693.932 PEOPLE
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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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Lee, Peter D.
University College London
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (43/43 displayed)
- 2024New insights into the mechanism of ultrasonic atomization for the production of metal powders in additive manufacturingcitations
- 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
- 2024Pore evolution mechanisms during directed energy deposition additive manufacturingcitations
- 2024Pore evolution mechanisms during directed energy deposition additive manufacturing
- 2024Unravelling dynamic recrystallisation in a microalloyed steel during rapid high temperature deformation using synchrotron X-rayscitations
- 2024AM-SegNet for additive manufacturing in situ X-ray image segmentation and feature quantification
- 2024Correlative spatter and vapour depression dynamics during laser powder bed fusion of an Al-Fe-Zr alloycitations
- 2024A closer look at high-energy X-ray-induced bubble formation during soft tissue imaging
- 2023In situ X-ray imaging of hot cracking and porosity during LPBF of Al-2139 with TiB2 additions and varied process parameters
- 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
- 2021Unraveling compacted graphite evolution during solidification of cast iron using in-situ synchrotron X-ray tomographycitations
- 2021Correlative synchrotron X-ray imaging and diffraction of directed energy deposition additive manufacturingcitations
- 2019Effect of preheating on the thermal, microstructural and mechanical properties of selective electron beam melted Ti-6Al-4V componentscitations
- 2018Bouncing and 3D printable hybrids with self-healing propertiescitations
- 2018Direct ink writing of highly bioactive glassescitations
- 2018Revisiting models for spheroidal graphite growthcitations
- 2018Analysis of local conditions on graphite growth and shape during solidification of ductile cast ironcitations
- 2017Atomic Layer Deposition of a Silver Nanolayer on Advanced Titanium Orthopedic Implants Inhibits Bacterial Colonization and Supports Vascularized de Novo Bone Ingrowthcitations
- 2017Investigating the evolving microstructure of lithium metal electrodes in 3D using X-ray computed tomographycitations
- 2017Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scatteringcitations
- 2016High-Density Protein Loading on Hierarchically Porous Layered Double Hydroxide Composites with a Rational Mesostructurecitations
- 2016Elucidation of differential mineralisation on native and regenerated silk matricescitations
- 2016High-Density Protein Loading on Hierarchically Porous Layered Double Hydroxide Composites with a Rational Mesostructure.citations
- 2015Transgranular liquation cracking of grains in the semi-solid state
- 2015Influence of processing conditions on strut structure and compressive properties of cellular lattice structures fabricated by selective laser meltingcitations
- 2014In-operando X-ray tomography study of lithiation induced delamination of Si based anodes for lithium-ion batteriescitations
- 2013A multiscale 3D model of the Vacuum Arc remelting processcitations
- 2012Industrial application of a numerical model to simulate lubrication, mould oscillation, solidification and defect formation during continuous castingcitations
- 2012Review: The "butterfly effect" in continuous castingcitations
- 2012A multi-scale 3D model of the vacuum arc remelting processcitations
- 2010Rare earth oxides as nanoadditives in 3-D nanocomposite scaffolds for bone regenerationcitations
- 2010Explicit modelling of slag infiltration and shell formation during mould oscillation in continuous castingcitations
- 2010A new approach for modelling slag infiltration and solidification in a continuous casting mouldcitations
- 2009Modelling solidification and slag infiltration during the continuous casting of slabs
- 2007Non-destructive quantitative 3D analysis for the optimisation of tissue scaffoldscitations
- 2007Non-destructive quantitative 3D analysis for the optimisation of tissue scaffoldscitations
- 2007The effect of mould flux properties on thermo-mechanical behaviour during billet continuous castingcitations
- 2006Microsegregation quantification for model validation
- 2002Mould powder selection model for continuous casting
Places of action
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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.