β相焼入れTi-Fe-Cr β合金の引張特性に及ぼすCr添加の影響

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タイトル別名
  • Effect of Cr Addition on Tensile Properties of Ti-Fe-Cr beta Alloys Quenched From Beta Single Phase Region at 1173 K
  • ベータソウ ヤキイレ Ti Fe Cr ベータ ゴウキン ノ ヒッパリ トクセイ ニ オヨボス Cr テンカ ノ エイキョウ

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抄録

In beta quenched Ti-Fe-Cr alloys prepared using ferro-chromium alloy, pure Fe or pure Cr and as targeting composition to electron-to-atom ratio (e/a) of 4.28, phase constitution and tensile properties were investigated by electrical resistivity measurement, X-ray diffraction and tensile testing.<BR>In all alloys, beta phase was only identified by X-ray diffraction at room temperature. Resistivity and Vickers hardness decreased with increase in Cr content as a substitute for Fe on condition that 4.28 as e/a is maintained, whereas resistivity ratio increased with Cr content. These changes will be due to decrease in volume fraction of athermal omega with increase in Cr content.<BR>Tensile strength slightly decreased with increase in Cr content, whereas elongation and reduction in area obviously increased. The tensile properties of the quenched Ti-Fe-Cr alloys were not worse than those of commercial beta Ti alloys, excepting Ti-7.1Fe alloy. It is considered that addition of Cr as a substitute for Fe will improve balance between tensile strength and ductility.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 64 (5), 279-282, 2000

    公益社団法人 日本金属学会

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