Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering

Authors

  • Dorina Kovács Budapest University of Technology and Economics https://orcid.org/0000-0001-6555-9057
  • Dávid Miklós Kemény Budapest University of Technology and Economics, Department of Materials Science and Engineering

DOI:

https://doi.org/10.36547/ams.27.4.1172

Keywords:

additive manufacturing, DMLS, plasma nitriding, corrosion rate, austenitic stainless steel

Abstract

A special additive manufacturing (AM), called as Direct Metal Laser Sintering (DMLS), is a technology that produces 3D workpieces using a wide range of different metals as raw materials. The aim of current research is to investigate the plasma nitriding effect on the DMLS produced samples. The direct current plasma nitriding treatment was achieved at 440 °C for 4 hours with 75%N2 – 25%H2 gas mixture. Before the treatment, the 316L austenitic stainless steels samples were ground with different methods to modify the surface roughness. Scanning electron microscope (SEM), X-ray diffractometer, glow discharge optical electron spectroscopy, Vickers microhardness tester and potentiodynamic corrosion test were used for the characterization of surface properties. The results demonstrated that the surface roughness did not affect the outcome of the plasma nitriding, but the corrosion resistance increases with the decrease of the surface roughness compared to the untreated 3D sample.

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Published

2021-12-07

How to Cite

Kovács, D., & Kemény, D. M. (2021). Effect of plasma nitriding of austenitic stainless steel produced by direct metal laser sintering. Acta Metallurgica Slovaca, 27(4), 190–194. https://doi.org/10.36547/ams.27.4.1172