Coated cutting tool having an outer layer of TiC

A coated cutting tool for the milling of ductile iron, the cutting tool comprising:

• a rake face and a flank face, a cutting edge at the a juncture of the rake face and the flank face, and the cutting tool having a coating and a substrate;
• the substrate comprising a tungsten carbide based cemented carbide having a bulk composition of no more than 7 weight percent tantalum, no more than 3 weight percent niobium, no more than 5 weight percent titanium, no more than 1 weight percent chromium, between about 5 and about 13 weight percent cobalt, and the balance tungsten carbide;
• and
• the coating comprising an innermost coating scheme including at least one layer adjacent to the substrate, and the coating further including an outermost layer consisting essentially of titanium carbide applied by chemical vapor deposition.

A method of making a coated cutting tool comprising the steps of:

• providing a substrate that is a tungsten carbide based cemented carbide having a bulk composition of no more than 7 weight percent tantalum, no more than 3 weight percent niobium, no more than 5 weight percent titanium, no more than 1 weight percent chromium, between about 5 and about 13 weight percent cobalt, and the balance tungsten carbide;
• applying an innermost coating scheme to the substrate;
• and
• applying by chemical vapor deposition an outermost layer of titanium carbide to the inner coating scheme.