| Abstract: |
Due to their outstanding properties, WC-W2C iron based cermet coatings are widely used in the field of wear protection. Regarding common used WC-W2C reinforced coating systems, it has been reported that their tribological behavior is largely determined by the carbide grain size fraction and their amount, relative to the metallic binder. Although the manufacturing route for arc sprayed WC-W2C cermet coatings is in an advanced state, there is still a lack of knowledge about the performance of cored wires with fine grain sized carbides as filling material and their related coating properties when post-treatment processes are used such as machine hammer peening (MHP).
A major objective was to characterize WC-W2C FeCrCMnSi arc sprayed coatings deposited with different carbide grain size filling with respect to their mechanical and tribological behavior. Thus, tribological investigations using dry rubber wheel and ball-on-disc test were performed at room temperature in order to analyze the wear and friction behavior. In addition, metallographic investigations were carried out to analyze their lamellar microstructure. The distribution of elements was determined by using electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX) as well as glow discharge optical emission spectroscopy (GDOES). As-sprayed and polished samples were compared to compressed samples since hammer peening processes lead to densification of the microstructure formation. The effect of hammer peening processes on the tribological behavior was investigated as the utilization of conventional and fine grain sized carbides as feedstock material lead to a different coating microstructure.
|
|
