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<p>The influence of surface modification of the VT6 titanium alloy with interstitial elements (nitrogen and oxygen) on its tribological behavior under dry sliding in pair with a&#xa0;steel counterbody is investigated. Tests were carried out under a&#xa0;specific load of 1 MPa for 600 s. Diffusion-hardened surface layers were produced by thermochemical treatment. Phase-composition analysis revealed that nitriding (or oxidation) of the VT6 alloy resulted in the formation of titanium nitride (or titanium oxide) at the surface region, accompanied by a&#xa0;pronounced hardness gradient across the modified layer. The friction coefficient of the nitrided VT6 alloy in contact with Cr18Ni10T steel during sliding tests increased progressively, reaching approximately 0.6. This behavior is attributed to sharp asperities on the nitrided surface, which act as micro-cutting edges, removing material from the untreated steel counterbody. In contrast, for the oxidized VT6 alloy, gradual surface lapping at the friction interface reduced the friction coefficient to 0.15–0.2. Moreover, the wear resistance of both nitrided and oxidized layers during reciprocating sliding with steel and ceramic balls improved significantly compared to the untreated alloy, by about a&#xa0;factor of 5 at a&#xa0;specific load of 10 MPa.</p>

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Improvement of the tribological characteristics of VT6 titanium alloy surface layers by diffusion saturation with interstitial elements

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • M. M. Student,
  • I. M. Pohrelyuk,
  • A. G. Luk’yanenko,
  • O. Z. Student,
  • Kh. R. Zadorozhna,
  • V. M. Hvozdetskyi

摘要

The influence of surface modification of the VT6 titanium alloy with interstitial elements (nitrogen and oxygen) on its tribological behavior under dry sliding in pair with a steel counterbody is investigated. Tests were carried out under a specific load of 1 MPa for 600 s. Diffusion-hardened surface layers were produced by thermochemical treatment. Phase-composition analysis revealed that nitriding (or oxidation) of the VT6 alloy resulted in the formation of titanium nitride (or titanium oxide) at the surface region, accompanied by a pronounced hardness gradient across the modified layer. The friction coefficient of the nitrided VT6 alloy in contact with Cr18Ni10T steel during sliding tests increased progressively, reaching approximately 0.6. This behavior is attributed to sharp asperities on the nitrided surface, which act as micro-cutting edges, removing material from the untreated steel counterbody. In contrast, for the oxidized VT6 alloy, gradual surface lapping at the friction interface reduced the friction coefficient to 0.15–0.2. Moreover, the wear resistance of both nitrided and oxidized layers during reciprocating sliding with steel and ceramic balls improved significantly compared to the untreated alloy, by about a factor of 5 at a specific load of 10 MPa.