a common specification for metal powders suitable for am is the spherical particles produced by gas atomization with a particle size distribution of thickness, typically between 10-50 µm.
material properties such as tensile strength, hardness, and elongation are important for metal am production, and these properties often determine the final material.
in order to achieve the required dimensional accuracy or to improve properties such as surface quality, geometric accuracy, mechanical properties, etc., the components produced by additive manufacturing techniques often require post-processing and finishing.
typical surface roughness values for selective laser melting of metal parts vary from 15 µm to 40 µm (rz in x/y direction).
most physical properties can be enhanced by adding sophisticated manufacturing processes at the end of the am process chain.
high-quality metal products produced using additive manufacturing processes can use a variety of metalworking finishes to meet surface quality and geometry requirements.
after the support structure is removed to separate the part from the build platform, the product can be milled, drilled, polished, etc. internal surfaces, such as those in the internal/tempering channels, can be polished using abrasive flow machining.
heat treatment is often included in various production processes as well as in shot peening to improve the mechanical and surface properties of additively manufactured part surfaces.
another further processing is electropolishing: this electrochemical treatment significantly improves the surface finish of am parts.
its primary goal is to minimize micro-roughness, thereby reducing the risk of dirt or product residue sticking and improving surface cleanliness.
however, electropolishing can also be used for deburring, polishing, and passivation, especially for surfaces exposed to abrasive media.