Influence of Alloy Microstructure on Oxide Growth in HCM12A in Supercritical Water

Jeremy Bischoff, Arthur T. Motta, Lizhen Tan, Todd R. Allen
2008 Materials Research Society Symposium Proceedings  
HCM12A is a ferritic-martensitic steel alloy envisioned for cladding and structural material in the Generation IV Supercritical Water Reactor (SCWR). This alloy was oxidized in 600ºC supercritical water for 2, 4 and 6 weeks, and the oxide layers formed were analyzed using microbeam synchrotron radiation and electron microscopy. The oxide layers show a three-layer structure with an Fe 3 O 4 outer layer, an inner layer containing a mixture of Fe 3 O 4 and FeCr 2 O 4 and a diffusion layer
more » ... g FeCr 2 O 4 and Cr 2 O 3 precipitates along ferrite lath boundaries. The base metal microstructure has a strong influence on the advancement of the oxide layers, due to the segregation at the lath boundaries of chromium rich particles, which are oxidized preferentially.
doi:10.1557/proc-1125-r06-05 fatcat:fxbiaqldunbqbnts6gnlfgq3ai