Evaluation of stress corrosion crack initiation using acoustic emission
- Pacific Northwest Lab., Richland, WA (United States)
- Electric Power Research Inst., Palo Alto, CA (United States)
This paper reports that acoustic emission response has been used to detect the development of short intergranular stress corrosion cracks in laboratory samples of sensitized type 304 (UNS S30400) stainless steel (SS). Test were conducted at 25{degrees}C in water containing either 15 ppm of Na{sub 2}S{sub 2}O{sub 3} or 100 ppm of NaCl. Cylindrical samples with piezoelectric detectors mounted on both ends and the corrosion cell confined to the gauge section were used. The dual detectors allowed discrimination between signals generated within the sample from those generated from the surroundings. It was found that intergranular stress corrosion cracks of 200 to 300 {mu}m length by 100 to 200 {mu}m depth could be reliably detected with this technique. Shallow 10-{mu}m deep longitudinal flaws were also detected in tests conducted in the 100 ppm NaCl environment.
- DOE Contract Number:
- AC06-76RL01831; AC06-76RL01830
- OSTI ID:
- 7116151
- Journal Information:
- Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 47:2; ISSN CORRA; ISSN 0010-9312
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360102 -- Metals & Alloys-- Structure & Phase Studies
360105* -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
CORROSION
CORROSIVE EFFECTS
CRACK PROPAGATION
ELECTRICITY
HALIDES
HALOGEN COMPOUNDS
HIGH ALLOY STEELS
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS TESTING
MONITORING
NONDESTRUCTIVE TESTING
OXYGEN COMPOUNDS
PIEZOELECTRICITY
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
STAINLESS STEELS
STEELS
STRESS CORROSION
SULFATES
SULFUR COMPOUNDS
TESTING
WATER CHEMISTRY