High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices

Hyeji Park; Chunan Li; Adam E. Jakus; Ramille N. Shah; Heeman Choe; David C. Dunand

doi:10.1016/j.scriptamat.2020.07.009

High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices

Hyeji Park, Chunan Li, Adam E. Jakus, Ramille N. Shah, Heeman Choe, David C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H₂-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750 °C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al₂O₃ surface layer. However, the resulting Al depletion within the struts reduces creep resistance at 850 °C, which nevertheless remains similar to Ni-based superalloy foam, with 35% relative density.

Original language	English (US)
Pages (from-to)	146-150
Number of pages	5
Journal	Scripta Materialia
Volume	188
DOIs	https://doi.org/10.1016/j.scriptamat.2020.07.009
State	Published - Nov 2020

Keywords

3D-printing
Co-based superalloy
High-temperature characterization
Mechanical property
Microlattice architecture

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2020.07.009

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title = "High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices",

abstract = "Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H2-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750 °C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al2O3 surface layer. However, the resulting Al depletion within the struts reduces creep resistance at 850 °C, which nevertheless remains similar to Ni-based superalloy foam, with 35% relative density.",

keywords = "3D-printing, Co-based superalloy, High-temperature characterization, Mechanical property, Microlattice architecture",

author = "Hyeji Park and Chunan Li and Jakus, {Adam E.} and Shah, {Ramille N.} and Heeman Choe and Dunand, {David C.}",

note = "Funding Information: This study was supported by the U.S. Department of Commerce, National Institute of Standards and Technology, as part of the Center for Hierarchical Materials Design (CHiMaD) at Northwestern University via award 70NANB14H012. HC also acknowledges support from the Korea Electric Power Corporation (Grant No.: R18XA06-41). Publisher Copyright: {\textcopyright} 2020",

year = "2020",

month = nov,

doi = "10.1016/j.scriptamat.2020.07.009",

language = "English (US)",

volume = "188",

pages = "146--150",

journal = "Scripta Materialia",

issn = "1359-6462",

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T1 - High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices

AU - Park, Hyeji

AU - Li, Chunan

AU - Jakus, Adam E.

AU - Shah, Ramille N.

AU - Choe, Heeman

AU - Dunand, David C.

N1 - Funding Information: This study was supported by the U.S. Department of Commerce, National Institute of Standards and Technology, as part of the Center for Hierarchical Materials Design (CHiMaD) at Northwestern University via award 70NANB14H012. HC also acknowledges support from the Korea Electric Power Corporation (Grant No.: R18XA06-41). Publisher Copyright: © 2020

PY - 2020/11

Y1 - 2020/11

N2 - Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H2-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750 °C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al2O3 surface layer. However, the resulting Al depletion within the struts reduces creep resistance at 850 °C, which nevertheless remains similar to Ni-based superalloy foam, with 35% relative density.

AB - Cobalt-based superalloy microlattices were created via (i) three-dimensional-extrusion printing of inks containing a suspension of Co-, Ni- and W-oxide particles, (ii) H2-reduction of the oxides and sintering to a homogenous Co-Ni-W alloy, (iii) Al pack-cementation to deposit Al on the microlattice struts, followed by Al-homogenization. The resulting Co-(18–20)Ni-(5–6)W-(10–13)Al (at.%) microlattices, with 27–30% relative density and 350 μm diameter struts, display a peak in yield strength at 750 °C, consistent with their γ/γ′ aged microstructure. Oxidation resistance is strongly improved compared to Al-free printed Co-Ni-W lattices, via the formation of an Al2O3 surface layer. However, the resulting Al depletion within the struts reduces creep resistance at 850 °C, which nevertheless remains similar to Ni-based superalloy foam, with 35% relative density.

KW - 3D-printing

KW - Co-based superalloy

KW - High-temperature characterization

KW - Mechanical property

KW - Microlattice architecture

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ER -

High-temperature mechanical properties of γ/γ′ Co–Ni–W–Al superalloy microlattices

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