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Surface functionalization in selective-laser-melted 17-4 PH by plasma polishing and interstitial diffusion hardening
* 1 , 1 , 2 , 2 , 3 , 4 , 1
1  Materials and Surface Engineering, Institute of Materials Science and Engineering, Chemnitz University of Technology, 09107 Chemnitz, Germany
2  Lightweight Structures and Polymer Technology, Chemnitz University of Technology, 09107 Chemnitz, Germany
3  Palacký University in Olomouc, Faculty of Science, Joint Laboratory of Optics of Palacký University and Institute of Physics AS CR, 17. listopadu 12, 771 46 Olomouc, Czech Republic
4  National Institute of R&D for Optoelectronics-INOE2000, Department for Advanced Surface Processing and Analysis by Vacuum Technologies – ReCAST, Magurele - Bucharest, 077125, Romania
Academic Editor: Qi Fan

Abstract:

Developments in processing technology and feedstocks are key drivers for new product innovations in the field of additive manufacturing. In the area of complex and filigree geometries, additive manufacturing technologies are often superior to conventional processes. Selective laser melting (SLM) as a powder bed process allows components of different scales to be manufactured by variation in the grain size range of the feedstocks. However, the surface quality achieved is a critical factor. The powders used as feedstock in the selective laser melting (SLM) process fundamentally limit the surface quality of these components. Particle contamination on the surfaces of the parts can remain rounded or agglomerated, contributing to a very rough surface at the microscale. Furthermore, the manufacturing advantages of a closed component design lead to limitations in the mechanical finishing process, especially regarding undercuts and cavities. In addition to corrosion protection requirements, demands for wear resistance become increasingly important. This study deals with the development of a process chain for the surface functionalization of selective-laser-melted 17-4 PH by plasma polishing and interstitial diffusion hardening. In this context, both the leveling of the surface topography and the development of graded coating properties are of particular interest. In addition, this technology can be used to protect thin films against locally acting forces by providing sufficient support for the substrate materials.

Keywords: selective laser melting, 17-4PH, plasma polishing, interstitial diffusion hardening

 
 
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