TY  - JOUR
AU  - Cipriano Farias, Francisco Werley
AU  - Duarte, Valdemar R.
AU  - Filho, João da Cruz Payão
AU  - Figueiredo, Arthur Ribeiro
AU  - Schell, Norbert
AU  - Maawad, Emad
AU  - Li, J. Y.
AU  - Zhang, Y.
AU  - Bordas-Czaplicki, Mélanie
AU  - Fonseca, Fabio Machado Alves da
AU  - Cormier, Jonathan
AU  - Santos, Telmo G.
AU  - Oliveira, Joao Pedro
TI  - High-performance Ni-based superalloy 718 fabricated via arc plasma directed energy deposition: effect of post-deposition heat treatments on microstructure and mechanical properties
JO  - Additive manufacturing
VL  - 88
SN  - 2214-8604
CY  - Amsterdam [u.a.]
PB  - Elsevier
M1  - PUBDB-2024-04818
SP  - 104252
PY  - 2024
AB  - Ni-based superalloy 718 fabricated via arc plasma direct energy deposition (IN718 AP-DED) exhibit a limitedresponse to heat treatment due to its coarse primary microstructure and interdendritic segregation, which mayprevent its use in high-integrity applications. Thus, dedicated heat treatments for IN718 AP-DED must possess ahomogenization temperature as high as possible to significantly dissolve the eutectics and increase the γ′′-formerelements in solid-solution. The present work proposed heat treatments for IN718 AP-DED (homogenization –1050, 1100, 1142, and 1185 ◦C / 2 h – followed by aging – 718 ◦C / 8 h, cooling at 56 ◦C / h, and 621 ◦C / 8 h).The as-built IN718 AP-DED showed the typical coarse and oriented (cube texture) microstructure with eutectics(Laves and MC-typical carbides) in the interdendritic region, which were significantly dissolved during thehomogenization, promoting a high-volume fraction of hardening phase (γ′′ and γ′) and outstanding quasi-staticmechanical properties after the aging step. The present work showed that IN718 AP-DED mechanical propertiescan be optimized through dedicated heat treatments, meeting the ductility and yield strength requirements(room temperature) of AMS 5662. Furthermore, the heat treatments did not alter the grain morphology andtexture aspect, inducing a lower Young’s modulus compared to the non-oriented material.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001259648500001
DO  - DOI:10.1016/j.addma.2024.104252
UR  - https://bib-pubdb1.desy.de/record/611072
ER  -