Primary Carbides in Alloy 718

Mitchell, A.

doi:10.1002/9781118495223.ch11

Cited by 6 publications

(2 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There could also be uncertainties in non-metallic inclusions in the wire. The thermochemistry of IN718 results in two types of inclusions, TiN and Al2O3, which not only influence the mechanical properties but also the solidification structure (Mitchell, 1989); the prior-existing TiN particles act as the principal nucleation sites for NbC (which is usually an undesired carbide according to (ASM International, 1990)) during solidification since they are isomorphous (Mitchell, 2010). Fig.…”

Section: Uncertainties From the Wirementioning

confidence: 99%

Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire + arc additive manufacture process

Ding

Ganguly

et al. 2019

Journal of Materials Processing Technology

131

View full text Add to dashboard Cite

This paper systematically evaluated the effect of oxide, wire source and heat treatment on the mechanical properties of wire + arc additively manufactured (WAAM) INCONEL 718. Comparison of the as deposited grain structure was made with laser-powder based AM and wrought INCONEL 718. Results showed that oxides formed during deposition had no effect on the mechanical properties since a 0.5μm thick passivation layer consisting of Cr2O3 and Al2O3 formed upon deposition and prevented further oxides from forming inside the bulk. Wires from different suppliers resulted in around 50 MPa difference in UTS possibly due to the slight compositional variation and uncertainties in TiN inclusion. Standard heat treatment improved the strength from 824 MPa to 1110 MPa in the horizontal direction, but the average strength was 105 MPa lower than the wrought alloy. The as deposited WAAM INCONEL718 featured large columnar grains and numerous Laves phase, as compared to the fine grains of laser powder bed fusion and wrought INCONEL 718. This starting microstructure led to less favourable and less numerous precipitates forming during heat treatment, which is the main reason for the strength mismatch. A different heat treatment would not help due to the starting microstructure.

show abstract

Section: Uncertainties From the Wirementioning

confidence: 99%

Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire + arc additive manufacture process

Ding

Ganguly

et al. 2019

Journal of Materials Processing Technology

131

View full text Add to dashboard Cite

show abstract

“…Laves phases take the form of A 2 B type (Ni,Cr,Fe) 2 (Nb,Mo,Ti) and can form due to variation in composition, processing and high-temperature exposure, formation of Laves is known to deplete Nb required for γ ″ formation [18,19]. Carbides formable in IN718 is primarily MC type (Nb,Ti)C, M 6 C can also form at the grain boundaries with longer exposure to temperature [20].…”

Section: Introductionmentioning

confidence: 99%

A performance comparison of additive manufactured creep-resistant superalloys

James

Ganguly

Pardal

2023

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

Creep-resistant nickel, cobalt based superalloys, selected for a high-speed flight application, deposited using Wire + Arc Additive Manufacturing (WAAM), was reported. Three different alloys, Haynes 188, Inconel 718, and Rene 41, were deposited, and tested for their hightemperature tensile properties, and the results compared with wrought data. The alloys were tested from ambient temperature to 1000°C in their as-deposited condition and after undergoing industry standard age-hardening and solutionising heat-treatments, to down select the best performing alloy under two different processing conditions. The mechanical strength of the alloys fell short of the maximum achievable in wrought condition. Precipitation-strengthened alloys, Inconel 718 and Rene 41 were found to have underperformed the most significantly, whereas solid-solution-strengthened Haynes 188 suffered the least due to WAAM.

show abstract

Microstructural Stability and Evolution in a New Polycrystalline Ni-Base Superalloy

Wise,

Church,

Talbot

et al. 2023

Metall Mater Trans A

View full text Add to dashboard Cite

Polycrystalline Ni-base superalloys that offer equivalent or superior performance to current commercial alloys at lower overall cost are of widespread industrial interest. In this work, a new polycrystalline Ni-base superalloy with low elemental cost has been characterized and compared to current commercially available alternatives. Through a combination of scanning electron microscopy, thermal analysis, synchrotron X-ray diffraction, and hardness testing, a broad preliminary investigation of fundamental alloy properties has been performed, identifying the key areas for further alloy development opportunities.

show abstract

Primary Carbides in Alloy 718

Cited by 6 publications

References 14 publications

Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire + arc additive manufacture process

Investigation of process factors affecting mechanical properties of INCONEL 718 superalloy in wire + arc additive manufacture process

A performance comparison of additive manufactured creep-resistant superalloys

Microstructural Stability and Evolution in a New Polycrystalline Ni-Base Superalloy

Contact Info

Product

Resources

About