Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Ex-situ and In-situ Microstructure Investigations of AM Part and Powders

Version 1 : Received: 29 January 2021 / Approved: 29 January 2021 / Online: 29 January 2021 (17:21:56 CET)

How to cite: Albu, M.; Mitsche, S.; Nachtnebel, M.; Krisper, R.; Dienstleder, M.; Kothleitner, H.; Kothleitner, G. Ex-situ and In-situ Microstructure Investigations of AM Part and Powders. Preprints 2021, 2021010635 (doi: 10.20944/preprints202101.0635.v1). Albu, M.; Mitsche, S.; Nachtnebel, M.; Krisper, R.; Dienstleder, M.; Kothleitner, H.; Kothleitner, G. Ex-situ and In-situ Microstructure Investigations of AM Part and Powders. Preprints 2021, 2021010635 (doi: 10.20944/preprints202101.0635.v1).

Abstract

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, suggestinga 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.

Subject Areas

Powder; AlSiMg; Ti64; N700; microstructure; high-resolution electron microscopy

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