| 摘要 |
A cermet tool that has excellent thermal crack resistance, while maintaining plastic deformation resistance, wear resistance and a long service life even when it is used for intermittent cutting is disclosed. The cermet tool comprises Ni or Ni and Co in a total amount of 4-20 wt.%, Ti in an amount of 50-60 wt.%, V, Cr, Zr, Nb, Mo, Hf, Ta, and W in a total amount of 30-40 wt,%, C in an amount of 5-10 wt.%, and N in an amount of 3-8 wt.%. The carbonitride phase contains grains of a Ti carbonitride phase containing Ti in an amount of 90 wt.% or more with respect to all the metal components of the phase. When the cross-sectional microcrystalline structure of the cermet is observed, the ratio of "total area of grains of the Ti carbonitride phase having a ratio of Dmax/Dmin of 1.5 or more" to "total area of the hard phase" is 50% or more. <IMAGE> |
