Abstract
The microstructure, mechanical properties, etc. of WC-TiN-Co alloy were studied in comparison with those of WC-TiC-Co alloy. The WC-(0-15)mass%TiN (TiC)-10 mass%Co alloys were used as specimens. It was found that the amount of β (WC-TiC S.S) phases formed in the structure was less in the TiN contained alloy under the same addition amount of TiN or TiC, leading to the higher strength and lower hardness in the TiN contained alloy. The thickness of surrounding structure formed on the TiN core became markedly thin, probably owing to the negative affinity between nitrogen and tungsten at elevated temperatures.
