Ni 基単結晶超合金のラフト組織

Takuma Saito, Hiroshi Harada, Tadaharu Yokokawa, Makoto Osawa, Kyoko Kawagishi, Shinsuke Suzuki

研究成果: Article査読


Series of Ni–base single–crystal superalloys with superior thermal durability have been developed to improve thermal efficiency of gas turbine systems. Microstructural transition during creep so called “raft structure” formation enhances creep properties at lower stress and higher temperature condition. Furthermore, larger perfection degree of the raft structure contributes to better creep properties under the same creep condition. To control the perfection degree of the raft structure, magnitude of a lattice misfit and an elastic misfit between γ and γA phases should be controlled. In the current situation, the lattice misfit can be controlled by using alloy design program NIMS has developed. In this review, we focused on the role of the raft structure in alloy design. Observation results and predicted mechanisms about strengthening by the microstructural transition, in addition to the mechanism about microstructural transition itself during creep, were summarized and explained. Finally, under these recognitions mentioned above, our effort to establish a new alloy design approach to control the perfection degree of the raft structure by modifying the elastic misfit was introduced.

寄稿の翻訳タイトルRaft Structure of Nickel Base Single–Crystal Superalloys
ジャーナルNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
出版ステータスPublished - 2022


  • creep strength
  • elastic misfit
  • nickel–base single–crystal superalloys
  • raft structure

ASJC Scopus subject areas

  • 凝縮系物理学
  • 材料力学
  • 金属および合金
  • 材料化学


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