TOOL FOR COLDFORMING OPERATIONS

摘要

An improved hard wearing surface zone is being formed in a tungsten carbide-cobalt cemented carbide. This has been achieved by a post-sintering heat treatment in a boron nitride containing environment of a hard metal of a suitable composition. The effect is most pronounced when the heat treatment is made of a hard metal which has previously been sintered to achieve a high carbon content through a suitable choice of chemical composition and processing conditions.