Impurity Effects of Fe and Ni on Properties of WC-Co Alloys

Suzuki Hisashi, Sugiyama Masataka, Umeda Takateru

doi:10.2320/jinstmet1952.28.10_577

Two series of WC-Co alloys having constant 10% binder and containing approximately up to 2%Fe and Ni in alloys respectively were vacuum-sintered at 1400°C for 1 hr, carefully controlling the carbon content of each alloy. Using the alloys of the equal carbon content, effects of Fe and Ni on properties of as sintered WC-Co alloys and also of the alloys subsequently annealed at 800°C for up to 30 hr were investigated. The results are as follows. (1) As sintered state: Ni has almost no effect on the mechanical properties but Fe decreases the strength of alloys, indicating the limits of the Fe impurity in cemented carbides to be less than about 0.5%. The lattice constant of the binder phase increases with Fe but decreases with Ni addition. Therefore, the real value of pure WC-Co alloys is estimated to be about 3.550 Å. The magnetic saturation varies ordinally with Fe and Ni. The relation between the above mentioned properties and the carbon content in alloys containing constant Fe or Ni is essentially similar to that of straight WC-Co alloys⁽¹⁾. (2) As low temperature annealed state: No change in hardness is observed but the strength decreases as the annealing time increases. The lattice constant of the binder and magnetic saturation decrease as the carbon content of alloys becomes lower in the two-phase range. Such an annealing effect of alloys containing Fe or Ni is the same as WC-Co alloys already reported⁽²⁾, so that the cause of the annealing effect may also be attributed to the precipitation of W from the binder phase.

Impurity Effects of Fe and Ni on Properties of WC-Co Alloys

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