β型Ti-Mo合金単結晶の時効および焼入れ硬化に及ぼす結晶方位と表面状態の影響

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タイトル別名
  • Effects of Crystal Orientation and Surface Conditions on Age and Quench Hardening of Beta Titanium-Molybdenum Alloy Single Crystals
  • ベータガタ Ti Mo ゴウキン タンケッショウ ノ ジコウ オヨビ ヤキイレ

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抄録

The age hardening of Ti-14 and 20 wt%Mo alloys at 623 K was investigated with their plate-like single crystal, bicrystal and polycrystal specimens in relation to crystal orientation and quenching strain induced by rapid cooling from 1223 K or 998 K for 20Mo and from 1223 K for 14Mo. The asquenched ω phase in single crystals showed higher hardness near the surface than that in the interior, when the specimen was mechanically abraded to a given depth. This phenomenon seemed to be influenced by solute oxygen and/or induced surface strain. The increase in age hardening in the interior, after a certain aging, kept up with that near the surface just under the contaminated layer (10-15 μm). The specimen with {110} surface hardened more quickly than that with {111} surface. The anisotropy of aging speed was verified with {320} and {211} surfaces of bicrystals (20Mo) for the quenching temperatures 1223 and 998 K. The effect of quenching temperature on age hardening was explained by the difference in the amount of quenched-in vacancies controlling the time period to the appearance of maximum hardness. After a long time aging, the interior of bicrystals showed a remarkable retardation of the age hardening.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 50 (10), 893-899, 1986

    公益社団法人 日本金属学会

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