Study of single crystal turbine blades made of ZhS32 alloy with a promising scheme of cooling

The results of studying single-crystal turbine blades with a promising scheme of cooling, cast from a heat-resistant ZhS32 alloy using ceramic rods with high-temperature sintering additives and additional impregnation with a varnish solution are presented. The program of crystallizing blades with a single-crystal structure is improved on a VIP-NK installation. A comparison of the operation modes of the updated program and serial technology is presented. A pilot batch of blade castings is obtained under production conditions of a machine-building enterprise with an output suitable in single-crystal structure of about 94%. Blade castings are studied using X-ray diffraction, X-ray and ultrasound methods. Quantitative metallographic analysis is carried out on an optical complex to determine spacing between axes of the first order dendrites (λ1) of the alloy and the volume fraction of the micropores in the cross section of the pen and casting lock. The results of scanning electron microscopy study of macro-and microstructure of the blade castings with a promising cooling scheme showed that the structure is typical for ZhS32alloy in the cast state and is well formed in the elements of the inner cavity of monocrystalline blades.

refractory nickel superalloys, single crystals, directional crystallization, high-temperature nickel alloys, ceramic rod, single crystals, macro-etching, micro-etching, large-angle boundaries, small-angle boundaries, disordering of structural blocks

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