Fracture mechanisms of sensitized stainless steels in sulfur-containing environments

Conference · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6290537

Newman, R C; Sieradzki, K; Isaacs, H S

The stress-corrosion cracking of sensitized type 304 stainless steel has been studied in a 6 x 10/sup -4/M sodium thiosulfate solution at room temperature. Under constant extension rate conditions the crack initiation probability is a maximum at -100 mV (SCE) and approaches zero for a smooth surface at < -300 or > +300 mV. Initiated cracks propagate at high rates at potentials as high as +500 mV; a maximum crack velocity of approx. 8 ..mu..m s/sup -1/ has been measured in a precracked specimen under constant load. Crack initiation probability can be correlated with the repassivation behavior of simulated grain boundary material, but the high crack propagation rates probably require a large contribution from intermittent mechanical grain boundary failure.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6290537
• Report Number(s): BNL-29671; CONF-810913-5; ON: DE81026052
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals &amp; Alloys-- Corrosion &amp; Erosion
ALLOYS
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CRACK PROPAGATION
CRYSTAL STRUCTURE
GRAIN BOUNDARIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MICROSTRUCTURE
NICKEL ALLOYS
PROBABILITY
STAINLESS STEEL-304
STAINLESS STEELS
STEELS
STRESS CORROSION
THIOSULFATES