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

doi:10.1007/978-3-030-51834-9_16

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

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Citations (Scopus)

Abstract

Alloying effects on the competition between discontinuous and continuous precipitation of δ-Ni₃Nb (D0_a) 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.

Original language	English
Title of host publication	Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys
Editors	Sammy Tin, Mark Hardy, Justin Clews, Jonathan Cormier, Qiang Feng, John Marcin, Chris O'Brien, Akane Suzuki
Publisher	Springer Science and Business Media Deutschland GmbH
Pages	163-170
Number of pages	8
ISBN (Print)	9783030518332
DOIs	https://doi.org/10.1007/978-3-030-51834-9_16
Publication status	Published - 2020
Externally published	Yes
Event	14th International Symposium on Superalloys, Superalloys 2021 - Seven Springs, United States Duration: 2021 Sept 12 → 2021 Sept 16

Publication series

Name	Minerals, Metals and Materials Series
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	14th International Symposium on Superalloys, Superalloys 2021
Country/Territory	United States
City	Seven Springs
Period	21/9/12 → 21/9/16

Keywords

Discontinuous precipitation
Microstructural design
Polycrystalline superalloys

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Energy Engineering and Power Technology
Mechanics of Materials
Metals and Alloys
Materials Chemistry

Access to Document

10.1007/978-3-030-51834-9_16

Cite this

Kobayashi, S., Otsuka, T., Watanabe, R., Sagitani, K., Okamoto, M., & Tokutomi, K. (2020). Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys. In S. Tin, M. Hardy, J. Clews, J. Cormier, Q. Feng, J. Marcin, C. O'Brien, & A. Suzuki (Eds.), Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys (pp. 163-170). (Minerals, Metals and Materials Series). Springer Science and Business Media Deutschland GmbH. https://doi.org/10.1007/978-3-030-51834-9_16

Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys. / Kobayashi, Satoru; Otsuka, Tomoki; Watanabe, Rikuryo et al.
Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. ed. / Sammy Tin; Mark Hardy; Justin Clews; Jonathan Cormier; Qiang Feng; John Marcin; Chris O'Brien; Akane Suzuki. Springer Science and Business Media Deutschland GmbH, 2020. p. 163-170 (Minerals, Metals and Materials Series).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Kobayashi, S, Otsuka, T, Watanabe, R, Sagitani, K, Okamoto, M & Tokutomi, K 2020, Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys. in S Tin, M Hardy, J Clews, J Cormier, Q Feng, J Marcin, C O'Brien & A Suzuki (eds), Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. Minerals, Metals and Materials Series, Springer Science and Business Media Deutschland GmbH, pp. 163-170, 14th International Symposium on Superalloys, Superalloys 2021, Seven Springs, United States, 21/9/12. https://doi.org/10.1007/978-3-030-51834-9_16

Kobayashi S, Otsuka T, Watanabe R, Sagitani K, Okamoto M, Tokutomi K. Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys. In Tin S, Hardy M, Clews J, Cormier J, Feng Q, Marcin J, O'Brien C, Suzuki A, editors, Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. Springer Science and Business Media Deutschland GmbH. 2020. p. 163-170. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-030-51834-9_16

Kobayashi, Satoru ; Otsuka, Tomoki ; Watanabe, Rikuryo et al. / Alloying Effects on the Competition Between Discontinuous Precipitation Versus Continuous Precipitation of δ/η Phases in Model Ni-Based Superalloys. Superalloys 2020 - Proceedings of the 14th International Symposium on Superalloys. editor / Sammy Tin ; Mark Hardy ; Justin Clews ; Jonathan Cormier ; Qiang Feng ; John Marcin ; Chris O'Brien ; Akane Suzuki. Springer Science and Business Media Deutschland GmbH, 2020. pp. 163-170 (Minerals, Metals and Materials Series).

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abstract = "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.",

keywords = "Discontinuous precipitation, Microstructural design, Polycrystalline superalloys",

author = "Satoru Kobayashi and Tomoki Otsuka and Rikuryo Watanabe and Kyosuke Sagitani and Masaki Okamoto and Kako Tokutomi",

note = "Funding Information: Acknowledgements This study is partially JSPS KAKENHI Grant Number JP18H01731. Publisher Copyright: {\textcopyright} 2020, The Minerals, Metals & Materials Society.; 14th International Symposium on Superalloys, Superalloys 2021 ; Conference date: 12-09-2021 Through 16-09-2021",

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AB - 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.

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

Abstract

Publication series

Conference

Keywords

ASJC Scopus subject areas

Access to Document

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