Effect of Heat Treatment on the Microstructure and Hardness of Ni-Based Alloy 718 in a Variable Thickness Geometry Deposited by Powder Fed Directed Energy Deposition

Feature addition to existing parts is a trending application for Directed Energy Deposition (DED) and can be used to add complex geometry features to basic forged geometries with the aim to reduce and simplify the number of processing steps as machining and assembling. However, the mechanical proper...

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Bibliographic Details
Published inMetals (Basel ) Vol. 12; no. 6; p. 952
Main Authors Ramiro, Pedro, Galarraga, Haize, Pérez-Checa, Anabel, Ortiz, Mikel, Alberdi, Amaia, Bhujangrao, Trunal, Morales, Elena, Ukar, Eneko
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2022
Subjects
Additive manufacturing
alloy 718
Alloys
Aluminum oxide
Carbon nitride
Deposition
directed energy deposition
Geometry
Hardness
Heat treating
Heat treatment
Lasers
Machining
Mechanical properties
Microstructure
Nickel base alloys
Nuclear power plants
powder
Specifications
Substrates
Superalloys
Titanium nitride
Variable thickness
United States > US
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Summary:Feature addition to existing parts is a trending application for Directed Energy Deposition (DED) and can be used to add complex geometry features to basic forged geometries with the aim to reduce and simplify the number of processing steps as machining and assembling. However, the mechanical properties of as-deposited Inconel 718 fabricated by Powder-fed Directed Energy Deposition (Powder-fed DED) are far lower than the relevant specifications, making it necessary to apply different heat treatment with the purpose of improving deposited material performance. In addition, the effects of heat treatments in both variable thickness deposited geometry and forge substrate have not been studied. In this study, the effect of heat treatment within the Aerospace Materials Specifications (AMS) for cast and wrought Inconel 718 on the microstructure and hardness of both the Ni-Based Alloy 718 deposited geometry and substrate are analyzed in different parts of the geometry. The microstructure of all samples (as-deposited and heat-treated) is analyzed by Scanning Electron Microscope (SEM) and Energy Dispersive Spectrometer (EDS), confirming the formation of aluminum oxides and titanium nitrides and carbonitrides in the deposited structure.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12060952