The influence of hydrogen-free glow discharge nitriding of 40Kh steel on the properties of the surface layer in long holes

Keywords

nitriding, cyclically switched discharge, steel 40Kh, microhardness, long holes.

Cite as

Stechyshyn М. S., Skyba М. Ye., Kindrachuk М. V., Martynyuk А. V., Zdorenko D. V., Kurskoy V. S., Luk’yanyuk М. V., and Hordieiev А. І. The influence of hydrogen-free glow discharge nitriding of 40Kh steel on the properties of the surface layer in long holes. Physicochemical Mechanics of Materials. 2025. 61(3), 055-060.

https://doi.org/10.15407/pcmm2025.03.055

Abstract

The influence of low-temperature hydrogen-free nitriding in a glow cyclically switched discharge (CSD) and with a constant current supply on the microhardness and wear resistance of 40Kh steel was investigated. Nitriding was carried out in a pipe with drilled holes at a certain distance from the ends, in which cylindrical samples of 40Kh steel were placed with a certain tension. The nitriding of the internal surfaces of two types of holes was investigated: a through hole (the cylinder ends are open) and a blind hole (one end of the cylinder is closed with a lid). It is found that regardless of the distance from the end of the pipe, the surface microhardness of the end samples on its inner side remains constant during nitriding with the CSD, and when saturated with direct current, it decreases and reaches a minimum at the center of the pipe.

 

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