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        Productivity Enhancement in Directed Energy Deposition: The Oscillating Scanning Strategy Approach

        Alberta Aversa,Alessandro Carrozza,Giulio Marchese,Stefano Felicioni,Michele De Chirico,Mariangela Lombardi,Federica Bondioli,Paolo Fino 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.7

        Directed Energy Deposition (DED) is an additive manufacturing process that enables the production of large metal componentsby melting the feedstock material while being deposited. An improvement of the production speed of this processwould further increase its applicability in many industrial fields. The DED building rate is strictly related to the buildingparameters adopted, in particular to the laser spot diameter, which also affects the build accuracy and the surface quality ofthe components. The possibility of using a variable laser spot would result in a significant increase in the production rate inbulky zones, while also providing a good surface quality where needed. In the present work, an oscillating scanning strategywas used to create a large apparent laser spot (+ 170% of the nominal value) to produce 316L stainless steel samples via DED. The optimisation of the DED parameters with the oscillating strategy was performed using the single scan tracks (SSTs)approach. The morphologies of the SSTs obtained with different process parameters were assessed and the geometrical featuresrelated to the melt pools were analysed in order to select the most suitable X and Z displacements for the production ofthe cubic samples. The analyses of the cubes revealed that, if the correct overlap among nearby scans is selected, it is possibleto obtain dense samples with all the oscillating diameters tested. Finally, comparing the building rate and powder efficiencyvalues confirmed that this method can accelerate the building process and improve its overall performance.

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