Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys

Satoru Kobayashi, Tomoki Otsuka, Rikuryo Watanabe, Kyosuke Sagitani, Masaki Okamoto, Kako Tokutomi

研究成果: Conference contribution

抄録

Alloying effects on the competition between discontinuous and continuous precipitation of δ-Ni3Nb (D0a) phase and η-Ni3Ti (D024) phase were investigated in model Ni-Cr-Fe-Nb and Ni-Ti-based alloys, respectively, to aim at designing polycrystalline Ni based superalloys with better temperature capability. Discontinuous precipitation tends to occur at lower temperatures, while continuous precipitation dominates at higher temperatures in the two alloy systems. The addition of Mo promotes continuous precipitation with respect to discontinuous precipitation while that of Ti promotes discontinuous precipitation rather than continuous precipitation in δ phase precipitation alloys. A replacement of Ti with Mo promotes continuous precipitation with respect to discontinuous precipitation in η phase precipitation alloys at 800 °C. The observed alloying effects are discussed in terms of chemical driving force, interfacial energy between the matrix phase and the δ(η) phases, and coherency strain caused by the formation of the metastable phases prior to the formation of δ/η phases.

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163-170
ページ数8
ISBN(印刷版)9783030518332
DOI
出版ステータスPublished - 2020
外部発表はい
イベント14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States
継続期間: 2021 9月 122021 9月 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

フィンガープリント

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