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http://dx.doi.org/10.3740/MRSK.2002.12.7.568

Microstructures and Properties of Surface Hardened Layer on the Plasma Sulfnitrided SKD61 Steel  

Lee, In-Sup (Department of Advanced Material Engineering., Dongeui University)
Park, Chul (Department of Metallurgical Engineering., Pusan National University)
Park, Ik-Min (Department of Metallurgical Engineering., Pusan National University)
Publication Information
Korean Journal of Materials Research / v.12, no.7, 2002 , pp. 568-572 More about this Journal
Abstract
Plasma sulfnitriding technology was employed to harden the surface of SKD61 steel. The plasma sulfnitriding was performed with 3 torr gas pressure at $580^{\circ}C$ for 20 hours. Plasma sulfnitriding resulted in the formation of very thin $2-3\mu\textrm{m}$ FeS sulfide layer on top of $15-20\mu\textrm{m}$ compound layer, which consisted of predominantly $\varepsilon$- $Fe{2-3}$ N and a second phase of $\UpsilonN. In comparision with plasma nitriding treatment, plasma sulfnitriding treatment showed better surface roughness and corrosion resistance due to the presence of the thin FeS layer. which coated microvoids and microcracks on top of the nitrided layer. It was also found that plasma sulfnitrided sample showed better wear resistance due to the presence of the thin FeS layer which acted as a solid lubricant.
Keywords
Plasma sulfnitriding; FeS layer; Surface roughness; Wear properties;
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