Metal matrix composite with superior ductility at 800 °C: 3D printed In718+ZrB2 by laser powder bed fusion

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We investigated the microstructural and mechanical properties of ZrB2 fortified Inconel 718 (In718+ZrB2) superalloy metal matrix composite (MMC), which was produced via Laser Powder Bed Fusion (LPBF). 2 vol% ZrB2 nano powders (below 100 nm in diameter) were decorated on the surfaces of Inconel 718 alloy powders by high-speed blender. Microstructural analysis of the as-printed specimens showed that the ZrB2 decomposed during LPBF, which promoted the formation of homogeneously distributed (Zr, Ni)-based intermetallic and (Nb, Mo, Cr)-based boride nanoparticles in the matrix. The 3D printed In718+ZrB2 has remarkably lower porosity and smaller grain size compared to 3D printed In718 fabricated under the same LPBF conditions. The mechanical performance of the as-printed and heat-treated In718+ZrB2 showed significantly higher room temperature (RT) hardness, RT yield strength (σYS), and RT ultimate tensile strength (σUTS) compared to In718. High-temperature tensile tests at 800 °C showed that In718+ZrB2 has ∼10× tensile ductility with higher σYS (10 %) and σUTS (8 %) than pure In718.
Publisher
ELSEVIER SCI LTD
Issue Date
2024-01
Language
English
Article Type
Article
Citation

COMPOSITES PART B-ENGINEERING, v.268

ISSN
1359-8368
DOI
10.1016/j.compositesb.2023.111052
URI
http://hdl.handle.net/10203/314096
Appears in Collection
ME-Journal Papers(저널논문)
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