Gas Nitriding of the Near-Beta-Titanium Alloy

Authors

  • A.G. Luk’yanenko G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine https://orcid.org/0000-0001-6642-2300
  • I.M. Pohrelyuk G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine https://orcid.org/0000-0002-3009-2829
  • V.M. Fedirko G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine https://orcid.org/0000-0002-4337-1691
  • A.G. Molyar G.V. Kurdyumov Institute for Metal Physics of the NAS of Ukraine, Department of Physics of Strength and Ductility of Inhomogeneous Alloys,36 Academician Vernadsky Boulevard, 03142 Kyiv, Ukraine
  • V.S. Trush G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine https://orcid.org/0000-0002-2264-3918
  • T.M. Kravchyshyn G.V. Karpenko Physico-Mechanics Institute of the NAS of Ukraine, Department of Material Science Bases of Surface Engineering, 5, Naukova Str., 79060 Lviv, Ukraine

DOI:

https://doi.org/10.24425/amm.2023.142419

Abstract

The present research investigates the nitriding kinetics of the near-beta-titanium alloy of Ti-Al-Nb-Fe-Zr-Mo-V system at 750, 800, and 850°C in gaseous nitrogen at 10 5 Pa for 2, 4, and 8 h. The parabolic coefficient kp of the layer’s growth rate and the nitriding activation energy E are set as the kinetic parameters of the nitrided layer’s growth. The activation energy for the formation of a nitride layer is ~108 kJ/mol. The authors discuss the morphology of the nitride layers as well as their roughness and surface hardness. The study determines the effective diffusion coefficient for the growth of diffusion layers in the temperature range of 750...850°C: Def = D0 × exp (– E/RT), where D0 = 0.0177 m 2/s; E = 215.7 kJ/mol. The friction coefficient of the disk from near-beta-titanium alloy with a bronze block is lowered by significantly more than 10 times after gas nitriding, and the temperature in the friction zone is reduced by 2.5 times.

Published

2023-06-06

How to Cite

Luk’yanenko, A.G., et al. “Gas Nitriding of the Near-Beta-Titanium Alloy”. Archives of Metallurgy and Materials, vol. 68, no. 2, June 2023, doi:10.24425/amm.2023.142419.

Issue

Vol. 68 No. 2 (2023)

Section

Articles