This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the 4th stage of turbine GTE-45-3 with an operating time of 13,000 to 100,000 hours. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, non-standard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole.
The task of developing new powder materials for use in gas-thermal technologies is solved by cladding metal oxide particles with a refractory metal component. The results of studies of powders of domestic production based on aluminum oxide (corundum) and zirconium dioxide subjected to chemical nickel plating (8 and 30%) are presented. The morphology, granular and phase compositions, as well as the distribution of the elemental composition were studied using electron microscopy and X-ray diffraction analysis. It is shown that the formation of a dense and homogeneous metal shell around the particles of the matrix material occurs when 30% of the metal is clad. According to X-ray diffraction analysis, powder materials have a multiphase composition:for aluminum oxide powder clad with 8% Ni; (Ni + −Al2O3 + −Al2O3) -for aluminum oxide powder clad with 30% Ni, (Ni + T-ZrO2) -for dioxide powder zirconium clad with 30% nickel. New powder materials of domestic production are competitive in relation to foreign analogues and due to cladding with a metal component will contribute to improving the plasticity of plasma coatings formed from them.
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