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Article

Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

1
School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
2
Sino-Euro Materials Technologies of Xi’an Co., Ltd., Xi’an 710018, China
3
Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Chengdu 610031, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3336; https://doi.org/10.3390/ma12203336
Received: 11 September 2019 / Revised: 10 October 2019 / Accepted: 11 October 2019 / Published: 13 October 2019
The present study aimed to optimize the phase constituents and mechanical properties of the spark plasma sintered (SPS) Inconel 718 (IN718) alloy. A series of heat treatment routes were designed based on the phase relations in IN718 and performed for the optimization. The microstructure and phase compositions of the SPS IN718 alloys were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy disperse spectroscopy (EDS), and transmission electron microscopy (TEM). The mechanical properties of the samples were characterized at room temperature and at 650 °C. The results showed that large amounts of γ” (Ni3Nb) and γ’ (Ni3(Al, Ti)) strengthening phases precipitated in the IN718 alloy after direct aging (DA) of the as-fabricated sample. Moreover, the mechanical properties of the DA sample were comparable to that of the best one of the solution-treated and aged counterparts. The analysis showed that the rapid sintering and solid solution treatment of the IN718 alloy were achieved simultaneously by SPS. In the case of the SPS IN718 material, the direct aging regime had the same heat treatment effect as the conventional solid solution and aging treatment. This contributes toward improving the production efficiency and reduces manufacturing costs in the actual production process. View Full-Text
Keywords: Inconel 718 superalloy; spark plasma sintering; nano-scale precipitation; microstructure; mechanical property Inconel 718 superalloy; spark plasma sintering; nano-scale precipitation; microstructure; mechanical property
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MDPI and ACS Style

Yan, S.; Wang, Y.; Wang, Q.; Zhang, C.; Chen, D.; Cui, G. Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations. Materials 2019, 12, 3336. https://doi.org/10.3390/ma12203336

AMA Style

Yan S, Wang Y, Wang Q, Zhang C, Chen D, Cui G. Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations. Materials. 2019; 12(20):3336. https://doi.org/10.3390/ma12203336

Chicago/Turabian Style

Yan, Shuaijiang, Yun Wang, Qingxiang Wang, Chengsong Zhang, Dazhi Chen, and Guodong Cui. 2019. "Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations" Materials 12, no. 20: 3336. https://doi.org/10.3390/ma12203336

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