La_2O_3添加Mo板における長大結晶粒積層組織の形成と機械的性質 Elongated Coarse-Grain Structure and Mechanical Properties of La_2O_3 doped Molybdenum Sheets

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Molybdenum sheets (trade name: TEM) having elongated coarse-grain structures were developed. The grain structures were controlled by hot and cold rolling under high total reduction ratio (ε<SUB>t</SUB>) and recrystallization treatment at 2070K of sintered Mo body with lmass% of La<SUB>2</SUB>O<SUB>3</SUB>.<BR>The recrystallization temperatures of La<SUB>2</SUB>O<SUB>3</SUB>-doped Mo sheets which were examined in terms of Vickers hardness and optical microstructure were higher than those of pure-Mo and TZM (Mo-0.56Ti-0.086Zr-0.016C by mass%) sheets. In particular, that of the La<SUB>2</SUB>O<SUB>3</SUB>-doped Mo sheet with high ε<SUB>t</SUB> of 99.1 % was about 1830K, 400K higher than that of the pure-Mo sheet.<BR>The deformation resistance of TEM sheets having elongated coarse-grain structures, which was examined by sag tests at 1470K to 2070K, were superior to those of the pure-Mo and TZM sheets with equiaxial grains. In particular, deformation resistance was improved at aspect ratios (L/W) exceeding 20. Sag value of TEM sheets with L/W=150 after sag test for 36ks at 2070K was less than 1/100 that of pure-Mo sheet and less than 1/60 of TZM sheet.<BR>The shock resistance of TEM sheets with L/W=150 at room temperature, which was examined by the falling-weight impact test, was superior to that of the pure-Mo sheet with equiaxial grains.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 45(5), 453-458, 1998-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002015610
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4481802
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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