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

Published online by Cambridge University Press:  15 March 2011

Jeremy Bischoff
Affiliation:
Department of Mechanical and Nuclear Engineering, Pennsylvania State University, 227 Reber Building, University Park, PA, 16802, USA.
Arthur T. Motta
Affiliation:
Department of Mechanical and Nuclear Engineering, Pennsylvania State University, 227 Reber Building, University Park, PA, 16802, USA.
Lizhen Tan
Affiliation:
Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA.
Todd R. Allen
Affiliation:
Department of Engineering Physics, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, WI 53706, USA.
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Abstract

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 600°C 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 Fe3O4 outer layer, an inner layer containing a mixture of Fe3O4 and FeCr2O4 and a diffusion layer containing FeCr2O4 and Cr2O3 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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

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References

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