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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Atwood, Robert C.
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Topics
Publications (11/11 displayed)
- 2024An in situ imaging investigation of the effect of gas flow rates on directed energy depositioncitations
- 2024An in situ imaging investigation of the effect of gas flow rates on directed energy depositioncitations
- 2023Controlling solute channel formation using magnetic fields
- 2023In situ correlative observation of humping-induced cracking in directed energy deposition of nickel-based superalloys
- 2022Quantification of Interdependent Dynamics during Laser Additive Manufacturing Using X-Ray Imaging Informed Multi-Physics and Multiphase Simulation
- 2021Oxidation induced mechanisms during directed energy deposition additive manufactured titanium alloy buildscitations
- 2021Correlative synchrotron X-ray imaging and diffraction of directed energy deposition additive manufacturingcitations
- 2019Combined deformation and solidification-driven porosity formation in aluminum alloyscitations
- 2015Transgranular liquation cracking of grains in the semi-solid state
- 2007Non-destructive quantitative 3D analysis for the optimisation of tissue scaffoldscitations
- 2007Non-destructive quantitative 3D analysis for the optimisation of tissue scaffoldscitations
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article
An in situ imaging investigation of the effect of gas flow rates on directed energy deposition
Abstract
Gas flow rates in Directed Energy Deposition (DED) Additive Manufacturing (AM) can significantly affect the quality of built parts by altering melt pool geometry. Using a DED process replicator and in situ synchrotron radiography, together with analogous experiments in an industrial DED machine, we investigate the impact of carrier gas and shield gas flow rates on build quality. The results reveal that there is a critical shield gas flow rate above which melt pools are flattened, tracks widen, and thus layer thickness decreases. The reduction in layer thickness is most prominent in conditions with low carrier gas flow rate, as the highly turbulent shield gas flow may divert slow moving powder particles away from the melt pool, decreasing capture efficiency. Very high flow rates increase internal porosity, as fast-moving particles impacting the melt pool surface can entrain chamber gas behind them. High gas flow rates also cool the melt pool, creating shallower melt pools with increased thermal gradients near the solidification front, increasing pore entrapment in the solidified track.