Cemented Carbide Cutting Tool Chipping Resistance

A cemented carbide cutting tool made of a tungsten carbide-based alloy having high chipping resistance comprising:

8 to 13 percent by weight of Co and 0.1 to 3 percent by weight of Cr as constituents for forming a binding phase, the balance being tungstencarbide as a constituent for forming a dispersing phase and incidental impurities, the rate of the dispersing phase to the total of the dispersing phase and the binding phase being in a range of 72 to 90 percent by area and the average particle diameter being 1 μm or less according to measurement of an electron microscopic texture; wherein the dispersing phase of the cemented carbide cutting tool made of a tungsten carbide-based alloy comprises a dispersing phase composed of ultra-fine particles dispersed in a matrix and having a particle diameter of 100 nm or less, and the ultra-fine particles comprise a Co based alloy.

The Co content is limited to 8 to 13 percent by weight in the cemented carbide alloy constituting the cemented carbide cutting tool of the present invention, because sufficient toughness is not achieved at a content of less than 8 percent by weight whereas abrasion resistance steeply decreases at a content of higher than 13 percent by weight.


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