Hard powder alloys and carburized chromium steels in the Cr-Fe-C system

The literature data for the Cr-Fe-C system are used to construct the Fe-Cr3C2 vertical section showing wide two-phase (alpha Fe) + (Cr, Fe)(7)C-3 and (gamma Fe) + (Cr, Fe)(7)C-3 regions. Sintering of a powder mixture of iron and chromium steels Kh17N2 and Kh13M2 with higher chromium carbide is studied, and sintering conditions are optimized. It is shown that dissolution of Cr3C2 in the metal matrix of both chromium steels is described with a series of phase transformations: Cr3C2 -> -> Cr7C3 -> (Cr, Fe)(7)C-3 -> (Cr, Fe)(23)C-6. The effect of structure and phase composition on the mechanical properties (bending strength, HRA hardness, impact strength, fracture toughness), tribotechnical characteristics, wear resistance, and corrosion resistance is examined for the hard alloys and carburized steels Fe-Cr3C2, Kh17N2-Cr3C2, and Kh13M2-Cr3C2. Application of the materials developed allows an increase in the service life by 7-10 times for operating elements of feed mills and high-wear parts of equipment in construction industry.