Journal
ADDITIVE MANUFACTURING
Volume 32, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.addma.2019.101000
Keywords
Austenitic stainless steel; Powder bed fusion; Low-Temperature plasma nitriding; Wear and corrosion behaviour; Dislocation cell structure
Funding
- Slovenian Research Agency [P2-0132, P2-0050]
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Due to the limited wear and corrosion properties of the austenitic stainless steel AISI 316 L, some applications require the benefits of nitriding. The aim of this work was to investigate whether the same positive effect of nitriding could be obtained for 316 L that was additive manufactured using the laser powder-bed fusion process and further solution treated at 1060 degrees C for 30 min, low-temperature plasma nitrided at 430 degrees C or both. This study was designed to better understand the additive-manufactured and solution-treated microstructures as well as developing a nitride and a diffusion layer. The comparison of the wear and corrosion resistance, the microhardness and the microstructure changes of the additive-manufactured steel in different post-treated conditions with a commercial steel was carried out. It was found that the post-treated low-temperature plasma nitriding improves the wear and corrosion resistance of the additive-manufactured samples. The obtained values are similar to the values of conventionally fabricated and nitrided 316 L. The solution treating itself (without further nitriding) did not have any significant impact on these properties. It was possible to explain the microstructure at the nano level as well as correlating the wear and corrosion properties.
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