Journal Published Online: 14 February 2020
Volume 9, Issue 1

Classification of Defect Types in SLM Ti-6Al-V4 by X-ray Refraction Topography

CODEN: MPCACD

Abstract

Porosity in additively manufactured materials, such as laser powder bed fusion Ti-Al6-V4, can play an important role in their mechanical performance. Not only the total porosity but also the shape/morphology of the individual pores need to be considered. Therefore, it is necessary to determine the distributions of different defect types (especially fusing defects and keyhole pores) and their dependence on process parameters. We show that synchrotron X-ray refraction radiography allows analysis of large samples (up to several millimeters) without compromising the detectability of submicrometer defects. Correspondingly, a classification tool is introduced that is able to quantitatively distinguish defects such as keyhole pores and binding defects with a confidence level of 94 %, even when the shape cannot be discerned because of limited spatial resolution.

Author Information

Laquai, René
Division 8.5 Micro-NDE, Federal Institute for Materials Research and Testing, Berlin, Germany
Müller, Bernd Randolf
Division 8.5 Micro-NDE, Federal Institute for Materials Research and Testing, Berlin, Germany
Kasperovich, Galina
Institute of Materials Research, German Aerospace Center, Cologne, Germany
Requena, Guillermo
Institute of Materials Research, German Aerospace Center, Cologne, Germany
Haubrich, Jan
Institute of Materials Research, German Aerospace Center, Cologne, Germany
Bruno, Giovanni
Division 8.5 Micro-NDE, Federal Institute for Materials Research and Testing, Berlin, Germany Institute for Physics and Astronomy, University of Potsdam, Potsdam, Germany
Pages: 12
Price: $25.00
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Stock #: MPC20190080
ISSN: 2379-1365
DOI: 10.1520/MPC20190080