Grain boundary chemistry in irradiated stainless steel and its influence on environmental degradation

Conference · Tue Aug 01 04:00:00 EDT 1989

OSTI ID:5890142

Bruemmer, S M; Simonen, E P; Charlot, L A

Radiation-induced segregation (RIS) of chromium, silicon and phosphorus and its influence on intergranular stress corrosion cracking (IGSCC) of stainless steel (SS) has been investigated. Material and irradiation effects on RIS to grain boundaries were studied using ion bombardment of fine-grained, sputter-deposited SS. Damage levels up to 10 dpa were produced in near-surface regions encompassing several grain diameters in depth. The resultant ''bulk'' damage promotes RIS of silicon and depletion of chromium at grain interfaces. Silicon enrichment and chromium depletion was highly localized to within 25 nm of the boundary in 316 SS heats as measured by analytical transmission electron microscopy. No significant grain boundary enrichment of phosphorus was observed in these heats even though heats contained very high levels of phosphorus in the bulk. Grain boundary chemistry effects on the IG corrosion and SCC of 316 SS have also been examined by varying phosphorus segregation and chromium depletion through controlled thermal treatments. 28 refs., 3 figs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5890142
• Report Number(s): PNL-SA-17213; CONF-890820-3; ON: DE89016827
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360105 -- Metals & Alloys-- Corrosion & Erosion
360106* -- Metals & Alloys-- Radiation Effects
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CHROMIUM-NICKEL-MOLYBDENUM STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CRACKS
CRYSTAL STRUCTURE
ELEMENTS
GRAIN BOUNDARIES
HEAT RESIS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
METALS
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
PHOSPHORUS
RADIATION EFFECTS
SEGREGATION
SEMIMETALS
SILICON
STAINLESS STEEL-316
STAINLESS STEELS
STEEL-CR17NI12MO3
STEELS
STRESS CORROSION
TRANSITION ELEMENTS