Abstract
The short-time (<2 hr) creep-rupture strength of WC-TiC-TaC-Co alloys was studied mainly at 900-1000°C as a function of composition of WC-TiC-TaC triple carbide (βt). It was found that the creep-rupture strength of βt-Co and WC-βt-Co alloys increased with decreasing TaC content in βt, that is, steady-state creep rate dropped and the formation of stable microcracks was retarded. It was suggested that the creeprupture strength of those alloys was largely affected by βt/βt interface-strength which increased with decreasing TaC content.
