Funct. Mater. 2025; 32 (2): 211-216.

doi:https://doi.org/10.15407/fm32.02.211

Formation of microstructure and mechanical properties on internal cylindrical surfaces nitrided by ion-plasma method

I.A. Sieliverstov1, I.V. Smirnov2, A.V. Chornyi2, V.V. Lysak2, O.V. Liashko1, M.O. Sysoyev3

1Kherson National Technical University, 24 Beryslavs′ke Hwy., Kherson, 73008, Ukraine
2National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" Beresteisky ave., 37, Kyiv, 03056, Ukraine
3E.O. Paton Electric Welding Institute, National Academy of Sciences of Ukraine, 11, Kazymyr Malevych St., Kyiv, 03150, Ukraine

Abstract: 

The paper studies the processes of active ion-plasma nitriding of the inner surface in the mode of abnormal glow discharge; a hollow cathode and a perforated tubular anode made of widely used high-quality steel 40CrNi2Mo are used. The structure and composition of the nitrided surfaces and the microhardness of the internal surfaces were investigated. The relationship between plasma treatment parameters, geometric features and microhardness has been established. Diffusion coatings with uneven nitrogen concentration and discrete layered structure were obtained. The nitrided surface consists of three zones: nitride, transition and diffusion. The nitrided layers have increased hardness; scratching revealed zones with higher hardness values located along the inner cylindrical surface.

Keywords: 
ion-plasma nitriding, hollow cathode, perforated anode, microhardness, sclerometry, internal cylindrical surfaces.

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