Influence of Y2O3 reinforcement particles during heat treatment of IN718 composite produced by laser powder bed fusion

² Singapore Centre for 3D Printing, School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue 639798, Singapore

³ Singapore Institute of Manufacturing Technology (SIMTech), Agency for Science, Technology and Research (A*STAR), Additive Manufacturing Division, 5 Cleantech Loop, CleanTech Two Block B 636732, Singapore

MSAM 2022, 1(4), 25 https://doi.org/10.18063/msam.v1i4.25

Accepted: 7 December 2022 | Published: 22 December 2022

© 2022 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )

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Abstract

A metal matrix composite with Inconel 718 as the base metal and yttrium oxide (Y₂O₃) as the reinforcement particles was fabricated by the laser powder bed fusion technology. This paper presents a comprehensive study on the influence of the Y₂O₃reinforcement particles on the microstructures and mechanical properties of the heat-treated printed composite. Complex precipitates formation between the Y₂O₃nanoparticles and the carbonitride precipitates were shown. The complex precipitates separated into individual Y₂O₃and titanium nitride (TiN) nanoparticles after heat treatment. Nano-sized Y-Ti-O precipitates were observed after solutionization due to the release of supersaturated Y in the metal matrix. Grain refinement was also observed in the heat-treated composites due to the high number of nano-sized precipitates. After solutionizing and aging, the grain size of the Y₂O₃-reinforced sample is 28.2% and 33.9% smaller, respectively, than that of the monolithic Inconel 718 sample. This effectively reduced the segregation of Nbat the grain boundaries and thus, γ′ and γ′′ precipitates were distributed in the metal matrix more homogeneously. Combined with the increased Orowan strengthening from a significantly higher number of nano-sized precipitates and grain boundary strengthening, the composite achieved higher yield strength, and ultimate tensile strength (1099.3 MPa and 1385.5 MPa, respectively) than those of the monolithic Inconel 718 (1015.5 MPa and 1284.3 MPa, respectively).

Keywords

Laser powder bed fusion

Additive manufacturing

Inconel 718

Y2O3 reinforcement

Heat treatment

Editorial Disclosure

Sharon Mui Ling Nai serves as the Editorial Board Member of the journal, but did not in any way involve in the editorial and peer-review process conducted for this paper, directly or indirectly.

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