Aerospace Technic and Technology

It is studied the existing aspects of the modification of multicomponent alloys. It is carried out the analytical review of existing ideas about the problem of increasing the corrosion resistance of heat-resistant nickel alloys of the JS group. It is analyzed the influence of alloying elements on structural transformations, types of hardening and corrosion resistance. It is determined criteria for the physical properties of modifiers of nickel alloys: the magnitude of the ionization potential, insolubility in the melt, the crystallization interval according to the state diagram. It is analyzed the modification of melts with modifiers based on pure transition metals and rare-earth metals. Experimental work was carried out on the smelting of heat-resistant nickel alloy ZS6K in the industrial engineering production. A scheme has been developed for a rational technological smelting process using powder modifier in tablet form. Particular attention was paid to the preparation of charge materials and their cleaning. Casting molds were obtained by serial technology of the workshop of a machine-building enterprise. Models of castings were made in special molds. The model mass was smelted by the technological process, and the form was roasted at a temperature of 950 ... 1050 ° C. The alloy was smelted and the forms were cast in a vacuum with a residual pressure of 0.13 ... 6.66 Pa, the residual pressure was changed during deoxidation to 13 Pa. The uniform distribution of the modifier in the melt volume was provided by induction stirring in the crucible. It is proposed a complex powder modifier based on titanium carbonitride Ti (CN) in tablet form for the treatment of nickel melts. It was studied the macro and microstructure of the ZS6K nickel alloy. The regularities of the effect of modifying dispersed refractory titanium carbonitride composition on the increase in the complex properties of a multicomponent nickel alloy are established. It was achieved a significant grinding of alloy grains as a result of modification, which led to an increase in strength properties up to 10% and impact strength up to 35%. The corrosion resistance of ZhS6K alloy in an oxidizing environment increased, the depth of corrosion at a temperature of 1000 ° decreased by 25% compared to the unmodified state.

alloy; modifier; structure; power; blades GTE

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