Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water

Mengqiang Gong, Zhangjian Zhou, Helong Hu, Sami Penttilä, Aki Toivonen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    The corrosion behavior and oxide layer structure of two 14Cr ODS (Oxide Dispersion Strenghtened) steels with or without alloying element of Al have been investigated in supercritical water (SCW) at 650℃/25MPa for exposure times of 100h, 300h and 1000h. The oxide structure was studied using scanning electron microscope (SEM), energy dispersion spectroscopy (EDS) and X-ray diffraction (XRD). Both ODS alloys showed a three-layer oxide structure after 1000h of exposure in SCW. The 14Cr-Al samples exhibited a structure with Fe2O3 in the outer layer, a mixture of (Cr, Fe)3O4 and (Al,Cr)2O3 in the inner layer, and a mixture of metal and oxide grains Al2O3 in the diffusion layer. The outer layer of Al-free samples consist of Fe2O3, the inner layer and the diffusion layer contain (Fe, Cr)3O4 and Cr2O3, respectively. Cracks, pores and exfoliations could be observed for both alloys after SCW exposure up to 1000h.
    Original languageEnglish
    Title of host publication Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015)
    PublisherVTT Technical Research Centre of Finland
    Number of pages9
    ISBN (Electronic)978-951-38-8289-1
    ISBN (Print)978-951-38-8290-7
    Publication statusPublished - 2015
    MoE publication typeB3 Non-refereed article in conference proceedings
    Event7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7 - Helsinki, Finland
    Duration: 15 Mar 201518 Mar 2015

    Publication series

    SeriesVTT Technology
    Number216

    Conference

    Conference7th International Symposium on Supercritical Water-Cooled Reactors, ISSCWR-7
    Abbreviated titleISSCWR-7
    CountryFinland
    CityHelsinki
    Period15/03/1518/03/15

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    Gong, M., Zhou, Z., Hu, H., Penttilä, S., & Toivonen, A. (2015). Corrosion behaviour of 14Cr ODS ferritic steels in a supercritical water. In Proceedings of the 7th International Symposium on Supercritical Water-Cooled Reactors (ISSCWR 2015) [2059] VTT Technical Research Centre of Finland. VTT Technology, No. 216