A Substrate A Coated Cutting Insert And A Method Thereof

Abstract

A substrate made by sintering a compacted mass of starting powders in an atmosphere having at least a partial pressure wherein the starting powders containing the following components: cobalt, tungsten, carbon, titanium and tantalum, the substrate comprising:a peripheral surface defined by a rake surface, a flank surface, and a cutting edge at the intersection of the rake and flank surfaces;The substrate having a zone of non-stratified cobalt enrichment beginning adjacent to and extending inwardly from the cutting edge and at least one of the rake surface and the flank surface toward a bulk region, the bulk region having a porosity according to ASTM Designation B276-91 (Reapproved 1996) of greater than C00;the zone of cobalt enrichment being at least partially depleted of the solid solution carbides and/or solid solution carbonitrides;the zone of cobalt enrichment not exhibiting any carbon precipitation; and the zone of cobalt enrichment having a cobalt content between about 125 percent and about 300 percent of the cobalt ontent of the bulk region.

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