Effects of deposition sequence on microstructural evolution in additively manufactured Cu-Cr-Nb alloy / superalloy bimetallic structures

Iams, A. D.; Lienert, Thomas J.; Otazu, David A; Ramoni, Monsuru

doi:10.1016/j.addlet.2023.100151

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…The corresponding SAD pattern in Figure 4b is identified as belonging to a hexagonal closed packed (HCP) P63/mmc crystal structure [36]. This crystal structure was reported in Inconel 718 GRCop42 joints by Iams et al [37], and is commonly referred to as HCP C14 Laves or high temperature Cr 2 Nb [38,39]. STEM-EDS composition data in Table 3 shows that from 85 to 95 wt.% GRCop42, the HCP C14 Laves decreases in Ni content and increases in Nb content.…”

Section: -95 Wt% Grcop42 Cu-deprived Regionssupporting

confidence: 52%

Effect of Liquid Miscibility Gap on Defects in Inconel 625–GRCop42 Joints through Analysis of Gradient Composition Microstructure

Preis,

Xu,

Paul

et al. 2024

JMMP

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Joining of Cu-based dispersion-strengthened alloys to Ni-based superalloys has garnered increased attention for liquid rocket engine applications due to the high thermal conductivity of Cu-based alloys and high temperature tensile strength of Ni-based superalloys. However, such joints can suffer from cracking when joined via liquid state processes, leading to part failure. In this work, compositions of 15–95 wt.% GRCop42 are alloyed with Inconel 625 and characterized to better understand the root cause of cracking. Results indicate a lack of miscibility between Cu-deprived and Cu-rich liquids in compositions corresponding to 30–95 wt.% GRCop42. Two distinct morphologies are observed and explained by use of CALPHAD; Cu-deprived dendrites with Cu-rich interdendritic zones at 30–50 wt.% GRCop42 and Cu-deprived spheres surrounded by a Cu-rich matrix at 60–95 wt.% GRCop42. Phase analysis reveals brittle intermetallic phases precipitate in the 60–95 wt.% GRCop42 Cu-deprived region. Three cracking mechanisms are proposed herein that provide guidance on the avoidance of defects Ni-based superalloy to Cu-based dispersion strengthened alloy joints.

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Section: -95 Wt% Grcop42 Cu-deprived Regionssupporting

confidence: 52%

Effect of Liquid Miscibility Gap on Defects in Inconel 625–GRCop42 Joints through Analysis of Gradient Composition Microstructure

Preis,

Xu,

Paul

et al. 2024

JMMP

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Size effects and optimization during laser directed energy deposition on high thermal conductivity copper alloys

Zhang,

Gao,

Xiao

et al. 2024

Journal of Materials Research and Technology

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Heterogeneous interfaces of aluminum bronze/Inconel 718 dissimilar alloys under different wire arc directed energy deposition sequences

Chang,

Fang,

Zhou

et al. 2024

Int. J. Extrem. Manuf.

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The layer-by-layer deposition strategy of additive manufacturing makes it ideal to fabricate dissimilar alloy components with varying functionality, which has promising application potential in a large number of industrial areas. In this study, two components composed of ERCuAl-A2 aluminum bronze (CuAl9) and Inconel 718 nickel-based superalloy were fabricated with different deposition orders by wire-arc directed energy deposition (wire-arc DED). Subject to changes in heat input and thermophysical properties of substrate, the transition region of the deposited Cu-Ni component with the bottom half of CuAl9 and the top half of Inconel 718 is narrow and serrated with a laminated intermetallic compound layer due to the convection and rapid cooling in the molten pool, while the Ni-Cu component deposited in the opposite order exhibits a 2 mm gradient transition zone due to the multi-layer partial remelting, in which a large number of diverse precipitates were found as well as regional variations in grain size. Both two components show strong bonds and their tensile specimens tested along the vertical direction always fracture at the softer CuAl9 side. Excellent tensile properties along the horizontal direction were obtained for Cu-Ni (Ultimate tensile strength: 573 MPa, yield stress: 302 MPa, elongation: 22 %), while those of Ni-Cu are much lower due to the existence of the solidification cracks in the transition zone. The results from this study provide a reference for the additive manufacturing of Cu/Ni dissimilar alloy components, as well as their microstructure and mechanical properties control.

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Effects of deposition sequence on microstructural evolution in additively manufactured Cu-Cr-Nb alloy / superalloy bimetallic structures

Cited by 4 publications

References 25 publications

Effect of Liquid Miscibility Gap on Defects in Inconel 625–GRCop42 Joints through Analysis of Gradient Composition Microstructure

Effect of Liquid Miscibility Gap on Defects in Inconel 625–GRCop42 Joints through Analysis of Gradient Composition Microstructure

Size effects and optimization during laser directed energy deposition on high thermal conductivity copper alloys

Heterogeneous interfaces of aluminum bronze/Inconel 718 dissimilar alloys under different wire arc directed energy deposition sequences

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