Microstructure characterization of recycled IN718 powder and resulting laser clad material
Résumé
The possibility to reuse the metal powder wasted in Laser Material Deposition (LMD) process has been evaluated
and a simple procedure developed. LMD uses metal powder which is fed through a nozzle into the focal point of a
laser, where it melts the powder and the substrate material. During the process, a high ratio of particles hits
against an unmelted area and directly bounces off the deposited area. The efficiency ratio of deposition can drop
to 40% depending on the configuration and spot size. This work deals with the design of a procedure to recollect
and reuse the wasted powder of a nickel based superalloy IN718. After usage, powder is recollected, undesired
fractions are magnetically segregated and aggregates are removed by sieving. The particles are mixed again and
ready for reuse. In order to study the effectiveness of the process, no new powder has been added to the recovered
fraction, and this procedure has been repeated five times. Experimental tests show that deposited
material present similar properties than those obtained with new powder grains. But, after 3 reuses, the porosity
content increases consequently and the rupture strain decreases strongly. The implementation of this process
allows the improvement of the final efficiency, reducing costs and decreasing the hazardous powder amount.
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