Journal Article

PUBDB-2024-04818

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High-performance Ni-based superalloy 718 fabricated via arc plasma directed energy deposition: effect of post-deposition heat treatments on microstructure and mechanical properties

Cipriano Farias, F. W. (Corresponding author)Extern* ; Duarte, V. R. ; Filho, J. d. C. P. ; Figueiredo, A. R. ; Schell, N.HZG*Hereon* ; Maawad, E.HZG*Hereon* ; Li, J. Y. ; Zhang, Y. ; Bordas-Czaplicki, M. ; Fonseca, F. M. A. d. ; Cormier, J.Extern* ; Santos, T. G. ; Oliveira, J. P. (Corresponding author)Extern*

2024
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.addma.2024.104252  doi:10.3204/PUBDB-2024-04818

Abstract: 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.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)
2. Helmholtz-Zentrum Hereon (Hereon)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. CALIPSOplus - Convenient Access to Light Sources Open to Innovation, Science and to the World (730872) (730872)
3. FS-Proposal: I-20210986 EC (I-20210986-EC) (I-20210986-EC)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2024

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Essential Science Indicators ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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