Microstructure Investigations of Powders and Additive Manufactured Parts

This paper presents an advanced microstructural analysis of the AlSiMg, Ti64, and N700 powders used for additive manufacturing. The internal microstructure of the regular and irregular powder grains were characterized down to atomic resolution by using scanning electron microscopy and high resolutio...

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Bibliographic Details
Published in:BHM. Berg- und hüttenmännische Monatshefte 2020, Vol.165 (3), p.169-174
Main Authors: Albu, M., Mitsche, S., Nachtnebel, M., Krisper, R., Dienstleder, M., Schröttner, H., Kothleitner, G.
Format: Article
Language:English
Subjects:
Amorphous silicon
Atomizing
Crystallites
Earth and Environmental Science
Earth Sciences
Grains
Microscopy
Microstructural analysis
Microstructure
Mineral Resources
Originalarbeit
Scanning electron microscopy
Scanning transmission electron microscopy
Segregations
Titanium base alloys
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Summary:This paper presents an advanced microstructural analysis of the AlSiMg, Ti64, and N700 powders used for additive manufacturing. The internal microstructure of the regular and irregular powder grains were characterized down to atomic resolution by using scanning electron microscopy and high resolution scanning transmission electron microscopy. The accretionary forms on top of the irregular AlSiMg powder grains exhibit a slightly coarse microstructure with a network of eutectic Si consisting of nano-crystallites, suggesting a slower cooling than the grain itself that contain a predominately amorphous Si network. A nm thin amorphous C layer on the surface of some Ti64 plasma atomized powder grains promoted the attachment of satellites and growth of envelopes. In case of gas atomized N700 powder grains, we identified thin oxide and carbon amorphous layers as well as metal segregations at the interface between the grain body and the accretionary forms.
ISSN:0005-8912
1613-7531
DOI:10.1007/s00501-020-00958-3