About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Progressive Solutions to Improve the Corrosion Resistance of Nuclear Waste Storage Materials
|
| Presentation Title |
Prediction of pitting and stress corrosion crack initiation in SS 304 waste storage containers |
| Author(s) |
Lucille V. Dentice, Nathan Gehmlich, Thang Duc Nguyen, Ronit Roy, Rebecca Schaller, Mychailo Toloczko, Maria Okuniewski, Janelle P. Wharry |
| On-Site Speaker (Planned) |
Lucille V. Dentice |
| Abstract Scope |
This talk elucidates correlations between SS 304 surface microstructure and the initiation of chloride-induced stress corrosion cracking (CISCC). CISCC is a failure mode of concern in dry cask storage systems for nuclear waste. While there exists a firm fundamental understanding of CISCC propagation behavior, there is relatively little literature on crack initiation and the so-called pit-to-crack transition. This study employs electron backscatter diffraction to preliminarily map the grain structure of an SS 304L weldment. After corrosion in boiling MgCl2 under tensile strain at various time intervals, samples are remapped, and correlations are drawn between microstructure and emerging corrosion features. Pits and crack initiation are linked to particular grain structures, orientations, and interfaces. Implications for future experimental and modeling studies are discussed. |