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Damage Mechanisms in Graded Hard Metals under Cyclic Loads

Cutting tools made of hard metals with a graded surface zone and a hard coating show a strongly increased lifetime in the technical application, compared to the homogeneous, coated hard metal. The aim of this work was to achieve an understanding of these behaviours. Investigations of the mechanical properties under different loading conditions (i. e. static, monotonically increasing, and cyclic loads) and of the states and processes in the microstructure by SEM and TEM revealed the dominating damage processes in the different materials.