Acoustic emission during pitting and transgranular crack initiation in type 304 stainless steel

Journal Article · Tue Sep 01 04:00:00 EDT 1992 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3315996· OSTI ID:7187803

Jones, R H; Friesel, M A ^[1]

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1. Pacific Northwest Lab., Richland, WA (United States)

This paper reports that the acoustic emission (AE) response of a low-carbon type 304 stainless steel (SS) (UNS S30400) during pitting and transgranular stress corrosion cracking (TGSCC) has been measured. Tests were conducted in 0.01 and 1 M NaCl with the pH adjusted to 1 with HCl at potentials of -380 mV and 0 mV (SCE) for no applied stress and with a stress equal to 75% of the yield strength of the material. Acoustic emission signals were detected using piezoelectric sensors attached to each end of cylindrical samples. The two detectors allowed the discrimination between signals generated within the sample gauge section from those generated elsewhere. The AE activity during pitting corrosion was significant; it was concluded that the AE signals did not emanate from cracking or dislocation activity. Applied stress exhibited an inconsistent effect on the AE rate, but it did shorten the transition time from low to high AE rates. The AE rate increased slightly with increasing sample current in 0.01 M NaCl and with increasing corrosion rate, resulting form an increase in salt concentration from 0.01 to 1 M NaCl. Hydrogen and oxygen gas bubble formation was not observed on the samples, and the electrochemical conditions were not consistent with their formation; therefore, AE form bubble formation was ruled out.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 7187803
• Journal Information: Corrosion (Houston); (United States), Journal Name: Corrosion (Houston); (United States) Vol. 48:9; ISSN 0010-9312; ISSN CORRAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ACOUSTIC EMISSION TESTING
ACOUSTIC TESTING
ALKALI METAL COMPOUNDS
ALLOYS
AUSTENITIC STEELS
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
CORROSION
CORROSION RESISTANT ALLOYS
CRACKING
DECOMPOSITION
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MATERIALS TESTING
NICKEL ALLOYS
NONDESTRUCTIVE TESTING
PITTING CORROSION
PYROLYSIS
SODIUM CHLORIDES
SODIUM COMPOUNDS
STAINLESS STEEL-304
STAINLESS STEELS
STEEL-CR19NI10
STEELS
STRESSES
TESTING
THERMOCHEMICAL PROCESSES