STP1047

    The Effect of Composition and Phase on Segregation of Fe-Cr Based Alloys

    Published: Jan 1990


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    Abstract

    The segregation behavior of Fe-Cr-Mn alloys during electron-irradiation was studied using a high-voltage electron microscope at a temperature range between 723 and 823 K. The ferritic Fe-7Cr-3Mn, Fe-5Cr-5Mn, and Fe-3Cr-7Mn alloys and the austenitic Fe-10Cr-15Mn and Fe-10Cr-15Mn-3Al alloys were used. Irradiation-induced segregation was observed for all of the Fe-Cr-Mn alloys. That is, manganese tended to enrich and chromium deplete near grain boundaries. However, both manganese and chromium were enriched to high concentrations not only at grain boundaries but also in the grain so that new phases were formed. Furthermore, the amount of segregation depended on the initial manganese and chromium solute concentration along with the aluminum addition. From these results it is suggested that compositional changes due to enrichment or depletion or both can result in a phase transformation during irradiation, even local phenomena.

    Keywords:

    radiation-induced segregation, Fe-Cr-Mn alloy, phase transformation, grain boundary


    Author Information:

    Takahashi, H
    Professor, graduate student, associate professor, and instructor, Hokkaido University, Sapporo,

    Shiba, K
    Professor, graduate student, associate professor, and instructor, Hokkaido University, Sapporo,

    Nakahigashi, S
    Leader of group, Nuclear Engineering Laboratory, Toshiba Corporation, Kawasaki,

    Ohnuki, S
    Professor, graduate student, associate professor, and instructor, Hokkaido University, Sapporo,

    Kinoshita, H
    Professor, graduate student, associate professor, and instructor, Hokkaido University, Sapporo,

    Garner, FA
    Chairman of group, Pacific Northwest Laboratory, Richland, WA


    Paper ID: STP24951S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP24951S


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