| 摘要 |
<p>Provided is a cutting tool which comprises a sintered cermet having high toughness and thermal shock resistance. The cutting tool, namely a tip 1, comprises a sintered cermet comprising: a hard phase 11 comprising one or more selected from among carbides, nitrides, and carbonitrides which comprise mainly Ti; and a binder phase 14 comprising mainly at least one of Co and Ni. The tip 1 has a cutting edge 4 lying along an intersecting ridge portion between a rake face 2 and a flank face 3, and a nose 5. The hard phase 11 comprises a first hard phase 12 and a second hard phase 13. When a residual stress is measured on the rake face 2 by 2D method, a residual stress à 11 [1r] of the first hard phase 12 in a direction (à 11 direction), which is parallel to the rake face 2 and goes from the center of the rake face 2 to the nose being the closest to a measuring point, is 50 MPa or below in terms of compressive stress (à 11 [1r]=-50 to 0 MPa), and a residual stress à 11 [2r] of the second hard phase 13 in the à 11 direction is 150 MPa or above in terms of compressive stress (à 11 [2r]‰¤-150 MPa).</p> |
