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<p>The paper presents the results of a comprehensive study of the effect of vacuum ion-plasma thermocyclic modified nitriding (IPTMN) modes on the formation of a strengthened surface layer and the operational properties of tubular structural elements made of high-strength alloy steel 40KhN2MA. A comparative analysis of two IPTMN modes (CTT-2 and CTT-3) was carried out using various diagnostic methods. Metallographic studies conducted on an AXIOVERT 40MAT inverted optical microscope revealed significant differences in the structure of the modified layers. The CTT-3 mode ensured the formation of a higher quality and more uniform hardened layer in terms of thickness. Durometric measurements of microhardness HV<sub>0.1</sub> on the PMT-3 device showed the advantage of the CTT-3 mode, which is confirmed by higher hardness values in the treatment zone. Climatic tests in salt fog conditions (5% NaCl solution, 72 hours) demonstrated higher corrosion resistance of specimens treated with the CTT-3 mode. Comprehensive dynamic tests on the PK-30 gas-air bench confirmed the ability of the modified layer to effectively resist wear, as evidenced by minimal changes in the inner diameter of the tubular specimens after simulation of operational loads. The results obtained are of great practical importance for the development of methods for surface strengthening of critical structural elements operating under combined mechanical loads and aggressive environments. The proposed IPTMN technology mode can be recommended for industrial application to increase the service life of 40KhN2MA steel tubular structures in the defense, aerospace, and other industries.</p>

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Application of Vacuum Ion-plasma Thermo-cyclic Modified Nitriding Technology to Increase the Wear Resistance of a Tubular Element of a Structure Made of 40KhN2МА Steel: Assessment of the Influence of Surface Layer Modification Modes

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • P. O. Bulakh,
  • V. E. Danylyuk,
  • A. V. Rutkovskyi,
  • V. P. Shvets,
  • E. O. Kondryakov,
  • A. A. Kotlyarenko,
  • O. E. Gopkalo

摘要

The paper presents the results of a comprehensive study of the effect of vacuum ion-plasma thermocyclic modified nitriding (IPTMN) modes on the formation of a strengthened surface layer and the operational properties of tubular structural elements made of high-strength alloy steel 40KhN2MA. A comparative analysis of two IPTMN modes (CTT-2 and CTT-3) was carried out using various diagnostic methods. Metallographic studies conducted on an AXIOVERT 40MAT inverted optical microscope revealed significant differences in the structure of the modified layers. The CTT-3 mode ensured the formation of a higher quality and more uniform hardened layer in terms of thickness. Durometric measurements of microhardness HV0.1 on the PMT-3 device showed the advantage of the CTT-3 mode, which is confirmed by higher hardness values in the treatment zone. Climatic tests in salt fog conditions (5% NaCl solution, 72 hours) demonstrated higher corrosion resistance of specimens treated with the CTT-3 mode. Comprehensive dynamic tests on the PK-30 gas-air bench confirmed the ability of the modified layer to effectively resist wear, as evidenced by minimal changes in the inner diameter of the tubular specimens after simulation of operational loads. The results obtained are of great practical importance for the development of methods for surface strengthening of critical structural elements operating under combined mechanical loads and aggressive environments. The proposed IPTMN technology mode can be recommended for industrial application to increase the service life of 40KhN2MA steel tubular structures in the defense, aerospace, and other industries.