Assessment of the Ti-W-C System and Calculations in the Ti-W-C-N System

The Ti-W-C system is assessed and the phase diagram is presented through various sections and projections. In general, good agreement is obtained between calculations and experiments. The TiC-TiN-WN-WC section is calculated at graphite saturation in the quaternary Ti-W-C-N system. The calculated miscibility gap in fcc is metastable in agreement with experimental observations. The calculated WC solubility and isoactivity lines of N in fcc compares favourably with some experimental information. Finally, the underlying W-C-N system is predicted by calculations.