Mo 2 FeB 2 based cermets with various Ni, Cr and C concentrations were prepared. The effect of Ni, Cr and C on the phase composition and microstructure was investigated by scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDS) and X-ray diffraction (XRD). Hardness (HRA) and fracture toughness (K 1c ) were also measured. It was found that nickel alloying leads to formation of two-phase state represented by Mo 2 FeB 2 boride and austenite. Chromium alloying results in austenite to ferrite transformation and M 23 C 6 and M 6 C carbide precipitation in the case of carbon doping. Also, it was found that chromium influences the borides mean size. Observed changes in the phase composition and microstructure affect the hardness and fracture toughness of investigated materials.
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