Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations

Zhan Qiao; Chong Li; Hong-jun Zhang; Hong-yan Liang; Yong-chang Liu; Yong Zhang

doi:10.1007/s12613-019-1949-8

Volume 27 Issue 8

Aug. 2020

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2020 > 27(8): 1123-1132

Zhan Qiao, Chong Li, Hong-jun Zhang, Hong-yan Liang, Yong-chang Liu, and Yong Zhang, Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations, Int. J. Miner. Metall. Mater., 27(2020), No. 8, pp. 1123-1132. https://doi.org/10.1007/s12613-019-1949-8

Cite this article as:

Zhan Qiao, Chong Li, Hong-jun Zhang, Hong-yan Liang, Yong-chang Liu, and Yong Zhang, Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations, Int. J. Miner. Metall. Mater., 27(2020), No. 8, pp. 1123-1132. https://doi.org/10.1007/s12613-019-1949-8

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Research Article

Evaluation on elevated-temperature stability of modified 718-type alloys with varied phase configurations

+ Author Affiliations

Corresponding authors:
Chong Li    E-mail: lichongme@tju.edu.cn

Hong-jun Zhang    E-mail: zhanghongjunzg@163.com

Yong-chang Liu    E-mail: licmtju@163.com
Received: 17 October 2019; Revised: 1 December 2019; Accepted: 11 December 2019; Available online: 2 March 2020

Abstract

Abstract

Inconel 718 is a Ni–Fe-based superalloy widely used in aerospace engines because of its excellent mechanical properties. However, the inferior stability of the γ″ phase limits the application of Inconel 718, which coarsens rapidly at temperatures greater than 650°C. Further improving the temperature tolerance of Inconel 718 requires optimization of the phase configuration via modification of the alloy’s chemical composition. Given the aforementioned objective, this work was conducted to study the precipitation behavior and thermal stability of the strengthening phases with various structures in modified Inconel 718 alloys by tailoring the Al/Ti ratio. With increasing Al/Ti ratio, three particle configurations were formed: γ′/γ″ composite, isolated γ′, and γ′/γ″/γ′ composite particles. The results of aging tests demonstrate that the isolated γ′ and the γ′/γ″/γ′ composite structure exhibited better thermal stability at temperature as high as 800°C. The isolated γ′ exhibited a reduced coarsening rate compared with the γ′/γ″/γ′ composite particles because the isolated γ′ phase was rich in Al, Ti, and Nb. However, the γ′/γ″ composite particles coarsened and decomposed rapidly during aging at temperatures greater than 700°C because of the lower stability resulting from the larger number of γ″ particles. The obtained results provide necessary data for the compositional optimization of novel 718-type alloys.
- Inconel 718;
- structure;
- thermal stability;
- interface

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