|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||Microstructure and Surface Chemistry of FeCrAl Alloys Accident Tolerant Fuel Cladding Subjected to Fast Heating Rate in Aqueous Environment
||Rajnikant V. Umretiya, Donghwi Lee, Mark Anderson, Raul B Rebak, Jessika Rojas
|On-Site Speaker (Planned)
||Rajnikant V. Umretiya
FeCrAl alloys, such as APMT and C26M, are excellent cladding candidates for accident-tolerant fuel (ATF) systems in light water reactors due to their high resistance to oxidation as a result of the formation of a protective Cr2O3 and Al2O3 scale at high temperatures. In order to understand their evolution at the early stage of high-temperature exposure in short periods, samples were exposed to flow boiling testing and heated to ~400 ēC within a second. Using scanning electron microscopy (SEM), ~100-200 nm thick oxide layer was confirmed. The surface chemistry of both alloys was characterized layer by layer using X-ray photoelectron spectroscopy (XPS) depth profiling. The results indicated a layer composed of oxides and hydroxides of Al, Cr, and Fe with varying proportions at different depths in the layer. After the tests, the average micro-hardness values were increased, and that was confirmed with higher mechanical properties acquired by ring compression testing.