Microstructural assessment of additive-manufactured Inconel 718 samples subjected to heat treatments for enhanced mechanical properties

Cavalcante, Thiago Roberto Felisardo; Mariani, Fábio Edson; Muñoz, Jairo Alberto; Bon, Douglas Giovanni; Diaz, Julian Arnaldo Avila; Muñoz, Jessica Calvo; Ribamar, Giovani Gonçalves; Oliveira, João Pedro; de Bastos Pereira, António Manuel; Coelho, Reginaldo Teixeira

doi:10.1007/s40964-025-01279-y

Journal Article

PUBDB-2025-04439

Microstructural assessment of additive-manufactured Inconel 718 samples subjected to heat treatments for enhanced mechanical properties

Cavalcante, T. R. F.Extern* ; Bon, D. G.Extern* ; Mariani, F. E. ; Coelho, R. T. ; Muñoz, J. A. ; Muñoz, J. C. ; Ribamar, G. G.Extern*Hereon* ; Oliveira, J. P.Extern* ; de Bastos Pereira, A. M. ; Diaz, J. A. A. (Corresponding author)

2025
Springer International Publishing [Cham, Switzerland]

Progress in additive manufacturing 10, 1-19 (2025) [10.1007/s40964-025-01279-y]

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Please use a persistent id in citations: doi:10.1007/s40964-025-01279-y

Abstract: Directed energy deposition (DED), a laser additive manufacturing (AM) process, has attracted a significant attention as apotential alternative to conventional manufacturing methods, due to its high deposition efficiency, flexibility, and precision.Despite these advantages, components produced by DED often face critical challenges, including residual stresses, microsegregation, and the formation of non-equilibrium phases due to rapid cooling during the AM process. These issues areparticularly critical for Ni-based superalloys such as Inconel 718 (IN718), widely used in the aerospace, energy, and marineindustries for their excellent high-temperature strength and corrosion resistance. The mechanical performance of IN718primarily depends on precipitation hardening via γ' and γ'' phases. In contrast, the formation of deleterious phases, suchas δ and Laves, can severely impair performance by depleting key alloying elements and increasing brittleness. Thus, heattreatments (HTs) are vital in addressing these challenges by reducing microsegregation, homogenizing elemental distribution, and promoting the precipitation of strengthening phases. Therefore, this study investigates the effects of six distinctheat-treatment routes on the microstructural evolution, hardness, tensile properties, and fracture behavior of DED IN718samples. The relationship between microstructure and mechanical responses is analyzed and compared to a forged IN718counterpart. The results offer valuable insights for optimizing heat-treatment strategies to improve the structural integrityand mechanical reliability of DED-fabricated IN718 components.

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