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Effect of saturation parameters on the interaction of titanium alloys with carbon-nitrogen-containing media

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Abstract

We study some specific features of phase formation and gas saturation in the course of chemical and thermal treatment of VT1-0, OT4, and VT14 titanium alloys in carbon-nitrogen-containing (graphite and nitrogen under atmospheric pressure) and nitrogen-containing (molecular nitrogen under atmospheric pressure) media. Saturation was carried out at 750–1100°C, and the time of isothermal holding was 5 or 20 h. We have shown that, irrespective of the composition of the saturating medium, within the range 750–1000°C, the phase composition of coatings is identical and consists of TiN and Ti2N nitrides. The quantitative proportions between them depend on the temperature and time of treatment. Owing to the specific features of the composition of a carbon-nitrogen-containing medium, the depth of the diffusion sublayer increases, and the stoichiometry of cubic nitride decreases, which leads to an increase in the surface microhardness of nitride coatings. Carbonitride coatings are formed only at high saturation temperature (1100°C). Their maximum hardness is 2.5 GPa higher than that of nitrides formed under similar conditions.

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Authors and Affiliations

  1. Karpenko Physicomechanical Institute, Ukrainian Academy of Sciences, Lviv

    O. I. Yas’kiv, I. M. Pohrelyuk, V. M. Fedirko & I. V. Dyuh

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  1. O. I. Yas’kiv
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  2. I. M. Pohrelyuk
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  3. V. M. Fedirko
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  4. I. V. Dyuh
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 40, No. 3, pp. 81–87, May–June, 2004.

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Yas’kiv, O.I., Pohrelyuk, I.M., Fedirko, V.M. et al. Effect of saturation parameters on the interaction of titanium alloys with carbon-nitrogen-containing media. Mater Sci 40, 391–398 (2004). https://doi.org/10.1007/PL00022003

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  • DOI: https://doi.org/10.1007/PL00022003

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