Effects of laser modes on Nb segregation and Laves phase formation during laser additive manufacturing of nickel-based superalloy

Xiao, Hui; Li, S.M.; Xiao, Wenjia; Li, Y.Q.; Cha, Limei; Mazumder, J.; Song, Lijun

doi:10.1016/j.matlet.2016.10.118

Cited by 125 publications

(44 citation statements)

References 8 publications

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“…Contrary to what was observed in the asbuilt EBM material, Kuo et al [36] found that δ phases were present in LBM materials only after the AMS 5662 heat treatment. Besides, during LBM process solidification, high cooling rate results in Nb segregation [37,38], and therefore the formation of long brittle Laves phases. However, no Laves phase was reported in 718 alloys produced by EBM process [26].…”

Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

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A B S T R A C TThe oxidation behaviour of IN 718 alloys produced by laser beam melting and electron beam melting was compared to that of the wrought alloy at 850°C in laboratory air. Oxide scales of all alloys were similar in nature and morphology with small differences due to powder particles sintered on the surface of additive manufacturing parts. Nevertheless, major differences in surface topography were noticed, these could affect surface area estimations and consequentlymass gain estimations. A quantitative correlation was determined between apparent parabolic rate constant and surface area.

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Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

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“…Figure 5d-h, this precipitate is enrichment of Nb and Mo, and depletion of Fe, Cr, and Ni. According to References [18][19][20][21], the precipitate can be confirmed as the Laves phase, which is generally accepted to be the form of (Fe,Ni,Cr) 2 (Nb,Mo,Ti). It is a eutectic with the matrix.…”

Section: First Dendrite Arm Spacementioning

confidence: 99%

Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

Cao

Bai

Liu

et al. 2019

Metals

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The microstructure and precipitates of INCONEL 718 alloy (IN718) fabricated by selective laser melting (SLM) are investigated. The matrix is comprised of the elongated γ grains along Z direction, tilting a few degrees. The microstructure mainly consists of a cellular–columnar structure with fine first dendrite arm space of 1–1.5 µm originated from the rapid solidification rate locally. The precipitates of the SLMed IN718 are confirmed to be a significant amount of Laves in the form of irregular bulk distribution, small amount of carbonitride and spherical Al2O3 particles in nanoscale. Some of the carbonitrides grow separately and some of the carbonitrides enwrap the Al2O3 fully or partly, forming the shell structure of the Al2O3–carbonitride. The reheating effect from the following layers to the previous layers have not reached the solid-state transformation temperature of the γ′ and γ″.

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“…The dendritic crystallization was composed of solid solution of γ phase 12 . Moreover, it can be found that some small precipitates, Laves phase ((Ni, Fe, Cr) 2 (Nb, Mo, Ti)), existed among these dendritic crystallizations 13 . However, when the solid solution + double ageing process were used, the microstructure experienced an obvious change (see Fig.…”

Section: Microstructuresmentioning

confidence: 99%

Effect of Solid Solution + Double Ageing on Microstructure and Properties in the Layer by Layer of the Z-Y Interface of Inconel 718 alloys Fabricated by SLM

Liu

Sun

et al. 2018

Mat. Res.

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The microstructure in the Z-Y surface of Inconel 718 alloys fabricated by selective laser melting (SLM) shows the relatively homogeneous and irregular fine grain structure after the heat treatment process of 1050ºC solid solution + double ageing. A large number of bulk precipitates were observed on the grain boundary, and the typical dendritic crystallization and Laves phases disappeared. It is possible that a large number of δ phases (NbNi 3) were precipitated on the grain boundary since the enrichment effect of element Nb. The hardness in the Z-Y surface increased from 350HV to 500HV, and the residual stress was transformed from the tensile stress to compressive stress.

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Effects of laser modes on Nb segregation and Laves phase formation during laser additive manufacturing of nickel-based superalloy

Cited by 125 publications

References 8 publications

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

Investigation on the Precipitates of IN718 Alloy Fabricated by Selective Laser Melting

Effect of Solid Solution + Double Ageing on Microstructure and Properties in the Layer by Layer of the Z-Y Interface of Inconel 718 alloys Fabricated by SLM

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