Powder quality control is essential to obtain parts with suitable mechanical properties in Selective Laser Melting manufacturing technique. One of the most important advantages of suchtechnique is that it allows an efficient use of the material, due to the possibility to recycle and reuse un-melted powder. Nevertheless, powder material properties may change due to repeated recycling, affecting this way the mechanicalbehavior of parts. In this paper the effect of powder reuse on its quality and on the mechanical properties of the resulting melted parts is studied via self-developed recycling methodology. The material considered for investigation was IN718, a nickel superalloy widely used in industry. After recycling powder up to 14 times, no significant changes were observed in powder and test parts properties. The results obtained in this work will help to validate powder recycling methodology for its use in current industrial Selective Laser Melting manufacturing

The success of a functional coating is intrinsically linked to the improvement of its surface properties, as it is the surface that will be in direct contact with the environment and mechanical stresses when the material is used in severe wear, fatigue, or corrosion applications. It has been shown, for example, by increasing mechanical properties, that factors such as surface hardness increase the durability of the coating/substrate system. Consequently, current research on the design and development of multifunctional coatings for surface engineering within mechanical systems must address surface treatment and modification techniques. This article is a bibliographic review of coatings with industrial applications regarding transition metal nitrides deposited with physical vapor deposition (PVD) techniques such as sputtering and cathodic arc.