Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Li, LV; Gong, Xiaochun; Ye, Xianjue; Teng, Jianwei; Nie, Yan; Li, Yunping; Lei, Qian

doi:10.3390/ma11122549

Cited by 21 publications

(10 citation statements)

References 29 publications

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“…As a precipitation strengthening alloy, the Inconel 718 (IN718) alloy has been widely used in the aircraft industry due to its good corrosion resistance and excellent mechanical properties at elevated temperatures [1,2,3]. IN718 is strengthened mainly by the nano-scale γ” (Ni 3 Nb) and γ’ (Ni 3 (Al, Ti)) phases.…”

Section: Introductionmentioning

confidence: 99%

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

Yan

Wang

et al. 2019

Materials

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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.

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Section: Introductionmentioning

confidence: 99%

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

Yan

Wang

et al. 2019

Materials

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“…Standard XRD can be obtained with laboratory-based diffractometers. Many studies have used crystallographic information gained from XRD to confirm PBF's tendency to form textures oriented in the build direction [97,159,163,226,275]. It can also be used to compare the impact of the processing technique on the resulting texture as shown in a study by Amato et al [161].…”

Section: X-ray and Neutron Diffractionmentioning

confidence: 99%

Powder bed fusion additive manufacturing of Ni-based superalloys: a review of the main microstructural constituents and characterization techniques

et al. 2022

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Metal additive manufacturing (AM) has unlocked unique opportunities for making complex Ni-based superalloy parts with reduced material waste, development costs, and production lead times. Considering the available AM methods, powder bed fusion (PBF) processes, using either laser or electron beams as high energy sources, have the potential to print complex geometries with a high level of microstructural control. PBF is highly suited for the development of next generation components for the defense, aerospace, and automotive industries. A better understanding of the as-built microstructure evolution during PBF of Ni-based superalloys is important to both industry and academia because of its impacts on mechanical, corrosion, and other technological properties, and, because it determines post-processing heat treatment requirements. The primary focus of this review is to outline the individual phase formations and morphologies in Ni-based superalloys, and their correlation to PBF printing parameters. Given the hierarchal nature of the microstructures formed during PBF, detailed descriptions of the evolution of each microstructural constituent are required to enable microstructure control. Ni-based superalloys microstructures commonly include γ, γ′, γ′′, $$\delta$$ δ , TCP, carbides, nitrides, oxides, and borides, dependent on their composition. A thorough characterization of these phases remains challenging due to the multi-scale microstructural hierarchy alongside with experimental challenges related to imaging secondary phases that are often nanoscale and (semi)-coherent. Hence, a detailed discussion of advanced characterization techniques is the second focus of this review, to enable a more complete understanding of the microstructural evolution in Ni-based superalloys printed using PBF. This is with an expressed goal of directing the research community toward the tools necessary for a thorough investigation of the processing-microstructure-property relationships in PBF Ni-based superalloy parts to enable microstructural engineering.

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“…26 For example, it has been shown for standard manufacturing processes that the texturing of alloys influences the number of special grain boundaries, and that these are much more resistant to intergranular oxidation. 27,28 In particular, R3 grain boundaries have better resistance to intergranular oxidation. Sanviemvongsak et al 4 studied the link between the nature of grain boundaries resulting from additive manufacturing and the kinetics of intergranular oxidation.…”

Section: Effect Of Microstructure and Chemical Homogeneitymentioning

confidence: 99%

“…This influences the oxidation. For example, Li et al 28 seem to show during preliminary results on an alloy 718 produced by EBM, that the fabrication angle affects the orientation of the grains and the density of grain boundaries, which would have a slight repercussion on the resistance to oxidation at high temperature. Finally, the fineness of some AM structures can make them susceptible to premature exhaustion of alloying elements that protect against oxidation or corrosion at high temperature.…”

Section: Effect Of Complex Geometries and Thin Wallsmentioning

confidence: 99%

High Temperature Oxidation of Additively Manufactured Structural Alloys

Monceau

Vilasi

2022

JOM

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Metal alloys produced by additive manufacturing have specifi c microstruc tures and compositions. Their microstructure is generally out of equilibrium, textured, and inhomogeneities can be observed. They can have pores and nano-inclusions. The contents of volatile elements may deviate from the nominal composition. These alloys often experience signifi cant interna! stresses and present fairly rough surfaces depending on the process used. Hipping these alloys modifies their microstructure and defects. This literature review shows that open porosity can lead to much higher oxidation kinetics than dense materials, with very deep interna! oxide penetrations. Neverthe less, when fabricated with optimized parameters, LBM-or EBM-alloys, such as TA6V, 718, or 316L, can behave as well as, or even better than, wrought alloys. The roughness of the surface is not necessarily problematic, but it can lead to local breakaway phenomena and premature spalling on some alloys. It has been verifi ed that the nature of the grain boundaries strongly affects the intergranular oxidation. The effect of chemical segregations on the protective nature of the outer oxide layer has also been reported. Today, too few studies have been devoted to the effect of raw and pre-oxidized surface states after HIP on cyclic oxidation and on hot corrosion of these alloys.

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Influence of Building Direction on the Oxidation Behavior of Inconel 718 Alloy Fabricated by Additive Manufacture of Electron Beam Melting

Cited by 21 publications

References 29 publications

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

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

Powder bed fusion additive manufacturing of Ni-based superalloys: a review of the main microstructural constituents and characterization techniques

High Temperature Oxidation of Additively Manufactured Structural Alloys

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