Strengthening additively manufactured Inconel 718 through in-situ formation of nanocarbides and silicides

Emre Tekoğlu; Alexander D. O'Brien; Jian Liu; Baoming Wang; Sina Kavak; Yong Zhang; So Yeon Kim; Shitong Wang; Duygu Ağaoğulları; Wen Chen; A. John Hart; Ju Li

doi:10.1016/j.addma.2023.103478

Strengthening additively manufactured Inconel 718 through in-situ formation of nanocarbides and silicides

Emre Tekoğlu
, Alexander D. O'Brien
, Jian Liu
, Baoming Wang
, Sina Kavak
, Yong Zhang
, So Yeon Kim
, Shitong Wang
, Duygu Ağaoğulları
, Wen Chen^*
, A. John Hart
, Ju Li^*

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Massachusetts Institute of Technology
University of Massachusetts
Istanbul Technical University

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

74 Citations (Scopus)

Abstract

We report additive manufacturing (AM) of a nickel superalloy metallic matrix composite (Ni-MMC) using laser powder bed fusion (LPBF). Nanoceramic-containing composite powders were prepared by high-speed blender declustering and ball milling of as-received SiC nanowires (2 vol%) and Inconel 718 alloy powders, which produced a homogeneous decoration of SiC on the surfaces of Inconel particles. Analysis of the as-printed specimens revealed the dissolution of SiC nanowires during laser melting, leading to the in-situ formation of Nb- and Ti-based silicide and carbide nanoparticles. These in-situ formed nanoparticles resulted in a more desirable solidification microstructure of the AM Inconel 718 with fewer printing defects (cracks and pores) and slightly refined grain sizes. Mechanical characterization of the as-printed Ni-MMCs revealed notable increases in hardness, yield strength (by 16%), and ultimate tensile strength (σ_UTS, by 12%) compared to the reference samples without SiC addition. After heat treatment, the same composite samples displayed a 10% higher σ_UTS compared to identically treated unreinforced material while maintaining ∼14% total tensile elongation. We believe this in-situ precipitate formation presents a simple and effective method for strengthening additively manufactured high-temperature materials that could be used in the increasingly harsh environments in energy and propulsion applications.

Original language	English
Article number	103478
Journal	Additive Manufacturing
Volume	67
DOIs	https://doi.org/10.1016/j.addma.2023.103478
Publication status	Published - 5 Apr 2023

Bibliographical note

Publisher Copyright:
© 2023

Funding

This work was supported by Eni S.p.A. through the MIT Energy Initiative, The Scientific and Technological Research Council of Turkey (TUBITAK) under Grant No. 1059B192000941 , and ARPA-E ( DE-AR0001434 ). WC acknowledges support by the National Science Foundation ( DMR-2004429 ). ADO acknowledges support by NSF GRFP Award #4999143677 . SK and DA acknowledge the support by Istanbul Technical University Scientific Research Projects Unit with a project (No: MUA-2021–43196 ) entitled "Production and Characterization of Boron Containing Metallic Nanocomposites via Additive Manufacturing".

Funders	Funder number
Eni S.p.A.
MIT Energy Initiative
National Science Foundation	DMR-2004429, 4999143677
Advanced Research Projects Agency - Energy	DE-AR0001434
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu	1059B192000941
Bilimsel Araştırma Projeleri Birimi, İstanbul Teknik Üniversitesi	MUA-2021–43196

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 9 Industry, Innovation, and Infrastructure

Keywords

Additive manufacturing
In-situ alloying
Laser powder bed fusion
Mechanical property
Ni-based superalloy

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10.1016/j.addma.2023.103478

Cite this

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title = "Strengthening additively manufactured Inconel 718 through in-situ formation of nanocarbides and silicides",

abstract = "We report additive manufacturing (AM) of a nickel superalloy metallic matrix composite (Ni-MMC) using laser powder bed fusion (LPBF). Nanoceramic-containing composite powders were prepared by high-speed blender declustering and ball milling of as-received SiC nanowires (2 vol\%) and Inconel 718 alloy powders, which produced a homogeneous decoration of SiC on the surfaces of Inconel particles. Analysis of the as-printed specimens revealed the dissolution of SiC nanowires during laser melting, leading to the in-situ formation of Nb- and Ti-based silicide and carbide nanoparticles. These in-situ formed nanoparticles resulted in a more desirable solidification microstructure of the AM Inconel 718 with fewer printing defects (cracks and pores) and slightly refined grain sizes. Mechanical characterization of the as-printed Ni-MMCs revealed notable increases in hardness, yield strength (by 16\%), and ultimate tensile strength (σUTS, by 12\%) compared to the reference samples without SiC addition. After heat treatment, the same composite samples displayed a 10\% higher σUTS compared to identically treated unreinforced material while maintaining ∼14\% total tensile elongation. We believe this in-situ precipitate formation presents a simple and effective method for strengthening additively manufactured high-temperature materials that could be used in the increasingly harsh environments in energy and propulsion applications.",

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author = "Emre Tekoğlu and O'Brien, \{Alexander D.\} and Jian Liu and Baoming Wang and Sina Kavak and Yong Zhang and Kim, \{So Yeon\} and Shitong Wang and Duygu Ağaoğulları and Wen Chen and Hart, \{A. John\} and Ju Li",

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AU - Tekoğlu, Emre

AU - O'Brien, Alexander D.

AU - Liu, Jian

AU - Wang, Baoming

AU - Kavak, Sina

AU - Zhang, Yong

AU - Kim, So Yeon

AU - Wang, Shitong

AU - Ağaoğulları, Duygu

AU - Chen, Wen

AU - Hart, A. John

AU - Li, Ju

PY - 2023/4/5

Y1 - 2023/4/5

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AB - We report additive manufacturing (AM) of a nickel superalloy metallic matrix composite (Ni-MMC) using laser powder bed fusion (LPBF). Nanoceramic-containing composite powders were prepared by high-speed blender declustering and ball milling of as-received SiC nanowires (2 vol%) and Inconel 718 alloy powders, which produced a homogeneous decoration of SiC on the surfaces of Inconel particles. Analysis of the as-printed specimens revealed the dissolution of SiC nanowires during laser melting, leading to the in-situ formation of Nb- and Ti-based silicide and carbide nanoparticles. These in-situ formed nanoparticles resulted in a more desirable solidification microstructure of the AM Inconel 718 with fewer printing defects (cracks and pores) and slightly refined grain sizes. Mechanical characterization of the as-printed Ni-MMCs revealed notable increases in hardness, yield strength (by 16%), and ultimate tensile strength (σUTS, by 12%) compared to the reference samples without SiC addition. After heat treatment, the same composite samples displayed a 10% higher σUTS compared to identically treated unreinforced material while maintaining ∼14% total tensile elongation. We believe this in-situ precipitate formation presents a simple and effective method for strengthening additively manufactured high-temperature materials that could be used in the increasingly harsh environments in energy and propulsion applications.

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KW - In-situ alloying

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KW - Mechanical property

KW - Ni-based superalloy

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Strengthening additively manufactured Inconel 718 through in-situ formation of nanocarbides and silicides

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

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