| Abstract: |
Within the field of wear protection, the utilization of cast tungsten carbide (CTC) reinforced cored wires in Twin Wire Arc Spraying (TWAS) processes provides a method for the manufacturing of cermet coatings with improved mechanical and tribological characteristics. In the field of surface engineering, machine hammer peening (MHP) is a novel surface treatment technology, which enhances the surface properties, especially for surfaces undergoing tribological contact, due to local hardness increase and insertion of compressive residual stresses below the surface.
In this study the wear behavior of WC-W2C FeCrCMnSi arc sprayed coatings derived from conventional cored wires with a different chemical composition, relative to the hard phase content, are investigated. According to this, hammer peened surfaces are compared to as-sprayed and polished samples by means of metallographic investigations. With the use of ball-on-disc and dry rubber wheel tests, dry sliding and rolling wear effects on a microscopic level are scrutinized. It has been shown that under hammer peened conditions the corresponding coatings are able to obtain higher wear resistances and lower friction coefficients than the conventional coatings. This can be attributed to strain hardening effects, which was revealed by mechanical response using nanoindentation. Moreover, dislocation density was examined by means of electron channel contrast microscopy technique (ECCI).
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