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How defects depend on geometry and scanning strategy in additively manufactured AlSi10Mg

Englert, Lukas; Czink, Steffen; Dietrich, Stefan; Schulze, Volker

Abstract:
Porosity is an inherent feature of additively manufactured components that impairs the mechanical properties. Since porosity depends not only on the process parameters but also on the component geometry, it is necessary to investigate this dependency. This study reveals relationships between porosity, process parameters and component geometry in AlSi10Mg specimens. Micro-computed tomography images of different geometries built with varying parameters were analysed for pore concentrations. The quantity and distribution of pores at overhangs depends on the laser scan speed and the width of the overhang. Similarly, the scan speed influences the effective bead width and thus the pore formation at thin structures. This relationship is revealed by an in-depth analysis of the laser path together with the μCT images. The investigations show that the process parameters can only be optimal for a specific geometry. The presented interdependencies can be used to derive locally adjusted scanning strategies and machine parameters.


Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Werkstoffkunde (IAM-WK)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 01.2022
Sprache Englisch
Identifikator ISSN: 0924-0136
KITopen-ID: 1000139940
Erschienen in Journal of materials processing technology
Verlag Elsevier
Band 299
Seiten Art.-Nr.: 117331
Schlagwörter Porosity Scan strategy Downskin Selective laser melting Melt pool instability Lack of fusion Powder bed fusion
Nachgewiesen in Scopus
Web of Science
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