Effect of hot isostatic pressure on the microstructure and tensile properties of <b>γ</b>'-strengthened superalloy fabricated through induction-assisted directed energy deposition

Jianjun Xu; Hanlin Ding; Xin Lin; Feng Liu

doi:10.1007/s12613-023-2792-5

Volume 31 Issue 5

May 2024

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2024 > 31(5): 1089-1097

Jianjun Xu, Hanlin Ding, Xin Lin, and Feng Liu, Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 1089-1097. https://doi.org/10.1007/s12613-023-2792-5

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Jianjun Xu, Hanlin Ding, Xin Lin, and Feng Liu, Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition, Int. J. Miner. Metall. Mater., 31(2024), No. 5, pp. 1089-1097. https://doi.org/10.1007/s12613-023-2792-5

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Research Article

Effect of hot isostatic pressure on the microstructure and tensile properties of γ'-strengthened superalloy fabricated through induction-assisted directed energy deposition

+ Author Affiliations

Corresponding authors:
Xin Lin E-mail: xlin@nwpu.edu.cn

Feng Liu E-mail: liufeng@nwpu.edu.cn
Received: 19 July 2023; Revised: 13 October 2023; Accepted: 27 November 2023; Available online: 21 November 2023

Abstract

Abstract

The microstructure characteristics and strengthening mechanism of Inconel738LC (IN-738LC) alloy prepared by using induction-assisted directed energy deposition (IDED) were elucidated through the investigation of samples subjected to IDED under 1050°C preheating with and without hot isostatic pressing (HIP, 1190°C, 105 MPa, and 3 h). Results show that the as-deposited sample mainly consisted of epitaxial columnar crystals and inhomogeneously distributed γ' phases in interdendritic and dendritic core regions. After HIP, grain morphology changed negligibly, whereas the size of the γ' phase became increasingly even. After further heat treatment (HT, 1070°C, 2 h + 845°C, 24 h), the γ' phase in the as-deposited and HIPed samples presented a bimodal size distribution, whereas that in the as-deposited sample showed a size that remained uneven. The comparison of tensile properties revealed that the tensile strength and uniform elongation of the HIP + HTed sample increased by 5% and 46%, respectively, due to the synergistic deformation of bimodal γ' phases, especially large cubic γ' phases. Finally, the relationship between phase transformations and plastic deformations in the IDEDed sample was discussed on the basis of generalized stability theory in terms of the trade-off between thermodynamics and kinetics.
- directed energy deposition;
- Ni-based superalloys;
- high-temperature preheating;
- hot isostatic pressing;
- microstructure;
- tensile properties

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