Lasers are one of the most influential inventions of the twentieth century because of their extraordinary characteristics of high brightness, high directionality, high coherence, high monochromaticity, and unique spatial and temporal distributions. Material processing by laser beams has been well established as an advanced manufacturing technology.
A high-power laser beam can be focused to a power density up to 10-12 W/cm2. These unique features provide excellent manufacturing capabilities with high accuracy, high quality, high efficiency, non-contact processing, high controllability, and ease of automation.
Laser material processing covers a large variety of processing technologies and research areas, including...
- laser matter interaction
- laser surface modification (laser transformation hardening, laser remelting, laser alloying, laser cladding, laser shock peening, laser cleaning, laser texturing, and laser glazing)
- laser welding
- laser cutting and drilling
- laser forming and manufacturing
- industrial applications.
One of the process in which we are interested is the laser cladding which is a process whereby a new layer of material is deposited on a substrate by laser fusion of blown powders or pre-placed powder coatings. Multiple layers can be deposited to form shapes with complex geometry. The use of in-situ synchrotron X-ray diffraction during cladding process enables us to follow the evolution of the microstructure and phases as function of the cladding parameters like...
- laser power density
- beam spot size
- traverse speed
- power flow rate
- laser beam absorption.
Cladding materials are had facing allows powders (Co-based, Ni-based and Fe-based plus various carbides, those of the substrates are cast iron, mild steel, alloyed steel, non-ferrous metals and son) the working principle of the laser surface treatments which involves the absorption and then heat conduction:
Laser Treatments process