Precipitation Behavior of Irradiated Reduced-Activation Ferritic Steels

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In order to study the effects of small additional elements on precipitation behavior in reduced-activation ferritic steels under neutron irradiation, analytical transmission electron microscopy was used to examine the microstructure and the precipitation of the extraction replica of several reduced activation ferritic/martensitic steels which have different contents of small additional elements after 60 displacements per atom (dpa) irradi-ation at 693, 698 and 733 K in the Fast Flux Test Facility (FFTF)/Materials Open Test Assembly (MOTA). All of reduced-activation ferritic/martensitic steels were found to have a good phase stability after irradiation. Micro-voids were observed in both materials of Fe-9Cr-2W with or without boron, the density of micro-voids in the steel with boron is larger than that without boron, and the mean size of micro-voids is smaller than that without boron. However void swelling was less than 1%. Most of the precipitates in the irradiated specimens were found to be M<SUB>23</SUB>C<SUB>6</SUB> which consists of mainly Cr. The remainder of the precipitates were found to be Ta-rich M<SUB>6</SUB>C. Laves phase was observed only at 733K. Several precipitates which were Ti-rich including Si and W were also observed at grain boundary in Ti addition steels at 733 K irradiation. Several Y<SUB>2</SUB>O<SUB>3</SUB> particles were observed in an yttrium containing alloy. No precipitation including Al was observed in an Al containing alloy. Ti addition decreased precipitation of Ta-rich M<SUB>6</SUB>C in 9Cr and 12Cr steels in this irradiation condition.

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  • Journal of nuclear science and technology  

    Journal of nuclear science and technology 33(9), p.721-727, 1996-09-25 

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002075476
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • NDL 記事登録ID
    4060429
  • NDL 雑誌分類
    ZM35(科学技術--物理学)
  • NDL 請求記号
    Z53-A460
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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