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Influence of Contouring and depth of machining on tensile properties of Inconel 625 made by Electron Beam Melting
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0002-2582-9910
KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Machine and Process Technology. KTH, School of Industrial Engineering and Management (ITM), Production Engineering, Production Systems.ORCID iD: 0000-0002-5960-2159
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0003-4120-4790
2019 (English)In: Metal Additive Manufacturing Conference: Laser Melting, Electon Beam Melting & Direct Energy Deposition Processes, 2019, p. 118-127Conference paper, Published paper (Refereed)
Abstract [en]

This research is to evaluate the manufacturability and to characterize the performance of Inconel 625 (IN625) by electron beam melting (EBM). After further modifying the commercial EBM parameters for Inconel 718, such as speed function for hatching and the line offset for both hatching and multi-beam contouring, nearly full dense samples (over 99.7% of the wrought material) are produced. It is shown that no contouring strategy generates a relatively rougher surface (approximately 29% in average) compared to the samples printed with contour, requiring even a further post-process machining. Furthermore, the microhardness after EBM is comparable to as-rolled and annealed IN625 material. The samples machined from bulk specimens exhibit good tensile properties regardless of the contouring strategy due to the high depth of machining (5.5mm). However, for the near-net shaped specimens with only 2.1 mm machining of the surfaces, elongation is significantly affected by the contouring strategy. This is in such a manner that the contoured near-net shape parts show relatively 32% less elongation compared to the samples without any contour. Accordingly, multi-beam contouring is better to be avoided to reach tensile properties comparable to the wrought material after a shallow machining, despite the fact that it can lead to a relative smoother surface finish after EBM.

Place, publisher, year, edition, pages
2019. p. 118-127
Keywords [en]
Additive Manufacturing, Electron Beam Melting, Inconel 625, Near-net Shape, Mechanical Properties
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-267129OAI: oai:DiVA.org:kth-267129DiVA, id: diva2:1390873
Conference
Metal Additive Manufacturing Conference 2019. Örebro, Sweden, 25-27 Nov, 2019
Note

QC 20200204

Available from: 2020-02-03 Created: 2020-02-03 Last updated: 2020-02-04Bibliographically approved

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Zhao, XiaoyuRashid, AmirDadbakhsh, Sasan

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