Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718

Cui Er Seow; Harry Coules; Guiyi Wu; Raja Khan; Xiangfang Xu

Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718

Cui Er Seow, Harry Coules, Guiyi Wu, Raja Khan, Xiangfang Xu

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

Abstract

Wire + Arc Additive Manufacturing (WAAM) is a high deposition rate manufacturing technique which uses an electric arc and a wire feedstock to build up near net-shape components in successive layers. In this study, the effect of various heat treatments on the microstructure of WAAM Inconel (IN) 718 nickel-base superalloy was investigated. Specimens extracted from a WAAM wall, deposited using IN718 wire and a plasma arc, were subject to different heat treatments. The microstructure of as-deposited WAAM IN718 was found to contain detrimental phases showing evidence of elemental segregation during deposition. These particles were found to remain in the microstructure after a standard homogenisation, solution and aging heat treatment. Micrographs of the modified homogenisation treated material show no trace of these micro-segregated particles, indicating that they were completely dissolved into the matrix. Vickers hardness testing results suggest that the aging treatment is responsible for majority of the strengthening effects, likely due to the precipitation of γ’ and γ’’ hardening particles. A significant improvement in the microstructure and hardness was observed in the modified heat-treated material.

Original language	English
Title of host publication	Proceedings of the First European Conference on Structural Integrity of Additively Manufactured Materials (ESIAM)
Publication status	Accepted/In press - 21 May 2019

Keywords

Additive manufacture
Inconel
Mechanical properties
Heat treatment

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Persistent link

Structural integrity assessment for Wire + Arc Additive Manufacturing
Coules, H. (Principal Investigator), Seow, C. (Student), Wu, G. (Co-Investigator) & Khan, R. (Co-Investigator)
31/10/16 → 30/10/20
Project: Research

Cite this

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title = "Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718",

abstract = "Wire + Arc Additive Manufacturing (WAAM) is a high deposition rate manufacturing technique which uses an electric arc and a wire feedstock to build up near net-shape components in successive layers. In this study, the effect of various heat treatments on the microstructure of WAAM Inconel (IN) 718 nickel-base superalloy was investigated. Specimens extracted from a WAAM wall, deposited using IN718 wire and a plasma arc, were subject to different heat treatments. The microstructure of as-deposited WAAM IN718 was found to contain detrimental phases showing evidence of elemental segregation during deposition. These particles were found to remain in the microstructure after a standard homogenisation, solution and aging heat treatment. Micrographs of the modified homogenisation treated material show no trace of these micro-segregated particles, indicating that they were completely dissolved into the matrix. Vickers hardness testing results suggest that the aging treatment is responsible for majority of the strengthening effects, likely due to the precipitation of γ{\textquoteright} and γ{\textquoteright}{\textquoteright} hardening particles. A significant improvement in the microstructure and hardness was observed in the modified heat-treated material.",

keywords = "Additive manufacture, Inconel, Mechanical properties, Heat treatment",

author = "Seow, {Cui Er} and Harry Coules and Guiyi Wu and Raja Khan and Xiangfang Xu",

year = "2019",

month = may,

day = "21",

language = "English",

booktitle = "Proceedings of the First European Conference on Structural Integrity of Additively Manufactured Materials (ESIAM)",

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Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718. / Seow, Cui Er; Coules, Harry; Wu, Guiyi et al.
Proceedings of the First European Conference on Structural Integrity of Additively Manufactured Materials (ESIAM). 2019.

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718

AU - Seow, Cui Er

AU - Coules, Harry

AU - Wu, Guiyi

AU - Khan, Raja

AU - Xu, Xiangfang

PY - 2019/5/21

Y1 - 2019/5/21

N2 - Wire + Arc Additive Manufacturing (WAAM) is a high deposition rate manufacturing technique which uses an electric arc and a wire feedstock to build up near net-shape components in successive layers. In this study, the effect of various heat treatments on the microstructure of WAAM Inconel (IN) 718 nickel-base superalloy was investigated. Specimens extracted from a WAAM wall, deposited using IN718 wire and a plasma arc, were subject to different heat treatments. The microstructure of as-deposited WAAM IN718 was found to contain detrimental phases showing evidence of elemental segregation during deposition. These particles were found to remain in the microstructure after a standard homogenisation, solution and aging heat treatment. Micrographs of the modified homogenisation treated material show no trace of these micro-segregated particles, indicating that they were completely dissolved into the matrix. Vickers hardness testing results suggest that the aging treatment is responsible for majority of the strengthening effects, likely due to the precipitation of γ’ and γ’’ hardening particles. A significant improvement in the microstructure and hardness was observed in the modified heat-treated material.

AB - Wire + Arc Additive Manufacturing (WAAM) is a high deposition rate manufacturing technique which uses an electric arc and a wire feedstock to build up near net-shape components in successive layers. In this study, the effect of various heat treatments on the microstructure of WAAM Inconel (IN) 718 nickel-base superalloy was investigated. Specimens extracted from a WAAM wall, deposited using IN718 wire and a plasma arc, were subject to different heat treatments. The microstructure of as-deposited WAAM IN718 was found to contain detrimental phases showing evidence of elemental segregation during deposition. These particles were found to remain in the microstructure after a standard homogenisation, solution and aging heat treatment. Micrographs of the modified homogenisation treated material show no trace of these micro-segregated particles, indicating that they were completely dissolved into the matrix. Vickers hardness testing results suggest that the aging treatment is responsible for majority of the strengthening effects, likely due to the precipitation of γ’ and γ’’ hardening particles. A significant improvement in the microstructure and hardness was observed in the modified heat-treated material.

KW - Additive manufacture

KW - Inconel

KW - Mechanical properties

KW - Heat treatment

M3 - Conference Contribution (Conference Proceeding)

BT - Proceedings of the First European Conference on Structural Integrity of Additively Manufactured Materials (ESIAM)

ER -

Effect of post-deposition heat treatments on the microstructure and hardness of Wire + Arc Additively Manufactured Inconel 718

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Structural integrity assessment for Wire + Arc Additive Manufacturing

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