Influence of cyclic load and environmental effects on stress corrosion cracking of sensitized stainless steel. Final report
An experimental stress-corrosion cracking (SCC) study has been conducted in order to mitigate SCC in stainless steel piping in BWR's. Effect of the temperature, dissolved oxygen, and cyclic loading was studied on furnace sensitized Type 304 stainless steel. Slow strain rate tests at 4 x 10/sup -6/ s/sup -1/ strain rate produced intergranular stress-corrosion cracking (IGSCC) at temperatures above 204/sup 0/C, suggesting a threshold temperature for IGSCC of about 130/sup 0/C at the 0.2 ppM oxygen level. Saturated solutions of AgCl produced IGSCC in slow strain rate tests in both aerated (8 ppM O/sub 2/) and deaerated (< 0.06 ppM O/sub 2/) tests at temperatures as low as 85/sup 0/C. Results suggest a potential hazard in using Ag/AgCl reference electrodes. IGSCC also was produced by trapezoidal cyclic loading (5 min load/unload, 10 or 75 min at load). Tests in 8 ppM oxygen water with the 75 min hold cycle, minimum load of 0.1 yield strength (YS) and maximum load greater than YS, indicated a threshold temperature for IGSCC of 190/sup 0/C. Other cyclic load tests in 288/sup 0/C - 8 ppM oxygen water with minimum load of 0.1 YS and maximum load less than YS, produced IGSCC at maximum loads as low as 0.7 YS in the rather high yield strength material studied (YS = 36.3 ksi at 288/sup 0/C). Low increment load cyclic loading produced IGSCC with cyclic loads ranging between 0.5 and 0.6 YS and 0.8 to 0.9 YS, but not at 0.6 to 0.7 YS or 0.7 to 0.8 Ys. The short hold cycle (10 min at load) was much less aggressive in promoting IGSCC than the long hold cycle (75 min at load).
- Research Organization:
- Battelle Columbus Labs., OH (USA)
- OSTI ID:
- 6233653
- Report Number(s):
- EPRI-NP-1991; ON: DE81904216; TRN: 81-017295
- Country of Publication:
- United States
- Language:
- English
Similar Records
Stress Corrosion Cracking Response of 304 Stainless Steel in ASerated and Dearated Water
Effect of temperature and ionic impurities at very low concentrations on stress corrosion cracking of type 304 stainless steel
Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BWR TYPE REACTORS
PIPES
STRESS CORROSION
STAINLESS STEEL-304
AQUEOUS SOLUTIONS
CRACKS
INTERGRANULAR CORROSION
SILVER CHLORIDES
STRAIN RATE
ALLOYS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MIXTURES
NICKEL ALLOYS
REACTORS
SILVER COMPOUNDS
SOLUTIONS
STAINLESS STEELS
STEELS
TRANSITION ELEMENT COMPOUNDS
WATER COOLED REACTORS
WATER MODERATED REACTORS
360105* - Metals & Alloys- Corrosion & Erosion
210100 - Power Reactors
Nonbreeding
Light-Water Moderated
Boiling Water Cooled