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Mechanical and corrosion resistant properties of martensitic stainless steel plasma nitrocarburized with rare earths addition |
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| Authors: | LIU Ruiliang QIAO Yingjie YAN Mufu FU Yudong |
| Affiliation: | 1. College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China 2. College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China 3. School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China |
| Abstract: | In order to improve surface hardness and corrosion resistant property of 17-4PH martensitic stainless steel, the steel was plasma nitrocarburized at 560 °C for 2–24 h in a gas mixture of nitrogen, hydrogen and ethanol with rare earths (RE) addition. The experimental results showed that the modified layer was characterized by a compound layer containing two distinct zones (i.e. out ‘dark zone’ and inner ‘white zone’). The inner ‘white zone’ was almost a precipitation free zone and had high hardness as well as good corrosion resistance. Anodic polarization test results showed that the specimens plasma nitrocarburized with RE addition had good corrosion resistance resulted mainly from their higher corrosion potentials, lower corrosion current densities and larger passive regions as compared with those of the untreated one. |
| Keywords: | plasma nitrocarburizing rare earths （RE） microstructure mechanical property corrosion |
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