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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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Chen, Hao
Politecnico di Milano
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023Study of process parameters and characteristics properties of W coatings deposited by rf plasma sputteringcitations
- 2021Insight into the Solid Electrolyte Interphase Formation in Bis(fluorosulfonyl)Imide Based Ionic Liquid Electrolytescitations
- 2021Powder Bed Fusion of nickel-based superalloys: A reviewcitations
- 2021Near-IR transparent conductive amorphous tungsten oxide thin layers by non-reactive radio-frequency magnetron sputteringcitations
- 2020‘Unit cell’ type scan strategies for powder bed fusioncitations
- 2020Unveiling the Working Mechanism of Graphene Bubble Film/Silicon Composite Anodes in Li-Ion Batteries: From Experiment to Modelingcitations
- 2018Utilizing room temperature liquid metals for mechanically robust silicon anodes in lithium-ion batteriescitations
- 2013The effect of prior ferrite formation on bainite and martensite transformation kinetics in advanced high-strength steelscitations
- 2013Application of interrupted cooling experiments to study the mechanism of bainitic ferrite formation in steelscitations
- 2012Analysis of the stagnant stage in diffusional phase transformations starting from austenite-ferrite mixturescitations
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article
‘Unit cell’ type scan strategies for powder bed fusion
Abstract
<p>In this study, the melt pool (MP) morphology evolution (solidification) in a Hilbert fractal pattern for the Powder-Bed Fusion Additive Manufacturing (PBF-AM) of Alloy 718 is examined by devising a 'Unit Cell' Methodology (UCM). Since scan strategies are becoming an increasingly important method for managing morphological, microstructural phenomena, and thermally induced stresses, new scan strategies are a requirement. The methodology described here involves defining a 'unit cell' from the larger (higher-order) Hilbert fractal curve and then printing the constitutive lines (vectors) of the 'unit Hilbert cell' and visualising its morphological evolution over a single layer. Process parameters (line length of the 'unit cell,' laser power, and laser speed) variations are performed to analyse its effects on the morphology of the 'unit Hilbert cell' (single layer). The higher-order Hilbert fractal curve is then demonstrated in stages to explain the morphological evolution. The observed coalesced MP propagates over the surface in the larger (higher-order) Hilbert fractal curve, according to the position of the 'unit cells' in the Hilbert fractal curve. The flow of a coalesced MP in PBF-AM using the short vector lengths at a lower linear energy density and three times the width of parallel-line single-track MPs is demonstrated for the first time with the Hilbert fractal. Process parameter variation on the 'unit Hilbert cell' results in MP morphology (dimensions and shape) changes. These variations help to choose the required coalesced MP dimensions in the higher-order Hilbert fractal and ensure good hatching with the adjacent 'unit cell' MPs as it propagates. The proposed methodology could be expanded to allow an understanding of the morphology evolution of other fractal curves in the PBF-AM process.</p>