Tensile properties of HIP'ed Ti-6Al-4V alloy after vacuum sintering.

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  • 真空焼結後ＨＩＰ処理したＴｉ‐６Ａｌ‐４Ｖ合金の引張性質
  • 真空焼結後HIP処理したTi-6Al-4V合金の引張性質
  • シンクウ ショウケツゴ HIP ショリシタ Ti 6Al 4V ゴウキン ノ

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Abstract

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.

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