An integrated modification of multicomponent alloys

1Grekova, MV, 2Kalinin, AV, 3Djur, Ye.O, 3Nosova, TV
1Yuzhnoye State Design Office, Dnipro, Ukraine
2Prydniprovska State Academy of Civil Engineering and Architecture, Dnipro, Ukraine
3Oles Honchar Dnipro National University, Dnipro, Ukraine
Space Sci. & Technol. 2019, 25 ;(3):25-31
Publication Language: Russian
The aim of the task has been the development of technology of the complex modification of Ni-Cr-Al-Ti-Mo-W-Co multicomponent alloys by dispersible compositions. A nanodispersed modifier titanium carbonitrides Ti(C, N) served as a basis of a modifier. Nanopowders of a modifier were obtained on the facility of plasma-chemical synthesis. The scientific novelty of the work is to establish the mechanism of modifier action in the fusion. The optimum amount of modifier input was determined experimentally. The temperature-temporal options of modification were tested. Regularities of modification effect of titanium carbide dispersible refractory composition on improving complex properties of multicomponent nickel alloy were defined.
     The results obtained were used at the machine-building enterprise to increase the mechanical and operational properties of heatproof alloys for gas turbine engine blades. As a result of research on the modification of multicomponent nickel alloys ZS3DK, ZS6U for gas turbine engine blades it was defined that the introduction of complex modifier on the basis of nanopowder of titanium carbonitride into the fusion leads to the substantial modification of alloy structure. Nanoparticles of titanium carbonitride are the additional centers of crystallization. Formation at the modification of the fine-grained structure and strengthened solid solution leads to the improvement of mechanical and exploitation properties of the alloy, that has an important practical value. The considerable increase in strength and plastic properties was attained. Corresponding parameters’ augmentations are by 10% in σв, 13 % in σТ , 10…30% in δ , and 44% in КСU.  The longevity of alloy increased by 30% depending on the tension of tests. After tests on heat-tolerance, the depth of corrosion in the modified alloys is diminished by 25 % on average that confirms the effect of the modification.
Keywords: mechanical and operational properties, modifica-tion, nanocomposites, nickel alloy, structure
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