Microstructure and compressive properties of 3D-extrusion-printed, aluminized cobalt-based superalloy microlattices

Hyeji Park; Heeman Choe; David C. Dunand

doi:10.1016/j.msea.2021.141262

Microstructure and compressive properties of 3D-extrusion-printed, aluminized cobalt-based superalloy microlattices

Hyeji Park, Heeman Choe, David C. Dunand^*

^*Corresponding author for this work

Materials Science and Engineering

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

6 Scopus citations

Abstract

Cobalt-based superalloy microlattices with γ/γ′ microstructure are manufactured by combining two additive methods: ink-extrusion 3D-printing and pack-cementation surface alloying. First, a microlattice green structure is 3D-printed at ambient temperature from inks comprised of Co₃O₄, NiO, and WO₃ powders, an elastomeric binder and solvents. Organic removal followed by oxide reduction under Ar-5% H₂, sintering and homogenization at 1250 °C lead to a metallic microlattice with dense struts with uniform γ (fcc)-Co–22Ni–8W (at.%) composition. Second, aluminum is deposited on the strut surfaces via pack-cementation at 1000 °C, diffused at 1300 °C through the strut volume to achieve a uniform composition (Co–20Ni–6W–10Al or Co–18Ni–5W–13Al, at.%), and precipitated during aging at 900 °C as γ′ precipitates within the γ matrix. The compressive strength, ductility and energy absorption of these γ/γ′ Co-based precipitation-strengthened microlattices is measured at ambient temperatures for two aging time (16 and 65 h) and found to be much superior to those of an unalloyed Co microlattice.

Original language	English (US)
Article number	141262
Journal	Materials Science and Engineering: A
Volume	815
DOIs	https://doi.org/10.1016/j.msea.2021.141262
State	Published - May 20 2021

Funding

This study was supported by the U.S. Department of Commerce , National Institute of Standards and Technology ( NIST ), as part of the Center for Hierarchical Materials Design ( CHiMaD ) at Northwestern University ( NU ) via award 70NANB14H012 . HP acknowledges support from the Basic Science Research Program ( 2019R1I1A1A01058247 ; 2018R1D1A1B07048390 ) through the National Research Foundation of Korea ( NRF ). The authors thank Dr. C.E. Campbell (NIST) for useful discussions concerning the Co–Ni–W phase diagram, and Prof. Ramille N. Shah and Dr. Adam E. Jakus for providing equipment and training on the ink fabrication and printing of the samples used in the work, and numerous useful discussions.

Keywords

3D-printing
Co-based superalloy
High-temperature application
Microlattice architecture
Pack-cementation

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2021.141262

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title = "Microstructure and compressive properties of 3D-extrusion-printed, aluminized cobalt-based superalloy microlattices",

abstract = "Cobalt-based superalloy microlattices with γ/γ′ microstructure are manufactured by combining two additive methods: ink-extrusion 3D-printing and pack-cementation surface alloying. First, a microlattice green structure is 3D-printed at ambient temperature from inks comprised of Co3O4, NiO, and WO3 powders, an elastomeric binder and solvents. Organic removal followed by oxide reduction under Ar-5% H2, sintering and homogenization at 1250 °C lead to a metallic microlattice with dense struts with uniform γ (fcc)-Co–22Ni–8W (at.%) composition. Second, aluminum is deposited on the strut surfaces via pack-cementation at 1000 °C, diffused at 1300 °C through the strut volume to achieve a uniform composition (Co–20Ni–6W–10Al or Co–18Ni–5W–13Al, at.%), and precipitated during aging at 900 °C as γ′ precipitates within the γ matrix. The compressive strength, ductility and energy absorption of these γ/γ′ Co-based precipitation-strengthened microlattices is measured at ambient temperatures for two aging time (16 and 65 h) and found to be much superior to those of an unalloyed Co microlattice.",

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author = "Hyeji Park and Heeman Choe and Dunand, {David C.}",

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N2 - Cobalt-based superalloy microlattices with γ/γ′ microstructure are manufactured by combining two additive methods: ink-extrusion 3D-printing and pack-cementation surface alloying. First, a microlattice green structure is 3D-printed at ambient temperature from inks comprised of Co3O4, NiO, and WO3 powders, an elastomeric binder and solvents. Organic removal followed by oxide reduction under Ar-5% H2, sintering and homogenization at 1250 °C lead to a metallic microlattice with dense struts with uniform γ (fcc)-Co–22Ni–8W (at.%) composition. Second, aluminum is deposited on the strut surfaces via pack-cementation at 1000 °C, diffused at 1300 °C through the strut volume to achieve a uniform composition (Co–20Ni–6W–10Al or Co–18Ni–5W–13Al, at.%), and precipitated during aging at 900 °C as γ′ precipitates within the γ matrix. The compressive strength, ductility and energy absorption of these γ/γ′ Co-based precipitation-strengthened microlattices is measured at ambient temperatures for two aging time (16 and 65 h) and found to be much superior to those of an unalloyed Co microlattice.

AB - Cobalt-based superalloy microlattices with γ/γ′ microstructure are manufactured by combining two additive methods: ink-extrusion 3D-printing and pack-cementation surface alloying. First, a microlattice green structure is 3D-printed at ambient temperature from inks comprised of Co3O4, NiO, and WO3 powders, an elastomeric binder and solvents. Organic removal followed by oxide reduction under Ar-5% H2, sintering and homogenization at 1250 °C lead to a metallic microlattice with dense struts with uniform γ (fcc)-Co–22Ni–8W (at.%) composition. Second, aluminum is deposited on the strut surfaces via pack-cementation at 1000 °C, diffused at 1300 °C through the strut volume to achieve a uniform composition (Co–20Ni–6W–10Al or Co–18Ni–5W–13Al, at.%), and precipitated during aging at 900 °C as γ′ precipitates within the γ matrix. The compressive strength, ductility and energy absorption of these γ/γ′ Co-based precipitation-strengthened microlattices is measured at ambient temperatures for two aging time (16 and 65 h) and found to be much superior to those of an unalloyed Co microlattice.

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Microstructure and compressive properties of 3D-extrusion-printed, aluminized cobalt-based superalloy microlattices

Abstract

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Keywords

ASJC Scopus subject areas

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