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A comparative analysis between material extrusion and other additive manufacturing techniques: Defects, microstructure and corrosion behavior in nickel alloy 625

TitoloA comparative analysis between material extrusion and other additive manufacturing techniques: Defects, microstructure and corrosion behavior in nickel alloy 625
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2023
AutoriCarrozza, A., Lorenzi S., Carugo F., Fest-Santini S., Santini M., Marchese G., Barbieri Giuseppe, Cognini Francesco, Cabrini M., and Pastore T.
RivistaMaterials and Design
Volume225
Type of ArticleArticle
ISSN02641275
Parole chiave3D printers, Additives, Alloy 625, Alloy production, Comparative analyzes, Computerized tomography, Corrosion behaviour, Corrosive effects, Defect microstructure, Extrusion, Grain boundaries, Laser powders, Manufacturing IS, Manufacturing techniques, Material extrusion, Microstructure, Morphology, Ni alloys, Nickel alloys
Abstract

Additive manufacturing (AM) is becoming a consolidated reality for nickel alloys production in recent years. Among the several technologies available, material extrusion (MEX) is gaining industrial interest. However, its qualification is fundamental to achieve high-value applications. In this work, Ni alloy 625 produced using different AM techniques was comparatively analyzed in terms of process-related defects, microstructure and corrosion behavior. Specimens manufactured via MEX, laser powder bed fusion (PBF-LB), and directed energy deposition (DED-LB) were investigated. The MEX-produced samples showed micropores and periodically-arranged elongated macro-defects. These were analyzed in terms of image analysis and micro computed tomography. The resulting void 3D structure was mainly constituted by a grid of hollow channels, mimicking the ± 45° scanning strategy adopted. The microstructure was mainly constituted by Mo-, Nb- and Si-rich precipitates in a Ni matrix. The second phases had a blocky morphology in the core part of the material. Conversely, an elongated shape following the grain boundaries was detected in the contour. These microstructural variations impacted on the response of the alloy in an aggressive environment (ASTM G28-A). In fact, the core underwent a localized attack, whilst the contour part was characterized by a negligible effect, as assessed in the PBF-LB and DED-LB-processed specimens. © 2022

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Cited by: 0; All Open Access, Gold Open Access

URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85144816614&doi=10.1016%2fj.matdes.2022.111545&partnerID=40&md5=89f8e3dfd6af578f4bd4c7f016916e65
DOI10.1016/j.matdes.2022.111545
Citation KeyCarrozza2023