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Influence of heat treatment on the high temperature properties of Inconel 718 fabricated via Laser Beam Powder Bed Fusion
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M. White,
A. Bordin,
L. Ednie ,
R. Huff,
S. Vunnam,
L. Becker ,
Robert Lancaster
Journal of Materials Research and Technology, Volume: 36, Pages: 9881 - 9897
Swansea University Author:
Robert Lancaster
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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...
| Published in: | Journal of Materials Research and Technology |
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| ISSN: | 2238-7854 |
| Published: |
Elsevier BV
2025
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| Online Access: |
Check full text
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa69559 |
| 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 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. |
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| Keywords: |
Additive manufacture, Dynamic strain aging, Inconel 718, Laser beam powder bed fusion |
| College: |
Faculty of Science and Engineering |
| Funders: |
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. |
| Start Page: |
9881 |
| End Page: |
9897 |