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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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Peyre, P.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2017Laser offset welding of AZ31B magnesium alloy to 316 stainless steelcitations
- 2016Laser offset welding of AZ31B magnesium alloy to 316 stainless steelcitations
- 2012Surface Finish Issues after Direct Metal Deposition
- 2009Direct fabrication of a Ti-47Al-2Cr-2Nb ally by selective laser melting and direct metal deposition processescitations
- 2008Analytical and numerical modelling of the direct metal deposition laser processcitations
- 2008Galvanised steel to aluminium joining by laser and GTAW processes,citations
- 2008Galvanised steel to aluminium joining by laser and GTAW processescitations
- 2007Steel to aluminium joining by laser and TIG reactive wettingcitations
- 2007Generation of aluminum-steel joints with laser-induced reactive wettingcitations
- 2006Which laser process for steel to aluminium joining ?
- 2005Steel to aluminium brazing by laser and TIP processes
Places of action
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article
Surface Finish Issues after Direct Metal Deposition
Abstract
Derived from laser cladding, the Direct Metal Deposition (DMD) laser process, is based upon a laser beam - projected powder interaction, and allows manufacturing complex 3D shapes much faster than conventional processes. However, the surface finish remains critical, and DMD parts usually necessitate post-machining steps. In this context, the focus of our work was: (1) to understand the physical mechanisms responsible for deleterious surface finishes, (2) to propose different experimental solutions for improving surface finish. Our experimental approach is based upon: (1) adequate modifications of the DMD conditions (gas shielding, laser conditions, coaxial or off-axis nozzles), (2) a characterization of laser-powder-melt-pool interactions using fast camera analysis, (3) a precise check of surface aspects using 3D profilometry, SEM, (4) preliminary thermo-convective simulations to understand melt-pool hydrodynamics. Most of the experimental tests were carried out on a Ti6Al4V titanium alloy, widely investigated already. Results confirm that surface degradation depends on two aspects: the sticking of non-melted or partially melted particles on the free surfaces, and the formation of menisci with more or less pronounced curvature radii. Among other aspects, a reduction of layer thickness and an increase of melt-pool volumes to favor re-melting processes are shown to have a beneficial effect on roughness parameters.