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Journal of Materials Engineering and Performance

Published in:

20-06-2018

Control of Carbon Content in Ultrafine Cemented Carbide by Heat Treatment in Reducing Atmospheres Containing Carbon Oxides

Authors: M. I. Dvornik, E. A. Mikhaylenko

Published in: Journal of Materials Engineering and Performance | Issue 7/2018

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Abstract

In this work, the method of control of carbon content in the ultrafine-grained cemented carbide alloy was proposed. The treating of the WC-8Co-0.4VC-0.4Cr₃C₂ compacts was made in a CO + CO₂ gas mixture at CO concentrations from 0 to 80 vol.% during 50 min at the initial stage of the conventional sintering at a temperature of 700 °C. Conditions for increasing and decreasing the carbon content are CO concentrations of CO in gas mix more than 65 vol.% and less than 35 vol.%, respectively. It is shown that even a small deviation from the stoichiometric carbon content (0.3 wt.%) leads to an increase in porosity and a multiple decrease in the strength of the ultrafine-grained cemented carbide. A comparative analysis with literature data showed that the obtained ultrafine-grained solid alloy WC-8Co-0.4VC-0.4Cr₃C₂ with stoichiometric composition is not inferior in hardness and toughness to the analogs obtained by hot pressing and electrospark sintering.

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Title: Control of Carbon Content in Ultrafine Cemented Carbide by Heat Treatment in Reducing Atmospheres Containing Carbon Oxides
Authors: M. I. Dvornik
E. A. Mikhaylenko
Publication date: 20-06-2018
Publisher: Springer US
Published in: Journal of Materials Engineering and Performance / Issue 7/2018
Print ISSN: 1059-9495
Electronic ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-018-3460-1

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