Microstructure and Mechanical Property of α+β Type Ti-(0~10)mass%V-(0.5~1)mass%O Alloys

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  • Ueda Kyosuke
    Department of Materials Processing, Graduate School of Engineering, Tohoku University
  • Kobayashi Tatsuya
    Department of Materials Processing, Graduate School of Engineering, Tohoku University
  • Narushima Takayuki
    Department of Materials Processing, Graduate School of Engineering, Tohoku University

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Other Title
  • α+β 型 Ti-(0～10)mass%V-(0.5～1)mass%O 合金の組織と機械的特性
  • Microstructure and Mechanical Property of a＋b Type Ti-(0～10)mass%V-(0.5～1)mass%O Alloys
  • a+vガタ Ti-(0~10)mass%V-(0.5~1)mass%O ゴウキン ノ ソシキ ト キカイテキ トクセイ
  • Microstructure and Mechanical Property of α+β Type Ti-(0~10)mass%V-(0.5~1)mass%O Alloys

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Abstract

  The microstructure and mechanical properties of the α+β type Ti-V-O alloys with high oxygen content were investigated. Ti-(0~10)mass%V-(0.5, 0.75, 1.0)mass%O alloy ingots were prepared using arc melting and hot rolling at 1373 K and 1073 K. The alloys were heat-treated at temperatures varying from 923 K to 1323 K for 3.6 ks under Ar flow. The β transus of the alloys was experimentally determined, and its value decreased with increasing V content and decreasing oxygen content in the alloy. Athermal ω was detected in the alloys with 6, 8 and 10 mass%V content and 0.5, 0.75 and 1 mass%O content after heat treatment at low temperatures in the range of 923 to 1123 K, wherein the V content in the β phase was higher than 12 mass%. The formation of the athermal ω led to the increase in hardness and decrease in the elongation and reduction of area of the alloys. Based on the investigation results, it was suggested that the Ti-4 mass%V-(0.5~0.75)mass%O alloy had an excellent balance between strength and ductility.<br>

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