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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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Todd, Iain
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Topics
Publications (15/15 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 grain structure in metallic additive manufacturing using a versatile, inexpensive process control systemcitations
- 2023In situ TiC reinforced Ti6Al4V matrix composites manufactured via selective laser meltingcitations
- 2023Controlling grain structure in metallic additive manufacturing using a simple, inexpensive process control system
- 2019Exploiting thermal strain to achieve an in-situ magnetically graded materialcitations
- 2019Influence of solidification cell structure on the martensitic transformation in additively manufactured steelscitations
- 2017Atomic structure of Mg-based metallic glasses from molecular dynamics and neutron diffraction
- 2017Atomic structure of Mg-based metallic glasses from molecular dynamics and neutron diffractioncitations
- 2016On the use of cryomilling and spark plasma sintering to achieve high strength in a magnesium alloycitations
- 2016The Effectiveness of Hot Isostatic Pressing for Closing Porosity in Titanium Parts Manufactured by Selective Electron Beam Meltingcitations
- 2015New compositional design for creating tough metallic glass composites with excellent work hardeningcitations
- 2009Effect of phosphorus and strontium additions on formation temperature and nucleation density of primary silicon in Al-19 Wt Pct Si alloy and their effect on eutectic temperaturecitations
- 2006The Effect of Casting Variables on the Structure of Hypereutectic Al-Si Alloyscitations
- 2006Directly quenched bulk nanocrystalline (Pr, Dy)-(Fe, Co)-B-Zr-Ti hard magnetscitations
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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.