1. Introduction Since hardmetals were invented by Schröter and Prof. Skaupy in the 1920s [1], it has been clear that the marriage between tungsten carbide (WC) and cobalt (Co) is something special. The combination of high hardness and high toughness is unique, and essential in the machining industry. Due to the magnetic properties of cobalt, it is also possible to perform non-destructive characterization by using different magnetic parameters of the hysteresis curve.
