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<p>The influence of low-temperature hydrogen-free nitriding in a&#xa0;glow cyclically switched discharge and with a&#xa0;constant current supply on the microhardness and wear resistance of 40Kh steel was investigated. Nitriding was carried out in a&#xa0;pipe with drilled holes at a&#xa0;certain distance from the ends, in which cylindrical samples of 40Kh steel were placed with a&#xa0;certain tension. The nitriding of the internal surfaces of two types of holes was investigated: a&#xa0;through hole (where the cylinder ends are open) and a&#xa0;blind hole (where one end of the cylinder is closed with a&#xa0;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 cyclically switched discharge, and when saturated with direct current, it decreases and reaches a&#xa0;minimum at the center of the pipe.</p>

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

  • 期刊论文

  • 发表日期：

    2025年11月17日

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  • M. S. Stechyshyn,
  • M. Ye. Skyba,
  • M. V. Kindrachuk,
  • A. V. Martynyuk,
  • D. V. Zdorenko,
  • V. S. Kurskoy,
  • M. V. Luk’yanyuk,
  • A. I. Hordieiev

摘要

The influence of low-temperature hydrogen-free nitriding in a glow cyclically switched discharge 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 (where the cylinder ends are open) and a blind hole (where 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 cyclically switched discharge, and when saturated with direct current, it decreases and reaches a minimum at the center of the pipe.