Creep-Rupture Life and Alloy Manufacturing Criterion Related to the Solidification and Precipitation Temperatures in Nickel-based Single Crystal Superalloys

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  • ニッケル基単結晶超合金の凝固・析出反応温度とクリープ破断寿命および製造性との関係
  • ニッケルキ タンケッショウ チョウゴウキン ノ ギョウコ セキシュツ ハンノウ

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Abstract

The solidification and precipitation temperatures were measured and were correlated with the creeprupture property and the microstructure of nickel-based single crystal superalloys. For three Co-content varying Ni-10 mol% Cr-12 mol% Al-1.5 mol% Ti-Ta-W-Mo-0.25 mol% Re-0/4.5/9.0 mol% Co alloys and also for three Cr-content varying Ni-10/13/16 mol% Cr-12 mol% Al-1.2 mol%Ti-Ta-W-Mo alloys, the liquidus, solidus, eutectic γ'precipitation and γ'solvus temperatures were determined by differential thermal analysis (DTA). It was found that as the Co and Cr contents increased, the γ'solvus temperature decreased and there was the attendant decrease in the volume fraction of the γ' phase in the alloys. In response to these changes the creep-rupture lives decreased with the Co and Cr contents. These results imply that the γ' solvus temperature is an indication of the creep-rupture lives of the nickel-based superalloys. In addition, a manufacturing condition for single-crystal growth was estimated from the measured solidification temperature range of alloys. All of the six alloys were shown to meet this condition, and their single crystals were grown successfully in agreement with the estimation.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 78 (5), 814-820, 1992

    The Iron and Steel Institute of Japan

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