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Article

Effects of the γ″-Ni3Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments

1
Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China
2
Mechanical and Electrical Engineering College, Nanchang University, Nanchang 330031, China
3
Beijing Institute of Near Space Vehicle System Engineering, Beijing 10000, China
4
AVIC Guizhou Anji Aviation Precision Casting Co., Ltd., Guizhou 561000, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(1), 151; https://doi.org/10.3390/ma13010151
Received: 21 November 2019 / Revised: 26 December 2019 / Accepted: 27 December 2019 / Published: 31 December 2019
The effects of the γ″-Ni3Nb phase on the mechanical properties of Inconel 718 superalloys, with standard heat treatment, hot isostatic pressing + solution treatment + aging, and hot isostatic pressing + direct aging, were characterized by morphological observation, X-ray diffraction, and tensile experiments. The results of the morphological observation revealed that many fine γ″ precipitates of ~26.49 ± 1.82 nm in mean size were formed in all samples. However, the relatively coarser γ″ precipitates formed in the grain boundaries were only observed in the sample treated with hot isostatic pressing + direct aging. The yield strengths of the hot isostatic pressing + direct aging sample at room temperature and at 650 °C both exhibited the maximum values about 993 ± 5.7 and 811 ± 12.6 MPa, respectively. The γ″ precipitate was considered to be the dominant strengthening phase in the sample according to the lattice misfits (ε) of γ/γ″. The strengthening mechanism of the samples can be explained as the coherency strain strengthening of fine γ″ precipitates. Moreover, due to the coarser γ″ precipitates in the grain boundaries, dislocation-cut ordered particle strengthening also occurred in the sample after hot isostatic pressing + direct aging treatment. View Full-Text
Keywords: γ″-Ni3Nb; mechanical properties; Inconel 718 superalloy; heat treatment; hot isostatic pressing γ″-Ni3Nb; mechanical properties; Inconel 718 superalloy; heat treatment; hot isostatic pressing
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MDPI and ACS Style

Ling, L.-S.-B.; Yin, Z.; Hu, Z.; Liang, J.-H.; Wang, Z.-Y.; Wang, J.; Sun, B.-D. Effects of the γ″-Ni3Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments. Materials 2020, 13, 151. https://doi.org/10.3390/ma13010151

AMA Style

Ling L-S-B, Yin Z, Hu Z, Liang J-H, Wang Z-Y, Wang J, Sun B-D. Effects of the γ″-Ni3Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments. Materials. 2020; 13(1):151. https://doi.org/10.3390/ma13010151

Chicago/Turabian Style

Ling, Li-Shi-Bao, Zheng Yin, Zhi Hu, Jin-Hui Liang, Zhi-Yong Wang, Jun Wang, and Bao-De Sun. 2020. "Effects of the γ″-Ni3Nb Phase on Mechanical Properties of Inconel 718 Superalloys with Different Heat Treatments" Materials 13, no. 1: 151. https://doi.org/10.3390/ma13010151

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