Chromium-containing cemented carbide body having a surface zone of binder enrichment

摘要

A coated cemented (binder alloy, e.g., cobalt-chromium alloy) tungsten carbide cutting insert that comprises a substrate and a coating. The substrate contains at least about 70 weight percent tungsten and carbon, between about 3 weight percent and about 12 weight percent cobalt, and at least 0.09 weight percent chromium. The substrate presents a surface zone of binder alloy enrichment that begins near (or at) and extends inwardly from a peripheral surface of the substrate. The coating includes a base layer that contains chromium.