Ti-6Al-4V合金の熱処理と機械的性質について

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タイトル別名
  • Heat-Treatments and the Mechanical Properties of Ti-6Al-4V Alloy
  • Ti-6Al-4V ゴウキン ノ ネツ ショリ ト キカイテキ セイシツ ニ ツイテ

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抄録

Heat-treatments and the mechanical properties of Ti-6Al-4V alloy, a representative α+β type titanium alloy, were investigated. A homogenous ingot of the alloy was prepared by consumable-electrode double-arc melting. Quenching tests from various temperatures have revealed that α-β transus occurs between 1000° and 1050°C and the quenched structure from β phase is α′, and that the minimum hardness was obtained when the alloy was quenched from the temperature range of 700°∼800°C and the hardness rapidly rose when it is quenched from temperature levels above 900°C. Aging tests of specimens solution-treated at 850°, 950° and 1100°C were carried out at various temperatures from 200° to 600°C for various periods from 30 min to 4 hr. The hardness rose to the maximum at the aging temperature within the range of 400°∼500°C and rose with rise of the temperature of solution-treatment. The tensile strength, the elongation and the reduction in area of the annealed specimens (700°C×2 hrs, furnace-cooled) were 100 kg/mm2, 16% and 44%, respectively, in room-temperature tests. In the high-temperature tests up to 700°C,only the tensile strength was reduced but the other values increased. The Charpy impact value in room-temperature test was 5 kgm/cm2, but increased under higher temperature. The tensile strength of specimens aged at 450°∼550°C for 24 hrs after solution treating at 850°∼950°C rose with the rise of the solution-treating temperature and the drop of aging temperature. Creep and creep-rupture tests of heat-treated specimens, solution-treated at 850° and 950°C and aged at 550°C for 24 hrs, were carried out at 427°C(800°F) under the stress of 25.6 kg/mm2 and 63.3 kg/mm2, respectively. The creep-resistance and the creep-rupture time increased with the rise of temperature of solution-treatment. The lowest creep strength was obtained with annealed specimens.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 26 (9), 601-606, 1962

    公益社団法人 日本金属学会

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