TY - JOUR
T1 - An overview of Ni-based superalloy 718 fabricated via arc-based directed energy deposition
AU - Farias, Francisco Werley Cipriano
AU - Duarte, Valdemar Rebelo
AU - Payão Filho, João da Cruz
AU - dos Santos, Telmo Jorge Gomes
AU - Oliveira, João Pedro
N1 - Funding Information:
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50025%2F2020/PT#
info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0037%2F2020/PT#
info:eu-repo/grantAgreement/FCT/Concurso de avaliação no âmbito do Programa Plurianual de Financiamento de Unidades de I&D (2017%2F2018) - Financiamento Base/UIDB%2F50025%2F2020/PT#
info:eu-repo/grantAgreement/FCT/Financiamento do Plano Estratégico de Unidades de I&D - 2019/UID%2FEMS%2F00667%2F2019/PT#
info:eu-repo/grantAgreement/FCT//2022.13870.BD/PT#
This activity has received funding from the European Institute of Innovation and Technology (EIT) Raw Materials through the project Smart WAAM: Microstructural Engineering and Integrated Non-Destructive Testing.
Publisher Copyright:
© 2025 The Society of Manufacturing Engineers
PY - 2025/9/15
Y1 - 2025/9/15
N2 - The age-hardened Ni-based superalloy 718 (UNS N07718; Inconel® 718) is recognized for its high cost, low machinability, and good weldability, making it suitable for additive manufacturing, particularly arc-based directed energy deposition (DED) processes. However, due to its coarse and highly oriented microstructure, interdendritic segregation of alloying elements (e.g., Nb and Mo), and the presence of deleterious second phases (e.g., Laves and MC-type carbides), Inconel® 718 fabricated via arc-based DED generally exhibits a low response to post-deposition heat treatment. As a result, it often fails to meet typical material specifications (e.g., AMS 5662) and corrosion resistance criteria, limiting its use in mission-critical applications such as the aerospace, defense, and energy industries. In this context, the present review critically examines the limitations, potential benefits, and processing conditions associated with Inconel® 718 fabricated via arc-based DED, surveying the existing body of research on this material. Thus, the microstructure, heat treatment response, mechanical properties, and printability of arc-based DED Inconel® 718 are comprehensively discussed and correlated with the metallurgical and process characteristics.
AB - The age-hardened Ni-based superalloy 718 (UNS N07718; Inconel® 718) is recognized for its high cost, low machinability, and good weldability, making it suitable for additive manufacturing, particularly arc-based directed energy deposition (DED) processes. However, due to its coarse and highly oriented microstructure, interdendritic segregation of alloying elements (e.g., Nb and Mo), and the presence of deleterious second phases (e.g., Laves and MC-type carbides), Inconel® 718 fabricated via arc-based DED generally exhibits a low response to post-deposition heat treatment. As a result, it often fails to meet typical material specifications (e.g., AMS 5662) and corrosion resistance criteria, limiting its use in mission-critical applications such as the aerospace, defense, and energy industries. In this context, the present review critically examines the limitations, potential benefits, and processing conditions associated with Inconel® 718 fabricated via arc-based DED, surveying the existing body of research on this material. Thus, the microstructure, heat treatment response, mechanical properties, and printability of arc-based DED Inconel® 718 are comprehensively discussed and correlated with the metallurgical and process characteristics.
KW - Directed energy deposition
KW - Heat treatment
KW - Inconel 718
KW - Ni-based superalloys
KW - Wire arc additive manufacturing
UR - https://www.scopus.com/pages/publications/105007757055
U2 - 10.1016/j.jmapro.2025.06.005
DO - 10.1016/j.jmapro.2025.06.005
M3 - Review article
AN - SCOPUS:105007757055
SN - 1526-6125
VL - 149
SP - 892
EP - 916
JO - Journal of Manufacturing Processes
JF - Journal of Manufacturing Processes
ER -