Effect of Minor Elements on Microstructure and Mechanical Properties of In 718 Alloy

Guo, Song; Sun, Wei; Lu, Dehong; Hu, Zhangli

doi:10.7449/1997/superalloys_1997_521_530

Cited by 11 publications

(6 citation statements)

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“…The effect of the individual elements could not be separated but the Laves phase was enriched in Si compared with the matrix whereas it was depleted in Fe, suggesting that Si has a direct influence on TCP phase formation whereas the effect of Fe, if present, is indirect. An increase in Si content has also been shown by others to promote Laves phase formation 57 and to result in its enrichment in the precipitates. 57,58 Recent work on Laves phase in steels by Isik et al 59,60 has also shown Si enrichment in Laves precipitates.…”

Section: Effect Of Individual Elementsmentioning

confidence: 74%

“…An increase in Si content has also been shown by others to promote Laves phase formation 57 and to result in its enrichment in the precipitates. 57,58 Recent work on Laves phase in steels by Isik et al 59,60 has also shown Si enrichment in Laves precipitates. In addition, precipitation of Laves phase adjacent to M 23 C 6 precipitates due to local enrichment of Si and P was seen.…”

Section: Effect Of Individual Elementsmentioning

confidence: 74%

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Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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The formation of topologically close-packed (TCP) phases in nickel-base superalloys is an issue of increasing importance as alloys are designed with higher refractory element contents to meet the requirements of next generation turbine engines. This review considers the factors that affect an alloy's susceptibility to TCP formation. In particular, the debate surrounding the effect of certain individual elements, such as Co and Re, in promoting or suppressing TCP formation is examined alongside the various mechanisms that have been proposed to account for this behaviour. In addition, the detrimental effects of these phases on the alloy's mechanical properties are discussed, including crack initiation at precipitates, depletion of solid solution strengthening refractory elements and the effect on γ/γʹ rafting behaviour.

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Section: Effect Of Individual Elementsmentioning

confidence: 74%

Section: Effect Of Individual Elementsmentioning

confidence: 74%

Formation and effect of topologically close-packed phases in nickel-base superalloys

Wilson

2017

Materials Science and Technology

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“…The extruded sample has been homogenised and during the latter process, the Si from the laves phase dissolved in the matrix of the alloy accounting for the higher Si content. However, this difference is unlikely to affect the mechanical properties [ 36 ].…”

Section: Resultsmentioning

confidence: 99%

Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities

Wood

Díaz-Álvarez

et al. 2020

Materials

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Products produced by additive manufacturing (AM) seek to exploit net shape manufacturing by eliminating or minimizing post-process stages such as machining. However, many applications which include turbo machinery components with tight dimensional tolerances and a smooth surface finish will require at least a light machine finishing stage. This paper investigates the machinability of the additively fabricated INCONEL718 (IN718) alloy produced by laser melting powder bed fusion (LM-PBF) with different levels of spherical porosity in the microstructure. The literature suggests that the band width for laser energy density, which combines the various scan process parameters to obtain a low spherical type porosity in the LM-PBF IN718 alloy (~1%), has wide breadth. With the increasing laser energy density and above a threshold, there is a rapid increase in the spherical pore size. In this paper, three tube samples each with different levels of spherical porosity were fabricated by varying the laser energy density for LM-PBF of the IN718 alloy within the stable and higher energy density range and the porosity measured. A low laser energy density was avoided due to balling up, which promotes highly irregular lack of fusion defects and poor consolidation within the alloy microstructure. An orthogonal turning test instrumented, with a three-component dynamometer to measure the cutting forces, was performed on AM produced IN718 tube samples under light cut conditions to simulate a finish machining process. The orthogonal turning tests were also performed on a tube sample obtained from the wrought extruded stock. The machining process parameters, which were studied include varying the cutting speed at three levels, at a fixed feed and under dry cut conditions for a short duration to avoid the tool wear. The results obtained were discussed and a notable finding was the higher rate of built-up-edge formation on the tool tip from the AM samples with a higher porosity and especially at a higher cutting speed. The paper also discusses the mechanisms that underpin the findings.

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“…The ideal can even be less than 5ppm. Minor Elements Control Besides controlling harmful elements, a series of studies on optimizing minor elements such as P, B, Zr, and Mg have also been carried out in China to improve the performances of superalloys [4][5][6][7][8][9][10]. One of the significant efforts involved is optimization of phosphorus in GH4169, whose content had always been controlled under 50ppm, and once been pursued to the "ultra-low" level as it was initially considered harmful to the alloy.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress of Manufacturing Technologies on C&W Superalloys in China

Du¹,

Zhao²,

Chen³

et al. 2014

8th International Symposium on Superalloy 718 and Derivatives (2014)

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Effect of Minor Elements on Microstructure and Mechanical Properties of In 718 Alloy

Cited by 11 publications

References 0 publications

Formation and effect of topologically close-packed phases in nickel-base superalloys

Formation and effect of topologically close-packed phases in nickel-base superalloys

Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities

Recent Progress of Manufacturing Technologies on C&W Superalloys in China

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