Ni基のNi-Cr-Coオーステナイト合金の耐熱性について

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タイトル別名
  • On the High Temperature Properties of the Ni-base Ni-Cr-Co Austenitic Alloys
  • Niキ ノ Ni-Cr-Co オーステナイト ゴウキン ノ タイネツセイ ニ ツイテ

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This investigation was made to evaluate the high temperature properties of Ni-Cr-Co austenitic alloys containing up to 40%Co with Cr fixed at 20%. The alloys were examined at both the 20% cold-rolled state after solution-quenching at 1200°C and the water-quenched state at 1200°C after the cold-rolling. The results were as follows: The alloys harden with the increase of the Co content of the alloys due to the cold-rolling. The recrystallization temperature of the alloys exists at about 800°C, and appears to be a little lowered with increase of the Co content. The bending creep ductility was measured by the deflection in the creep test, the values being smaller in the cold-rolled specimens than that of the water-quenched one at 1200°C after the cold-rolling. In the cold-rolled specimens, the deflections are very small, and the rupture times are short in alloys of low Co content. Among the water-quenched specimens at 1200°C after the cold rolling, the alloy containing about 30%Co was found to be minimum in the deflection and long in the rupture time. The weight increase due to the heating at 800°C for 100 hr in air is minimum in the 25%Co specimen. It can be said that the alloys containing 20 to 30%Co are the strongest in the high temperature strength. The addition of nitrogen hardens the alloys and raises the recrystallization temperature, and the oxidation resistivity at high temperatures is somewhat improved, although the rupture time in the bending creep test is shortened.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 24 (9), 578-580, 1960

    公益社団法人 日本金属学会

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