Microbeam synchrotron radiation diffraction and fluorescence study of oxide layers formed on 9Cr ODS steel in supercritical water

Arthur Thompson Motta, Andrew D. Siwy, Jamie M. Kunkle, Jeremy B. Bischoff, Robert J. Comstock, Yun Chen, Todd R. Allen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations

Abstract

Uniform corrosion is a major concern for ferritic-martensitic steels when considered as candidate materials for the supercritical water reactor (SCWR). The corrosion rate depends on alloy composition and microstructure. The corrosion rate depends on alloy composition and microstructure. The best ferritic-martensitic alloys resist corrosion by developing a protective oxide layer that stabilizes oxide growth. To better understand the protection and stabilization mechanism, the structure of oxide layers formed on ferritic-martensitic alloys in supercritical water is studied using both transmission electron microscopy and microbeam synchrotron radiation diffraction and fluorescence. Using the microbeam it is possible to determine phases present using x-ray diffraction and chemical composition using x-ray fluorescence, both as a function of location in the oxide layer. The detailed study of phases present and elemental segregation at interfaces is presented for an oxide formed on 9Cr ODS steel after exposure to supercritical water for 667 hours. In the diffusion layer, both metal and oxide peaks are seen indicating a coexistence of the two phases in the diffusion layer. In the Cr-rich inner layer, a mixture of spinel phase FeCr2O4 and Fe3O 4 is observed, while in the outer oxide layer, Fe3O 4 is the predominant phase. Evidence for additional Cr-rich phases near the interfaces is also shown.

Original languageEnglish (US)
Title of host publicationProceedings - CIS Workshops 2007, 2007 International Conference on Computational Intelligence and Security Workshops, CISW 2007
Pages1501-1513
Number of pages13
StatePublished - Dec 1 2007
Event13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007 - Whistler, BC, Canada
Duration: Apr 19 2007Apr 23 2007

Publication series

NameCanadian Nuclear Society - 13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
Volume3

Other

Other13th International Conference on Environmental Degradation of Materials in Nuclear Power Systems 2007
CountryCanada
CityWhistler, BC
Period4/19/074/23/07

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Safety, Risk, Reliability and Quality
  • Materials Science(all)

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