| METALS AND METAL MATRIX COMPOSITES |
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| Microstructure and Properties of Composite Modified Layer of Austenitic Stainless Steel Obtained by Nitriding & Physical Vapor Deposition |
| CHEN Zhilin1, CAO Chi1,2, YANG Ruicheng1,2, MU Xinbin1, CHEN Bibi1, HU Qiuchen2
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1 Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of Technology, Wenzhou 325105, China
2 Institute of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract Austenitic stainless steel 316L was ion nitrided by glow plasma penetration and diffusion technique at different temperatures, subsequently, CrN coating was deposited on top of the nitrided layer by physical vapor deposition technology. The adhesion strength, hardness, tribological property and corrosion resistance of the duplex coating were tested. The microstructure and phase constituents were also examined. It has been found that, with the increase of temperature, the microconstituent of the duplex coating gained by plasma nitriding at different temperatures and PVD transfers from S-phase (inner layer)+CrN coating (outer layer) to hard phase precipitated layer of different degree (inner layer)+CrN coa-ting (outer layer). The adhesion strength of different kinds of nitrided layer with CrN coating was good. After PVD treatment, the surface hardness, abrasion resistance and corrosion resistance of nitrided layer was improved to some extent whether it was S-phase or hard phase precipitated layer. With the increase of nitriding temperature, the corrosion resistance deteriorated, the hardness and abrasion resistance were elevated.
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Published: 23 March 2021
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| Fund:Key Research and Development Project of Zhejiang Province (2019C01090), Basic Research Project of Wenzhou (G20180005). |
About author:: Zhilin Chen, received his M.S. degree in materials science from Lanzhou University of Technology in June 2012. He is currently an engineer in Wenzhou Pump and Valve Engineering Research Institute of Lanzhou University of Technology, focusing on the research of surface modification of materials.
Chi Cao, received his Ph.D. degree in 2009 from Lanzhou University of Technology in engineering. He is currently a master tutor in Lanzhou University of Technology, focusing on the research of surface modification of metal materials and material forming technology. |
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2021, Vol. 35 
