| 摘要 |
The present invention relates to a sintered cemented carbide consisting of 50 to 90 wt-% submicron WC in a hardenable binder phase. The binder phase consists of, in addition to Fe, 10 - 60 wt-% Co, <10 wt-% Ni, 0.2 - 0.8 wt-% C and Cr and W and possibly Mo and/or V in amounts satisfying the relations <DF>2xC < xW+xCr+xMo+xV < 2.5xC </DF> where x denotes the mol fraction of elements in the binder phase and the following relation for the total Cr content <DF>0.03 < wt-% Cr/(100 - wt-% WC) < 0.05. </DF> In addition, the binder phase consists of martensite with a fine dispersion, a few percent, of coherent carbides, preferably of M2C type, with a size of the order of 10 nm. <IMAGE> |
