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Effect of Powder Recycling on the Fracture Behavior of Electron Beam Melted Alloy 718
Chalmers University of Technology, Department of Industrial and Materials Science, Division of Materials and Manufacture, Gothenburg, SE-412 96, Sweden.
University West, Department of Engineering Science, Division of Subtractive and Additive Manufacturing. (PTW)ORCID iD: 0000-0001-6610-1486
Chalmers University of Technology, Department of Industrial and Materials Science, Division of Materials and Manufacture, Gothenburg, SE-412 96, Sweden.
Chalmers University of Technology, Department of Industrial and Materials Science, Division of Materials and Manufacture, Gothenburg, SE-412 96, Sweden.
2018 (English)In: Powder Metallurgy Progress, ISSN 1335-8987, Vol. 18, no 1, p. 40-48Article in journal (Other academic) Published
Abstract [en]

Understanding the effect of powder feedstock alterations during multicycle additive manufacturing on the quality of built components is crucial to meet the requirements on critical parts for aerospace engine applications. In this study, powder recycling of Alloy 718 during electron beam melting was studied to understand its influence on fracture behavior of Charpy impact test bars. High resolution scanning electron microscopy was employed for fracture surface analysis on test bars produced from virgin and recycled powder. For all investigated samples, an intergranular type of fracture, initiated by non-metallic phases and bonding defects, was typically observed in the regions close to or within the contour zone. The fracture mode in the bulk of the samples was mainly moderately ductile dimple fracture. The results show a clear correlation between powder degradation during multi-cycle powder reuse and the amount of damage relevant defects observed on the fracture surfaces. In particular, samples produced from recycled powder show a significant amount of aluminum-rich oxide defects, originating from aluminum-rich oxide particulates on the surface of the recycled powder. © 2018 H. Gruber et al., published by Sciendo.

Place, publisher, year, edition, pages
de Gruyter , 2018. Vol. 18, no 1, p. 40-48
Keywords [en]
additive manufacturing of Alloy 718, electron beam melting, powder recycling, powder degradation, fractography of AM components
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-12906DOI: 10.1515/pmp-2018-0005Scopus ID: 2-s2.0-85051985288OAI: oai:DiVA.org:hv-12906DiVA, id: diva2:1251462
Funder
Vinnova
Note

Funders:  SIP LIGHTer; AoA Production at Chalmers.

Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-05-27Bibliographically approved

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Karimi Neghlani, Paria

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