Inconel 718 treated with two-stage solution and aging processes: microstructure evolution and enhanced properties

An, Xulong; Zhou, Lanzhang; Zhang, B; Chu, Chenglin; Li, Han; Chu, Paul K.

doi:10.1088/2053-1591/ab1290

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…According to the supplier, the alloy was first melted in a vacuum induction furnace (968 °C). Subsequently, the allow was subjected to forging to give the bar shape and then subjected to solution seat treatment to precipitation-harden the substance [ 22 ]. Hence, it is termed as ‘cast alloy’ in the rest of the manuscript to distinguish it from the L-PBF alloy.…”

Section: Methodsmentioning

confidence: 99%

Investigation into the Microstructure and Hardness of Additively Manufactured (3D-Printed) Inconel 718 Alloy

et al. 2023

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Additive manufacturing (AM) of Ni-based super alloys is more challenging, compared to the production other metallic alloys. This is due to their high melting point and excellent high temperature resistance. In the present work, an Inconel 718 alloy was fabricated by a powder laser bed fusion (P-LBF) process and investigated to assess its microstructural evolution, together with mechanical properties. Additionally, the alloy was compared against the cast (and forged) alloy of similar composition. The microstructure of the P-LBF-processed alloy shows hierarchy microstructure that consists of cellular sub-structure (~100–600 nm), together with melt pool and grain boundaries, in contrast of the twin infested larger grain microstructure of the cast alloy. However, the effect of such unique microstructure on mechanical properties of the L-PBF alloy was overwritten, due to the absence of precipitates. The hardness of the L-PBF-processed alloy (330–349 MPa) was lower than that of cast alloy (408 MPa). The similar trend was also observed in other mechanical properties, such as Young’s modulus, resistance to plasticity and shear stress.

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Section: Methodsmentioning

confidence: 99%

Investigation into the Microstructure and Hardness of Additively Manufactured (3D-Printed) Inconel 718 Alloy

et al. 2023

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“…5,6 The sweet wells are mildly corrosive to Ni-based alloys due to the passive lm on the alloy surfaces, which governs the localised corrosion resistance during service in the environments. For these reasons, the precipitation-hardened UNS N07718 alloy provides the desired mechanical properties 7,8 and localised corrosion resistance in sour environments. 4 Understanding the electrochemical properties of the passive lm formed on the surface of the alloy exposed to corrosive environments is necessary, because the localised corrosion resistance of the UNS N07718 alloy is strongly related to these properties.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 The sweet wells are mildly corrosive to Ni-based alloys due to the passive film on the alloy surfaces, which governs the localised corrosion resistance during service in the environments. For these reasons, the precipitation-hardened UNS N07718 alloy provides the desired mechanical properties 7,8 and localised corrosion resistance in sour environments. 4…”

Section: Introductionmentioning

confidence: 99%

Passivation of precipitation-hardened UNS N07718 in a shallow sour aqueous solution

Lee

Kwon³

et al. 2023

RSC Adv.

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“…Heat treatment after sintering is applied for adjusting the resulting microstructure and enhancing mechanical properties. Knowledge acquired from investigations on MIM IN 718 [5][6][7][8][9][10][11][12][15][16][17] can be applied for optimization of sintering parameters for MF 3 processing.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

“…Heat-treated IN 718 is strengthened by finely dispersed γ″ (Ni 3 Nb) and γ′ (Ni 3 (Al, Ti)) intermetallic precipitates. The applied heat treatment consists of solution annealing followed by aging [ 6 ], which is adopted from existing cast and wrought material specifications. After heat treatment of sintered MIM IN 718, yield and tensile strength are increased and similar to cast material [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Metal fused filament fabrication of the nickel-base superalloy IN 718

et al. 2022

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This study demonstrates metal fused filament fabrication (MF3) as an alternative additive and highly flexible manufacturing method for free-form fabrication of high-performance alloys. This novel processing, which is similar to Metal injection molding (MIM), enables a significant reduction in manufacturing costs for complex geometries, since expensive machining can be avoided. Utilizing existing equipment and reducing material expense, MF3 can pave the way for new and low-cost applications of IN 718, which were previously limited by high manufacturing costs. Iterative process optimization is used to find the most suitable MF3 process parameters. High relative density above 97% after pressureless sintering can be achieved if temperature profiles and atmospheres are well adjusted for thermal debinding and sintering. In this study, the influence of processing parameters on the resulting microstructure of MF3 IN 718 is investigated. Samples sintered in vacuum show coarse-grained microstructure with an area fraction of 0.36% NbC at grain boundaries. Morphology and composition of formed precipitates are analyzed using transmission electron microscopy and atom probe tomography. The γ/γ″/γ′ phases’ characteristics for IN 718 were identified. Conventional heat treatment is applied for further tailoring of mechanical properties like hardness, toughness and creep behavior. Fabricated samples achieve mechanical properties similar to MIM IN 718 presented in literature. Graphical abstract

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Inconel 718 treated with two-stage solution and aging processes: microstructure evolution and enhanced properties

Cited by 8 publications

References 34 publications

Investigation into the Microstructure and Hardness of Additively Manufactured (3D-Printed) Inconel 718 Alloy

Investigation into the Microstructure and Hardness of Additively Manufactured (3D-Printed) Inconel 718 Alloy

Passivation of precipitation-hardened UNS N07718 in a shallow sour aqueous solution

Metal fused filament fabrication of the nickel-base superalloy IN 718

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