Tribological properties of solid solution strengthened laser cladded NiCrBSi/WC-12Co metal matrix composite coatingsBergant, Zoran (Avtor) Šetina, Barbara (Avtor) Felde, Imre (Avtor) Šturm, Roman (Avtor) Sedlaček, Marko (Avtor) wearsolid-solution strengtheninglaser claddingNiCrBSiWC-CocoatingNiCrBSi, WC-12Co and NiCrBSi with 30, 40 and 50 wt.% WC-12Co coatings were produced on low carbon steel by laser cladding with an Nd:YAG laser with a multi-jet coaxial cladding-nozzle. The microstructure properties after WC-12Co alloying were investigated by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and Vickers hardness tests. The resulting microstructures consisted of a γ-Ni and Ni$_3$B matrix, strengthened with Co and W, Ni$_3$Si, CrB, Cr$_7$C$_3$, Cr$_{23}$C$_6$ , WC/W$_2$C phases. In coatings with 30, 40 and 50 wt.% WC-12Co, a solid solution, strengthened multi-matrix NiCrWCo phase formed, which yielded a higher matrix hardness. Wear tests that monitored the friction coefficients were performed with a tribometer that contained a ball-on-disc configuration, Al$_2$O$_3$ counter-body and reciprocal sliding mode at room temperature. The major wear mode on the NiCrBSi coatings without the WC-12Co was adhesive with a high wear rate and visible material loss by flaking, delamination and micro-ploughing. The addition of WC-12Co to the NiCrBSi coating significantly increased the wear resistance and changed the major wear mechanism from adhesion to three-body abrasion and fatigue wear.20222022-01-06 07:48:48Članek v reviji134322UDK: 620.1:539.92ISSN pri članku: 1996-1944DOI: 10.3390/ma15010342COBISS_ID: 92175107sl