真空焼結後HIP処理したTi-6Al-4V合金の引張性質 Tenisile properties of HIP'ed Ti-6Al-4V alloy after vacuum sintering

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The relationship between the microstructures and tensile propertie has been investigated for the vacuum sintered and vacuum sintered plus HIP'ed Ti–6 mass%Al–4 mass%V (Ti–6–4) which are produced by blending pure titanium powders with Al–42 mass%V master alloy powders. The microstructure changes with vacuum sintering temperatures and is classified into two types, (1) Type 1: For materials sintered at temperatures below 1400 K, the microstructure consists of lenticular α-phase plates with relatively low aspect ratio, and β phase. (2) Type 2: For materials sintered at temperatures above 1400 K, the microstructure consists of α/β lamellar surrounded by grain boundary α-phase. For the materials of type 1, density, tensile stress and ductility increase with increasing sintering temperature. On the other hand, for the materials of type 2, density and tensile stress increase monotonously with increasing sintering temperature but ductility decreases with increasing temperature to 1473 K and increases above this temperature. Higher densification and improvement of tensile properties are achieved by HIP treatment for the materials sintered in vacuum at temperatures above 1273 K. Microstructure of the HIP'ed materials above the β transus is that of type 2 and ductility decreases with increasing average size of grain boundary α-phase. The materials, HIP'ed below the β transus with the microstructure of type 1 show excellent 0.2% proof stress, tensile stress and ductility. It is concluded that HIP treatment (1073–1173 K) below the β transus is effective for obtaining microstructure of type 1, which leads to the improvement of the tensile properties.

収録刊行物

  • 軽金属

    軽金属 46(8), 371-376, 1996-08-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003794282
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    4021306
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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