONS
FERMIONS
GRAIN BOUNDARIES
HADRONS
INTERSTITIALS
IONS
KINETICS
MICROSTRUCTURE
NEUTRONS
NONMETALS
NUCLEONS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHYSICAL RADIATION EFFECTS
POINT DEFECTS
RADIATION EFFECTS
REACTORS
SEGREGATION
SEMIMETALS
SILICON
SOLUTES
STRESS CORROSION
SULFUR
TEMPERATURE DEPENDENCE
WATER COOLED REACTORS