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

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          Abstract

          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” (Ni 3Nb) and γ’ (Ni 3(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.

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          Effect of heat treatment on the microstructure and mechanical properties of Inconel 718 processed by selective laser melting

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            Effects of Selective Laser Melting additive manufacturing parameters of Inconel 718 on porosity, microstructure and mechanical properties

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              Delta phase precipitation in Inconel 718

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                13 October 2019
                October 2019
                : 12
                : 20
                : 3336
                Affiliations
                [1 ]School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China; ysj@ 123456my.swjtu.edu.cn (S.Y.); wy_swjtu@ 123456163.com (Y.W.); wangqx1981@ 123456163.com (Q.W.); cszhang@ 123456home.swjtu.edu.cn (C.Z.); cdz@ 123456swjtu.edu.cn (D.C.)
                [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 notes
                [* ]Correspondence: gdcui@ 123456swjtu.edu.cn ; Tel.: +86-136-8848-1468
                Author information
                https://orcid.org/0000-0003-3883-9170
                Article
                materials-12-03336
                10.3390/ma12203336
                6829393
                31614912
                a0cc0fd0-b746-4bf8-8ad6-428f6c185313
                © 2019 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 11 September 2019
                : 11 October 2019
                Categories
                Article

                inconel 718 superalloy,spark plasma sintering,nano-scale precipitation,microstructure,mechanical property

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