長大結晶粒積層組織を有するMo板の高温強度 High-Temperature Strength of Molybdenum Sheets with Elongated Coarse-Grain Structures

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Molybdenum sheets with two types of elongated coarse-grain structures (trade name: TEM) were developed by heavy-duty rolling and recrystallization treatment of sintered molybdenum bodies with 1mass% La<SUB>2</SUB>O<SUB>3</SUB>. One type of sheets has spindle-like grains (S-TEM), and the other has stacked, plate-like grains (P-TEM). Tensile tests were carried out on S-TEM and P-TEM at 1470K to 2070K in vacuum to investigate the effects of grain structure on tensile properties such as proof strength (σ<SUB>y</SUB>), tensile strength (σ<SUB>m</SUB>) and uniform elongation (δ<SUB>m</SUB>) at high temperatures. The aspect ratio (L<SUB>TD</SUB>/W, L<SUB>RD</SUB>/W) of grains, i.e., ratio of grain length (L) to grain width (W) on the transverse plane and perpendicular plane to the rolling direction, were estimated as a parameter of grain structure. The following results were obtained.<BR>(1) TEM with elongated coarse-grain structures (S-TEM and P-TEM) had a higher σ<SUB>y</SUB> and σ<SUB>m</SUB> than pure molybdenum and TZM with equiaxial-grain structures. At 2070K, the σ<SUB>y</SUB> and σ<SUB>m</SUB> of TEM were 2-3 times those of pure molybdenum.<BR>(2) The σ<SUB>y</SUB> and σ<SUB>m</SUB> of TEM increased with increased L<SUB>TD</SUB>/W, and strain hardening was difficult to perform with increased L<SUB>RD</SUB>/W.<BR>(3) Three distinct failure modes were found. The higher the test temperature, the smaller the reduction area in the case of S-TEM with small L<SUB>TD</SUB>/W grains. In P-TEM with large LTD/W grains, the reduction was not dependent on temperature, although P-TEM indicated a larger reduction compared to S-TEM. In pure molybdenum and TZM, the higher the test temperature, the larger the reduction.

収録刊行物

  • 粉体および粉末冶金  

    粉体および粉末冶金 46(5), 489-495, 1999-05-15 

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002262442
  • 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
    4737242
  • 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  NDL  J-STAGE 
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