플라즈마 침류질화처리된 SKD61강의 표면경화층의 미세조직과 특성

이인섭; 박철; 박익민; In Sup Lee; Chul Park; Ik Min Park

Korean Journal of Materials Research, Vol.12, No.7, 568-572, July, 2002

DOI10.3740/MRSK.2002.12.7.568 Export Citation

플라즈마 침류질화처리된 SKD61강의 표면경화층의 미세조직과 특성

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

이인섭^†, 박철¹, 박익민¹

동의대학교 신소재공학과
¹부산대학교 금속공학과

In Sup Lee^†, Chul Park¹, and Ik Min Park¹

Department of Advanced Material Engineering, Dongeui University, Busan 614-714, Korea
¹Department of Metallurgical Engineering, Pusan National University, Busan 609-735, Korea

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Plasma sulfnitriding technology was employed to harden the surface of SKD61 steel. The plasma sulfnitriding was performed with 3 torr gas pressure at 580 ? C for 20 hours. Plasma sulfnitriding resulted in the formation of very thin 2?3μm FeS sulfide layer on top of 15?20μm compound layer, which consisted of predominantly ε - Fe2?3 N and a second phase of Υ ′ ?Fe 4 N. 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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