20.500.12556/RUL-134322 Tribological properties of solid solution strengthened laser cladded NiCrBSi/WC-12Co metal matrix composite coatings NiCrBSi, 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. wear solid-solution strengthening laser cladding NiCrBSi WC-Co coating obraba utrjevanje lasersko oblaganje prevleke true false true Angleški jezik Slovenski jezik Članek v reviji 2022-01-06 07:48:48 2022-01-06 07:48:56 2022-09-13 03:54:31 0000-00-00 00:00:00 2022 0 0 20 str. iss. 1, art. 342 Vol. 15 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.1:539.92 1996-1944 10.3390/ma15010342 92175107 RAZ_Bergant_Zoran_2022.pdf RAZ_Bergant_Zoran_2022.pdf 1 9699DA2C7C2EB8EDEC2A46B5EBBBB252 c1afe221ed1dbe0ac9bf61ed34255141236f5e92fb30f4a019ff0def8bd3e0cc 21a5fa0a-6ebd-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152717 https://www.mdpi.com/1996-1944/15/1/342 1 8d4e1767-6ebc-11ec-abdb-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=152716 Fakulteta za strojništvo 0 0 0