MECHANICAL AND CORROSION PROPERTIES OF MULTICOMPONENT ALLOYS, MODIFIED BY DISPERSE COMPOSITIONS

Btained in plasma-chemical synthesis plants. Methodology. Dispersed and nanodispersed powder compositions based on titanium, titanium carbide and aluminum up to 1 μm in size are obtained at industrial high-frequency plasma synthesis plants in JSC "Neomat" (Riga, Latvia). Powder compositions were compressed into tablets of 30 × 10 mm size and used as nickel melt modifiers. The material of the study was a multicomponent nickel alloy of the Ni-Cr-Al-Ti-Mo-W-Co system obtained by equiaxed crystallization. Results. The results of experimental and pilot-industrial tests of a complex of mechanical properties and corrosion resistance of a multicomponent high-temperature nickel alloy ZhS6K used for the manufacture of gas turbine engine blades were presented. The technological mode of modifying the nickel melt by dispersed compositions based on titanium carbide was developed. The peculiarities of a modified alloy structure formation, as well as the complex of strength plastic properties, are studied. A significant refinement of the alloy grain as a result of modification was achieved, which led to increaseing of strength properties of up to 10% and an impact strength up to 35%. The corrosion resistance of the alloy ZhS6K in oxidizing environment was increased, the corrosion depth at 1000 ° C decreased by 25% in comparison with the unmodified alloy. The increase in durability and hightemperature corrosion is associated with a more even distribution of excess phases in the structure of the modified alloy. Scientific novelty. The regularities of the effect of modifying a titanium carbide by a dispersed refractory composition on increasing the complex of a multicomponent nickel alloy properties are established. Practical significance. The obtained results were used at the machine-building enterprise to improve the mechanical and operational properties of high-temperature alloys for gas turbine engine blades.