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In situ 3D X-ray microtomography of laser-based powder-bed fusion (L-PBF) - A feasibility study

Abstract : X-ray microtomography can be used to characterise objects undergoing fabrication by additive manufacturing. During the layer-by-layer building process, it can provide key information about geometry, roughness and it can even reveal typical defects such as lack-of-fusion porosity, gas pores or cracks. Usually, objects are built with varied processing parameters and then characterised post-mortem. In the present work, we describe our custom-designed additive manufacturing chamber allowing in situ 3D-non-destructive characterisation to be performed during layer-by-layer construction using synchrotron X-ray microtomography. Scans before (subsequently to powder deposition) and after local laser melting are acquired for every layer. A few examples of such a characterisation demonstrate the ability of the setup to reproduce conditions close to those used in conventional laser powder-bed fusion devices and to reveal key phenomena.
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Submitted on : Wednesday, April 29, 2020 - 2:58:18 PM
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Pierre Lhuissier, Xavier Bataillon, Camille Maestre, Julien Sijobert, Elodie Cabrol, et al.. In situ 3D X-ray microtomography of laser-based powder-bed fusion (L-PBF) - A feasibility study. Additive Manufacturing, Elsevier, In press. ⟨hal-02558318⟩

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