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The Distribution of Carbon in a Tungsten–Cobalt Alloy during Heat Treatment in a Gaseous Medium of Carbon Oxides

  • CHEMISTRY AND TECHNOLOGY OF RARE, TRACE, AND RADIOACTIVE ELEMENTS
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Abstract

Investigations of composition, structure, and hardness of ultrafine-grained solid alloy WC–8Co–0.4VC–0.4Cr3C2 after treatment in a gaseous mixture of CO + CO2 of compacts with a lack of carbon for 50 min at a temperature 650°C on the initial stage of liquid-phase sintering. It was found that at CO content of 72.5% in the gas mixture, conditions are created for replacing the initial carbon deficiency (about 0.3%) and obtaining two-phase ultrafine-grained carbide of stoichiometric composition, in which carbon and hardness are uniformly distributed over the depth of the samples. This alloy has the lowest porosity (2.5%) and the highest hardness (HV1941). It was found that an increase of up to 80% or a decrease of up to 0% of the CO content in a gas mixture leads to the formation of a lack of carbon (1.0%) or an excess of carbon (4.5%) on the surface of the samples. This leads to a significant decrease in hardness. It is shown that the change in the carbon content and hardness in the depth of the samples is much less than on the surface.

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ACKNOWLEDGMENTS

The images on the scanning electron microscope were obtained in the Far Eastern Center of Electron Microscopy on the basis of the IBM FEB, Russian Academy of Sciences.

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Authors and Affiliations

  1. Institute of Materials Science, Khabarovsk Scientific Center, Far Eastern Branch, Russian Academy of Sciences, 680042, Khabarovsk, Russia

    M. I. Dvornik, A. V. Zaitsev & E. A. Mikhailenko

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  1. M. I. Dvornik
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  2. A. V. Zaitsev
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  3. E. A. Mikhailenko
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Correspondence to A. V. Zaitsev.

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Translated by A. Bannov

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Dvornik, M.I., Zaitsev, A.V. & Mikhailenko, E.A. The Distribution of Carbon in a Tungsten–Cobalt Alloy during Heat Treatment in a Gaseous Medium of Carbon Oxides. Theor Found Chem Eng 53, 916–920 (2019). https://doi.org/10.1134/S0040579518050081

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