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Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion

P.E. May Orcid Logo, M. White, A. Bordin, L. Ednie Orcid Logo, R. Huff, S. Vunnam, L. Becker Orcid Logo, Robert Lancaster Orcid Logo

Journal of Materials Research and Technology, Volume: 36, Pages: 9881 - 9897

Swansea University Author: Robert Lancaster Orcid Logo

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DOI (Published version): 10.1016/j.jmrt.2025.05.140

Abstract

This study investigates the influence of post-manufacture heat treatments on the high-temperature performance of Inconel 718 produced via Laser Beam Powder Bed Fusion (LB-PBF). Two industrially relevant heat treatment routes were explored: one optimised for low cycle fatigue (HT1) and the other for...

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Published in: Journal of Materials Research and Technology
ISSN: 2238-7854
Published: Elsevier BV 2025
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URI: https://cronfa.swan.ac.uk/Record/cronfa69559
first_indexed 2025-05-22T13:55:30Z
last_indexed 2025-06-13T08:08:24Z
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Two industrially relevant heat treatment routes were explored: one optimised for low cycle fatigue (HT1) and the other for creep resistance (HT2), and their effects were compared against as-received (AR) LB-PBF and conventionally wrought IN718. Mechanical testing, including tensile, constant load creep, and strain-controlled low cycle fatigue (LCF) at 650&#x202F;&#xB0;C, was complemented by extensive microstructural characterisation via EBSD, SEM, and EDX. HT1 exhibited a significantly refined microstructure, enhanced twin density, and promoted fine, well-distributed secondary phases, resulting in superior fatigue performance and creep resistance comparable to wrought material. HT2, while enhancing tensile strength and hardness relative to AR, offered limited improvement in creep resistance. All LB-PBF variants exhibited lower ductility and more heterogeneous dynamic strain aging (DSA) behaviour than the wrought alloy. 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spelling 2025-06-11T10:35:08.2634459 v2 69559 2025-05-22 Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion e1a1b126acd3e4ff734691ec34967f29 0000-0002-1365-6944 Robert Lancaster Robert Lancaster true false 2025-05-22 EAAS This study investigates the influence of post-manufacture heat treatments on the high-temperature performance of Inconel 718 produced via Laser Beam Powder Bed Fusion (LB-PBF). Two industrially relevant heat treatment routes were explored: one optimised for low cycle fatigue (HT1) and the other for creep resistance (HT2), and their effects were compared against as-received (AR) LB-PBF and conventionally wrought IN718. Mechanical testing, including tensile, constant load creep, and strain-controlled low cycle fatigue (LCF) at 650 °C, was complemented by extensive microstructural characterisation via EBSD, SEM, and EDX. HT1 exhibited a significantly refined microstructure, enhanced twin density, and promoted fine, well-distributed secondary phases, resulting in superior fatigue performance and creep resistance comparable to wrought material. HT2, while enhancing tensile strength and hardness relative to AR, offered limited improvement in creep resistance. All LB-PBF variants exhibited lower ductility and more heterogeneous dynamic strain aging (DSA) behaviour than the wrought alloy. The study demonstrates that tailored heat treatments can enhance the high-temperature mechanical performance of LB-PBF IN718, with HT1 identified as the most effective approach for fatigue-critical applications. Journal Article Journal of Materials Research and Technology 36 9881 9897 Elsevier BV 2238-7854 Additive manufacture, Dynamic strain aging, Inconel 718, Laser beam powder bed fusion 1 5 2025 2025-05-01 10.1016/j.jmrt.2025.05.140 COLLEGE NANME Engineering and Applied Sciences School COLLEGE CODE EAAS Swansea University External research funder(s) paid the OA fee (includes OA grants disbursed by the Library) The current research was funded under the EPSRC Industrial Case Award EP/T517987/1. The provisions of research bursary, materials, and supporting information from ASTM AMCoE is gratefully acknowledged. Mechanical tests were performed at Swansea Materials Research and Testing Ltd. (SMaRT). Utilisation of the FEG-SEM was provided by Swansea University’s Faculty of Science & Engineering Advanced Imaging of Materials (AIM) Facility, which was funded in part by the EPSRC (EP/M028267/1), The European Regional Development Fund through the Welsh Government (80708) and the Ser Solar project via the Welsh Government. 2025-06-11T10:35:08.2634459 2025-05-22T14:47:43.6922230 Faculty of Science and Engineering School of Engineering and Applied Sciences - Materials Science and Engineering P.E. May 0009-0005-6550-3850 1 M. White 2 A. Bordin 3 L. Ednie 0000-0002-3217-7623 4 R. Huff 5 S. Vunnam 6 L. Becker 0009-0008-4552-7929 7 Robert Lancaster 0000-0002-1365-6944 8 69559__34388__8f0065dd1b854fef8983c8dd818d7a13.pdf 69559.VOR.pdf 2025-06-03T16:48:00.1919367 Output 23402370 application/pdf Version of Record true © 2025 The Author(s). This is an open access article under the CC BY license. true eng http://creativecommons.org/licenses/by/4.0/
title Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
spellingShingle Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
Robert Lancaster
title_short Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
title_full Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
title_fullStr Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
title_full_unstemmed Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
title_sort Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
author_id_str_mv e1a1b126acd3e4ff734691ec34967f29
author_id_fullname_str_mv e1a1b126acd3e4ff734691ec34967f29_***_Robert Lancaster
author Robert Lancaster
author2 P.E. May
M. White
A. Bordin
L. Ednie
R. Huff
S. Vunnam
L. Becker
Robert Lancaster
format Journal article
container_title Journal of Materials Research and Technology
container_volume 36
container_start_page 9881
publishDate 2025
institution Swansea University
issn 2238-7854
doi_str_mv 10.1016/j.jmrt.2025.05.140
publisher Elsevier BV
college_str Faculty of Science and Engineering
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hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Materials Science and Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Materials Science and Engineering
document_store_str 1
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description This study investigates the influence of post-manufacture heat treatments on the high-temperature performance of Inconel 718 produced via Laser Beam Powder Bed Fusion (LB-PBF). Two industrially relevant heat treatment routes were explored: one optimised for low cycle fatigue (HT1) and the other for creep resistance (HT2), and their effects were compared against as-received (AR) LB-PBF and conventionally wrought IN718. Mechanical testing, including tensile, constant load creep, and strain-controlled low cycle fatigue (LCF) at 650 °C, was complemented by extensive microstructural characterisation via EBSD, SEM, and EDX. HT1 exhibited a significantly refined microstructure, enhanced twin density, and promoted fine, well-distributed secondary phases, resulting in superior fatigue performance and creep resistance comparable to wrought material. HT2, while enhancing tensile strength and hardness relative to AR, offered limited improvement in creep resistance. All LB-PBF variants exhibited lower ductility and more heterogeneous dynamic strain aging (DSA) behaviour than the wrought alloy. The study demonstrates that tailored heat treatments can enhance the high-temperature mechanical performance of LB-PBF IN718, with HT1 identified as the most effective approach for fatigue-critical applications.
published_date 2025-05-01T05:29:58Z
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score 11.096068

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