Influence of carbon on the structure and properties of TiC-WC-TaC-Co sintered carbides
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Specimens of TT7K12 alloy with a combined carbon content of 0.92–0.97 and of TT20K9 alloy of 0.91–0.95 of stoichiometric have a WC+(Ti, W, Ta)C+Co three-phase structure. The width of the WC+(Ti, W, Ta)C+Co three-phase area is 0.26-0.25% C. With a reduction in carbon content the grain size of the WC and (Ti, W, Ta)C phases decreases.
An increase in carbon content in the alloy within the limits of the area of three-phase equilibrium leads to a decrease in the lattice parameter of the cobalt phase caused by the decrease in the content of tungsten and titanium dissolved in it, which corresponds to the results of earlier investigations of the WC-Co, TiC-WC-Co, and TiC-WC-TaC-Co systems.
Alloys with a combined carbon content of 0.92–0.95 of stoichiometric possess the best combination of properties with the maximum coefficient of life and high bend strength.
KeywordsGrain Size Titanium Carbide Cobalt Tungsten
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