BONDED OBJECT OF TUNGSTEN CARBIDE-BASED SUPERHARD ALLOY AND PROCESS FOR PRODUCING SAME

摘要

Provided in the present invention is a bonded tungsten carbide-based super hard alloy assembly equipped with a first metal member having a first bonding surface and comprised of a steel material containing a martensite structure and a second metal member having a second bonding surface directly bonded to the first bonding surface of the first metal member and comprised of a tungsten carbide-based super hard alloy. The martensite structure-containing steel material which constitutes the first metal member is a stainless steel having an average carbon concentration of from 0.10 to 0.40 mass%. The first metal member has a high carbon concentration region at a depth ranging from 0.70 to 3.00mm from the first bonding surface. The high carbon concentration region has a maximum carbon concentration of from 0.3 to 1.2 mass%. The bonded tungsten carbide-based super hard alloy assembly has both high bonding strength and excellent mechanical strength.