Additive generation of surface microstructures for fluid-dynamic applications by using single-mode fibre laser assisted microcladding

A method is presented for surface modification of 3D metallic components, to generate micron-sized features to improve drag and surface interaction with viscous fluids. The technique relays in the selective consolidation of pre-placed powder, directly on the surface of the component, to produce micro-cladding tracks under 50 microns in width. A single mode fibre laser is scanned at high speed on the powder to provide the desired geometry. The requirements and limits of the technique are studied, regarding the laser source, optical setup and powder preplacing methodology, as well as practical aspects for its implementation and some applications. © 2011 Published by Elsevier Ltd.