Surface Properties of Fe4N Compounds Layer on AISI 4340 Steel Modified by Pulsed Plasma Nitriding
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2013年第3期
论文作者：J.C.Díaz-Guillén
文章页码：287 - 290
摘 要：<正>In this work,the effect of nitriding current density on hardness,crystalline phase composition,layer thickness and corrosion rate of AISI 4340 steel has been studied.X-ray diffraction analysis shows that thin layers formed during nitriding process are constituted of y-Fe4N for samples processed between 1 and 2.5 mA/cm2. Thickness of nitrided layer increases proportionally to current density（0μm for 0.5 mA/cm2 to 1 5μm for 2.5 mA/cm2）.Plasma nitriding increased the surface hardness from 300 HV50g for untreated sample,to around 800HV50g for nitrided samples at 1 mA/cm2.While the untreated samples exhibited a corrosion rate of 0.153 mm per year,the corrosion performance was improved up to 0.03 mm per year at current densities above 1 mA/cm2,which is about one fifth of the corrosion rate of the untreated sample.
J.C.Díaz-Guillén1,2
摘 要：<正>In this work,the effect of nitriding current density on hardness,crystalline phase composition,layer thickness and corrosion rate of AISI 4340 steel has been studied.X-ray diffraction analysis shows that thin layers formed during nitriding process are constituted of y-Fe4N for samples processed between 1 and 2.5 mA/cm2. Thickness of nitrided layer increases proportionally to current density（0μm for 0.5 mA/cm2 to 1 5μm for 2.5 mA/cm2）.Plasma nitriding increased the surface hardness from 300 HV50g for untreated sample,to around 800HV50g for nitrided samples at 1 mA/cm2.While the untreated samples exhibited a corrosion rate of 0.153 mm per year,the corrosion performance was improved up to 0.03 mm per year at current densities above 1 mA/cm2,which is about one fifth of the corrosion rate of the untreated sample.
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