日本金属学会誌
第5世代単結晶超合金TMS-173のクリープ強度におよぼす添加元素の影響
小林 敏治小泉 裕原田 広史横川 忠晴張 建新佐藤 敦史佐藤 彰洋
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69 巻 (2005) 2 号 p. 241-244

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  The relationships between the microstructure and the amount of alloying elements, Ru, Ta and Nb, in the 5th generation Ni-base single crystal superalloy TMS-173 (TMS-138++), which was developed by the authors, were investigated. TMS-173 was employed as the master alloy and three types of alloys were produced; one with 1 mass%Ru, another with a reduction of 0.6 mass%Ta and an addition of 0.5 mass%Nb, and another with a reduction of 0.4 mass%Ta. Using these alloys, the effects of the alloying elements on microstructure and the creep strength were investigated.
   Under 900°C-392 MPa creep test condition, all three alloys had longer rupture lives than the master alloy TMS-173. In particular, the alloy with 0.4 mass% reduction in Ta content exhibited an increase of approximately 35%, and under 1100°C-137 MPa condition, the alloy with a reduction of 0.6 mass%Ta and an addition of 0.5 mass%Nb exhibited approximately 50% increase in the creep rupture life. From the microstructural analysis, it is suggested that the increased creep strength at 900°C was achieved because the precipitation of TCP phases was inhibited through the increased microstructural stability, and the creep strength at 1100°C was governed mainly by the spacing of γ/γ′ interfacial dislocation network.

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© 2005 (公社)日本金属学会
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