Phase analysis of sintered and heat treated alloy 718

Hajmrle, K.; Angers, R.; Dufour, G.

doi:10.1007/bf02642410

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…The precipitates were found to have high niobium and titanium concentrations compared to the matrix. By comparison with similar results found in the literature, the second phases were identified as secondary MC carbides (M¼Nb,Ti) [22][23][24][25][26]. The presence of these second phase particles at grain boundaries during sintering can slow down and stop grain growth due to the Zener pinning effect.…”

Section: Microstructure Evolutionmentioning

confidence: 54%

Pressureless sintering of cold sprayed Inconel 718 deposit

Levasseur

Yue

Brochu

2012

Materials Science and Engineering: A

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Section: Microstructure Evolutionmentioning

confidence: 54%

Pressureless sintering of cold sprayed Inconel 718 deposit

Levasseur

Yue

Brochu

2012

Materials Science and Engineering: A

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“…Peak deconvolution based on isotopic abundances gives a reduction in the Cr content by 3 at% in comparison with the original powder composition measured by the supplier (given in Table 1). The decrease in Cr is due to evaporation during sintering in vacuum that has been observed in [39]. Additionally, the MF 3 processing history leads to an increased amount of oxides, whereas the content of solute C is close to zero despite using an organic binder during shaping.…”

Section: Sintered and Aged Microstructurementioning

confidence: 77%

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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“…Elements (x-axis) that carbothermally reduce within this range, such as the primary constituents of our alloy, Ni, Co, and Cu, will offgas CO or CO2 in a temperature range where it can become trapped and prevent full sintering [50,51] .…”

Section: Alloy Design For Rapid Sinteringmentioning

confidence: 99%

“…This metric permits quantitative comparisons of disparate materials and thermal cycles, as shown in Fig. 4c, where we see that the thermal budget for the designed Ni alloy (black) is reduced by at least two orders of magnitude as compared to its commercial Nibased powder alloy counterparts, as well as elemental Ni and Cu powders 13,[43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] . What is more, for most of these commercial Ni-base alloys, densification is too slow in the solid state (solid data points), so some degree of melting is required for densification; the open data points show that high density typically requires melting in those alloys.…”

Section: Experimental Validation Of the Accelerated Sintering Designmentioning

confidence: 99%

Multicomponent alloys designed to sinter

Naunheim,

Schuh

2024

Preprint

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Powder sintering is a low-energy, net-shape processing route for many new products in the additive manufacturing space. We advance the viewpoint that for future manufacturing, alloys should be designed from materials science principles to sinter quickly at lower temperatures and with controlled final microstructures. Specifically, we illustrate the computational design of a multinary Ni-base alloy, whose chemistry permits a low-temperature solid-state sintering scheme without any pressure- or field-assistance, as well as heat-treatability after sintering. The strategy is based on sequential phase evolutions designed to occur during sintering. The reactions involve rapid reorganization of matter to full density in cycles up to just 1200°C, while conventional Ni alloys sintered in the solid-state require about ten times longer, or more than 250°C degrees higher temperature. Our approach yields an alloy that benefits from precipitation hardening, has an increased strength ~ 50% higher than solid-state processed commercial Ni alloys, and yet exhibits extensive plasticity beyond 35% uniaxial strain. The results point to a generalizable design scheme for many other alloys designed for solid-state powder processing that can enable greater value from additive manufacturing.

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Phase analysis of sintered and heat treated alloy 718

Cited by 9 publications

References 2 publications

Pressureless sintering of cold sprayed Inconel 718 deposit

Pressureless sintering of cold sprayed Inconel 718 deposit

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

Multicomponent alloys designed to sinter

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