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Experimental and Numerical Investigation of Mechanical Properties of Laser-Welded Additively Manufactured Inconel 718

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Abstract:

This study investigates the effects of different welding and heat treatment sequences on the mechanical and microstructural properties of laser powder bed fusion (PBF-LB) fabricated Inconel 718. Three conditions were examined: laser welding of as-built material (LW-built), welding after heat treatment (HT-LW), and welding followed by post-weld heat treatment (LW-HT). Tensile testing, microscopy, fractography, and finite element simulations were used to evaluate performance. The LW-HT condition exhibited the highest strength (UTS ~1430 MPa) and the most uniform stress distribution, attributed to the re-precipitation of laves/δ phases during post-weld aging. In contrast, the HT-LW condition showed localized softening and early failure due to precipitate dissolution in the fusion zone. Fracture surface analysis confirmed enhanced ductility in LW-built and refined microstructural features in LW-HT. These findings demonstrate that post-weld heat treatment (LW-HT) is the most effective route for optimizing strength and structural stability in welded PBF-LB Inconel 718, with some trade-off in ductility.

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Periodical:

Materials Science Forum (Volume 1175)

Pages:

91-97

DOI:

https://doi.org/10.4028/p-0ndeId

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Online since:

January 2026

Authors:

Mahmoud Khedr*, Ali Khosravi, Ahmed W. Abdelghany, Antti Järvenpää, Atef Saad Hamada

Keywords:

Additive Manufacturing, Finite Element Analysis, Heat-Treatment, Inconel, Welding

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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