Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities

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Show simple item record Wood, Paul Díaz Álvarez, Antonio Díaz Álvarez, José Miguélez Garrido, María Henar Rusinek, Alexis Gunputh, Urvashi F. Williams, Gavin Bahi, Slim Sienkiewicz, Judyta Platek, Pawel 2021-09-01T10:29:52Z 2021-09-01T10:29:52Z 2020-12-02
dc.identifier.bibliographicCitation Wood, P., Díaz-Álvarez, A., Díaz-Álvarez, J., Miguélez, M. H., Rusinek, A., Gunputh, U. F., Williams, G., Bahi, S., Sienkiewicz, J. & Płatek, P. (2020). Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities. Materials, 13(24), 5730.
dc.identifier.issn 1996-1944
dc.description.abstract Products produced by additive manufacturing (AM) seek to exploit net shape manufacturing by eliminating or minimizing post-process stages such as machining. However, many applications which include turbo machinery components with tight dimensional tolerances and a smooth surface finish will require at least a light machine finishing stage. This paper investigates the machinability of the additively fabricated INCONEL718 (IN718) alloy produced by laser melting powder bed fusion (LM-PBF) with different levels of spherical porosity in the microstructure. The literature suggests that the band width for laser energy density, which combines the various scan process parameters to obtain a low spherical type porosity in the LM-PBF IN718 alloy (~1%), has wide breadth. With the increasing laser energy density and above a threshold, there is a rapid increase in the spherical pore size. In this paper, three tube samples each with different levels of spherical porosity were fabricated by varying the laser energy density for LM-PBF of the IN718 alloy within the stable and higher energy density range and the porosity measured. A low laser energy density was avoided due to balling up, which promotes highly irregular lack of fusion defects and poor consolidation within the alloy microstructure. An orthogonal turning test instrumented, with a three-component dynamometer to measure the cutting forces, was performed on AM produced IN718 tube samples under light cut conditions to simulate a finish machining process. The orthogonal turning tests were also performed on a tube sample obtained from the wrought extruded stock. The machining process parameters, which were studied include varying the cutting speed at three levels, at a fixed feed and under dry cut conditions for a short duration to avoid the tool wear. The results obtained were discussed and a notable finding was the higher rate of built-up-edge formation on the tool tip from the AM samples with a higher porosity and especially at a higher cutting speed. The paper also discusses the mechanisms that underpin the findings.
dc.format.extent 13
dc.language.iso eng
dc.publisher MDPI
dc.rights © 2020 by the authors.
dc.rights Atribución 3.0 España
dc.subject.other SLM
dc.subject.other Additive manufacturing
dc.subject.other Spherical porosity
dc.subject.other Machining
dc.subject.other Powder Bed Fusion
dc.subject.other INCONEL718
dc.title Machinability of INCONEL718 Alloy with a Porous Microstructure Produced by Laser Melting Powder Bed Fusion at Higher Energy Densities
dc.type research article
dc.subject.eciencia Ingeniería Mecánica
dc.rights.accessRights open access
dc.identifier.publicationissue 24
dc.identifier.publicationtitle Materials
dc.identifier.publicationvolume 13
dc.identifier.uxxi AR/0000028300
dc.affiliation.dpto UC3M. Departamento de Ingeniería Mecánica
dc.affiliation.grupoinv UC3M. Grupo de Investigación: Tecnologías de Fabricación y Diseño de Componentes Mecánicos y Biomecánicos
dc.affiliation.area UC3M. Área de Ingeniería Mecánica
dc.type.hasVersion VoR
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