Abstract
Some properties of WC-15%Co alloy were studied as a function of additional amounts of Cr3C2, and carbon contents of the alloy.It was found that solid solubility limits of Cr in binder were about 4 and 11% in high and low carbon alloys, respectively. When the additional amount of Cr3C2 was excess beyond the solubility limit of Cr, M7C3 type carbides which crystallized were observed in the structure. Total amounts of Co and W dissolved in M7C3 increased in high carbon alloy, and the amount of M7C3 was in the same way under a fixed amount of Cr3C2. The transverse-rupture strength of the alloy was not almost affected by Cr3C2 addition, within the additional amount up to the value nearly corresponding to the solubility limit of Cr in binder. The solubility limit of Cr increased by rapid cooling the specimen after sintering.
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