About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Understanding Corrosion-Related Cracking
|
| Presentation Title |
Understanding Pit Morphological Features that Initiate SCC in SS304H used for Nuclear Waste Storage Canisters |
| Author(s) |
Daria Bentley, Timothy Burnett, Jenifer Locke |
| On-Site Speaker (Planned) |
Daria Bentley |
| Abstract Scope |
Dry cask stainless steel nuclear waste storage canisters are susceptible to stress corrosion cracking when salts deliquescence on the surface. The soluble type and concentration of salts varies with relative humidity (RH) causing pits with unique morphological features to develop. Under low RH conditions, pits that emanating cracks without an externally applied stress are common whereas relatively hemispherical pits develop at high RH. This work aims to identify features for a range of morphologies that act to nucleate SCC preferentially through use of FIB cross-sectional SEM and micro/nano-XCT. Results for pitted tensile bars loaded with and without applied stress in various RH simulated environments will be presented. All data will be integrated into a machine learning model under development by Idaho National Laboratory aimed at predicting the likelihood of distinct morphologies transitioning into long propagating cracks to mitigate premature failure. |