Ni-Cr-Al-Ta-W(-Co) 系ニッケル基単結晶超合金の高温特性と Ta/W 組成比の関係

概要

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The optimum Ta/W compositional ratio was searched for in Ni-10/11 mol%Cr-12/14mol% Al-Ta-W (-5mol%Co) alloys in order to get an excellent combination of creep-rupture, phase stability and hot-corro-sion resistance in a Na_2SO_4-NaCl salt. Solidification and precipitation temperatures were also examined as a function of the Ta/W ratio. The γ′solvus temperature and the creep-rupture life were found to increase with increasing Ta/W ratio up to 1.0. However, when the ratio exceeded 1.0, the creep-rupture life reversely decreased probably due to the increase in the residual amount of the eutectic γ′phase in alloys. On the other hand, hot-corrosion resistance increased monotonously with the Ta/W ratio. From the present study it was concluded that the Ta/W compositional ratio of 0.5 to 1.0 was most suitable for balancing the high temperature properties in this alloy system.
社団法人日本鉄鋼協会の論文
1992-04-01