Coated cutting tool
AssigneeAB Sandvik Coromant
InventorsSusanne Norgren, Bartek Kaplan
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Abstract
The present invention relates to a coated cutting tool including a Cr-containing cemented carbide substrate having WC, a binder phase and a gamma phase. The cemented carbide includes a gradient surface zone with a thickness of between 2 to 100 μm, which is binder phase enriched and depleted of gamma phase. The cemented carbide includes M7C3 carbides in an amount of between 0.5 to 7 area % measured in the bulk, where M is elements being Cr, W and at least one binder metal. The coated cutting inserts shows an improved edge line toughness.
Claims14
A coated cutting tool being a metal cutting turning insert comprising a Cr-containing cemented carbide substrate comprising WC, a binder phase and a gamma phase, wherein the cemented carbide includes a gradient surface zone with a thickness of between 2 to 100 μm, which is binder phase enriched and depleted of gamma phase, wherein the cemented carbide comprises M7C3 carbides in an amount of between 1.5 to 6 area % measured in a bulk of the substrate, and wherein M is elements comprising Cr, W and at least one binder metal.
Dependencies are inferred from the claim text.