| 摘要 |
[Problems] To provide a cutting tool consisting of a hard material improved in the adherence between a substratum of cemented carbide having hard phases bound by a binder metal and a TiN layer superimposed on a surface of the substratum, and provide a process for producing the same. [Means for Solving Problems] There is provided a cutting tool consisting of a hard material, characterized in that the hard material has a substratum containing hard phases and a binder metal and a TiN layer superimposed on a surface of the substratum, and that the substratum has beta-phases consisting of at least one solid solution of carbide, nitride or carbonitride containing W and at least one member selected from among Ti, Ta, Nb and Zr, and that at least some of the beta-phases lie at a surface of the substratum, and that the TiN layer has crystals with the same orientation relationship as that of beta-phase crystals just above the beta-phases of the substratum surface.
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