Equations to Predict the Elastic Modulus of the Individual Gamma and Gamma-Prime Phases in Multi-component Ni-Base Superalloys

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

*この研究の対応する著者

研究成果: Conference contribution

抄録

Strength of Ni-base single-crystal superalloys under high temperature and low stress creep usually is enhanced by formation of γ/γ′ raft structure and larger aspect ratio of γ′ phase in the γ/γ′ raft structure. Elastic misfit between γ and γ′ phases is one of the most important factors to control the aspect ratio of the γ′ phase in the γ/γ′ raft structure formed under external stress. The aspect ratio of the γ′ phase is controlled by kinetics for the γ/γ′ raft structure formation, which is affected by a strain inhomogeneity caused by this elastic misfit between the γ and γ′ phases under external stress. To realize a new alloy design approach to control the aspect ratio of the γ′ phase in the γ/γ′ raft structure, this research aimed to obtain the regression equations which can predict elastic modulus of the individual γ and γ′ phases for multi-component Ni-base single-crystal superalloys based on measurements of elastic modulus of Ni-base single-crystal alloys. Elastic modulus of the individual γ and γ′ phases of various kinds of Ni-base single-crystal alloys was measured by using rectangular parallelepiped resonance (RPR) method. Using the analyzed and referenced elastic modulus, regression equations for predicting <100> longitudinal elastic modulus of the individual γ and γ′ phases and its temperature and composition dependence were obtained. Detailed analysis of the elastic modulus and its composition dependence was executed to clarify the contribution of each element on the elastic modulus. At 900 °C, Re, Ta, Ti, Al, and Mo reduce the <100> longitudinal elastic modulus in the γ phase. On the other hand, Ru, Re, Ta, Ti, Al, W, and Mo enlarge the elastic modulus in the γ′ phase.

本文言語English
ホスト出版物のタイトルSuperalloys 2020 - Proceedings of the 14th International Symposium on Superalloys
編集者Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
出版社Springer Science and Business Media Deutschland GmbH
ページ312-323
ページ数12
ISBN(印刷版)9783030518332
DOI
出版ステータスPublished - 2020
イベント14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States
継続期間: 2021 9 122021 9 16

出版物シリーズ

名前Minerals, Metals and Materials Series
ISSN(印刷版)2367-1181
ISSN(電子版)2367-1696

Conference

Conference14th International Symposium on Superalloys, Superalloys 2021
国/地域United States
CitySeven Springs
Period21/9/1221/9/16

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー工学および電力技術
  • 材料力学
  • 金属および合金
  • 材料化学

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