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1. (WO2017191744) CEMENTED CARBIDE AND CUTTING TOOL

Pub. No.:    WO/2017/191744    International Application No.:    PCT/JP2017/015138
Publication Date: Fri Nov 10 00:59:59 CET 2017 International Filing Date: Fri Apr 14 01:59:59 CEST 2017
IPC: C22C 29/08
B22F 3/24
B23B 27/14
C22C 1/05
Applicants: SUMITOMO ELECTRIC INDUSTRIES, LTD.
住友電気工業株式会社
Inventors: KIDO Yasuki
城戸 保樹
MATSUKAWA Michiko
松川 倫子
TSUDA Keiichi
津田 圭一
Title: CEMENTED CARBIDE AND CUTTING TOOL
Abstract:
Provided is cemented carbide comprising a hard phase, a binder phase, and unavoidable impurities. The hard phase is provided with a first hard phase having tungsten carbide as its main component and with a second hard phase having as its main component a compound containing a plurality of metal elements including tungsten and at least one element selected from carbon, nitrogen, oxygen, and boron. The second hard phase satisfies D10/D90 < 0.4 where D10 is the 10% cumulative grain size and D90 is the 90% cumulative grain size in the area-based grain size distribution determined from any surface or cross section of the cemented carbide. Defining σ2 as the variance on the distance between the centroids of two nearest neighbor second hard phases, the second hard phase satisfies σ2 < 5.0. Defining DW as the average grain size of the first hard phase and DM as the average grain size of the second hard phase, DW is 0.8 μm to 4.0 μm and DM/DW < 1.0 is satisfied.