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Plasma Post Oxidation of Plasma Nitrocarburized SKD 61 Steel 被引量:2

Plasma Post Oxidation of Plasma Nitrocarburized SKD 61 Steel
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摘要 Plasma nitrocarburizing and plasma oxidizing treatments were performed to improve the wear and corrosion resistance of SKD 61 steel.Plasma nitrocarburizing was conducted for 12 h at 540℃in the nitrogen, hydrogen and methane atmosphere to produce theε-Fe-(2-3)(N,C) phase.The compound layer produced by plasma nitrocarburising was predominantly composed ofε-phase,with a small proportion ofγ′-Fe-4 (N,C) phase. The thickness of the compound layer and the diffusion layer are about 10μm and about 200μm,respectively. Plasma post oxidation was performed on the nitrocarburized samples with various oxygen/hydrogen ratio at constant temperature of 500℃for 1 h.The very thin magnetite (Fe-3O-4) layer of 1-2μm in thickness on top of the compound layer was obtained.Anodic polarization test revealed that plasma nitrocarburizing process contributed a significant improvement of corrosion resistance of SKD 61 steel.However,the corrosion characteristics of the nitrocarburized compound layer was deteriorated by oxidation treatment. Plasma nitrocarburizing and plasma oxidizing treatments were performed to improve the wear and corrosion resistance of SKD 61 steel.Plasma nitrocarburizing was conducted for 12 h at 540℃in the nitrogen, hydrogen and methane atmosphere to produce theε-Fe-(2-3)(N,C) phase.The compound layer produced by plasma nitrocarburising was predominantly composed ofε-phase,with a small proportion ofγ′-Fe-4 (N,C) phase. The thickness of the compound layer and the diffusion layer are about 10μm and about 200μm,respectively. Plasma post oxidation was performed on the nitrocarburized samples with various oxygen/hydrogen ratio at constant temperature of 500℃for 1 h.The very thin magnetite (Fe-3O-4) layer of 1-2μm in thickness on top of the compound layer was obtained.Anodic polarization test revealed that plasma nitrocarburizing process contributed a significant improvement of corrosion resistance of SKD 61 steel.However,the corrosion characteristics of the nitrocarburized compound layer was deteriorated by oxidation treatment.
出处 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2008年第1期136-138,共3页 材料科学技术(英文版)
关键词 Plasma nitrocarburizing Post oxidation ε-Fe2-3(N C) γ′-Fe4(N C) Fe3O4 Plasma nitrocarburizing Post oxidation ε-Fe2-3(N,C) γ′-Fe4(N,C) Fe3O4
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  • 1[1]T.Bell,Y.Sun and A.Suhadi:Vacuum,2000,59,14.
  • 2[2]S.Hoppe:Surf.Coat.Technol.,1998,98,1199.
  • 3[3]Insup Lee:Surf.Coat.Technol.,2004,188-198,66.

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