Effect of two-step solid solution on microstructure and <b>δ</b> phase precipitation of Inconel 718 alloy

Enyu Liu; Qingshuang Ma; Xintong Li; Aoxue Gao; Jing Bai; Liming Yu; Qiuzhi Gao; Huijun Li

doi:10.1007/s12613-024-2887-7

Volume 31 Issue 10

Oct. 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(10): 2199-2207

Enyu Liu, Qingshuang Ma, Xintong Li, Aoxue Gao, Jing Bai, Liming Yu, Qiuzhi Gao, and Huijun Li, Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2199-2207. https://doi.org/10.1007/s12613-024-2887-7

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Enyu Liu, Qingshuang Ma, Xintong Li, Aoxue Gao, Jing Bai, Liming Yu, Qiuzhi Gao, and Huijun Li, Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy, Int. J. Miner. Metall. Mater., 31(2024), No. 10, pp. 2199-2207. https://doi.org/10.1007/s12613-024-2887-7

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Research Article

Effect of two-step solid solution on microstructure and δ phase precipitation of Inconel 718 alloy

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Corresponding authors:
Qiuzhi Gao E-mail: neuqgao@163.com

Huijun Li E-mail: huijun@uow.edu.au
Received: 23 January 2024; Revised: 6 March 2024; Accepted: 20 March 2024; Available online: 21 March 2024

Abstract

Abstract

Inconel 718 is the most popular nickel-based superalloy and is extensively used in aerospace, automotive, and energy industries owing to its extraordinary thermomechanical properties. The effects of different two-step solid solution treatments on microstructure and δ phase precipitation of Inconel 718 alloy were studied, and the transformation mechanism from γ″ metastable phase to δ phase was clarified. The precipitates were statistically analyzed by X-ray diffractometry. The results show that the δ phase content firstly increased, and then decreased with the temperature of the second-step solid solution. The changes in microstructure and δ phase were studied by scanning electron microscopy and transmission electron microscopy. An intragranular δ phase formed in Inconel 718 alloy at the second-step solid solution temperature of 925°C, and its orientation relationship with γ matrix was determined as ${[\bar 100]_{\text δ} }$//${[01\bar 1]_{\text γ} }$ and (010)_δ//(111)_γ. Furthermore, the Vickers hardness of different heat treatment samples was measured, and the sample treated by second-step solid solution at 1010°C reached the maximum hardness of HV 446.84.
- Inconel 718 alloy;
- two-step solid solution treatment;
- δ phase;
- γ″–δ transformation

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