Acoustic emission from stress corrosion crack initiation and growth in Type 304 SS
- Pacific Northwest Lab., Richland, WA (United States)
Acoustic emission (AE) studies of intergranular stress corrosion crack (IGSCC) initiation and growth and pit initiated crack initiation have been conducted. IGSCC occurs with a moderate number of AE events, on the order of 20 ev/mm{sup 2} of crack extension, for both crack initiation and growth processes. There was no obvious difference in the AE signal amplitude or risetime distributions for crack initiation or growth. Acoustic emission appear to emanate from plastic zone formation ahead of the crack tip and ligament or inclusion failure behind the crack. Pitting was found to occur with a significant number of AE events but there was no evidence that transgranular stress corrosion (TGSCC) produced measurable AE. The source of the AE from pitting was suggested as being from the rupture of salt caps over the pits. These results suggest that AE is a potential tool for monitoring stress corrosion cracking of reactor piping; however, development of methods to discriminate between AE from stress corrosion and other reactor noise will be necessary.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 48065
- Report Number(s):
- CONF-910808--
- Country of Publication:
- United States
- Language:
- English
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