Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c

Nick Tepylo, Xiao Huang, Shengli Jiang, Sami Penttilä

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.
    Original languageEnglish
    Article number011014
    JournalJournal of Nuclear Engineering and Radiation Science
    Volume5
    Issue number1
    DOIs
    Publication statusPublished - 2019
    MoE publication typeNot Eligible

    Fingerprint

    cementation
    stainless steels
    Stainless steel
    water
    Water
    materials selection
    spallation
    hematite
    spinel
    Hematite
    x rays
    aluminum oxides
    electron microscopes
    reactors
    X ray diffraction analysis
    coatings
    Electron microscopes
    scanning
    Alumina
    oxides

    Cite this

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    title = "Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c",
    abstract = "The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.",
    author = "Nick Tepylo and Xiao Huang and Shengli Jiang and Sami Penttil{\"a}",
    year = "2019",
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    language = "English",
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    Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c. / Tepylo, Nick; Huang, Xiao; Jiang, Shengli; Penttilä, Sami.

    In: Journal of Nuclear Engineering and Radiation Science, Vol. 5, No. 1, 011014, 2019.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Huang, Xiao

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    AU - Penttilä, Sami

    PY - 2019

    Y1 - 2019

    N2 - The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.

    AB - The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.

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