Structure changes in WC contained TiC-TiN-Co-Ni cermets by annealing

The two-phase TiC--34 vol.% TiN--(7-14) vol.% WC--7 vol.% Ni alloys with different carbon contents were sintered in vacuum at 1500 deg C for 1 h, cooled to room temperature and then annealed at temperatures from 950-1250 deg C. It was found that the two-phase region of each alloy became narrower by the annealing, because of the precipitation of eta or WC phases. The strength and cutting performance of the alloys affected by the annealing were examined. The reason why the alloys of as sintered state were not stable was discussed in detail. Graphs, Photomicrographs, Diffraction patterns. 4 ref.--AA