The irreversible structural modifications of single crystals fine structure of Ni-based superalloys at enduring operation of turbine blades

Nazarkin R.M., Kolodochkina V.G., Ospennikova O.G., Orlov M.R.
UDC
620.179:669.018.44:669.245
DOI
10.18577/2307-6046-2015-0-12-3-3
Article PDF (Russian) (928.36 KB)
How to cite
Nazarkin R.M., Kolodochkina V.G., Ospennikova O.G., Orlov M.R. The irreversible structural modifications of single crystals fine structure of Ni-based superalloys at enduring operation of turbine blades // Proceedings of VIAM. 2015. No. 12. DOI: 10.18577/2307-6046-2015-0-12-3-3. URL: https://test.viam.ru/en/journal/2015/12/3
Abstract

The results of researches of single-crystal rotor blades from cast Ni-based superalloy ZhS32-VI in process of long-time life cycle testing of gas turbine engine (high-pressure turbine) are represented for microstructure and substructure. It is shown that precipitation of TCP-phases particles in the alloy during high-temperature testing is accompanied by the decreasing of crystal lattice constant of γ-solid solution. It is verified by data of x-ray diffraction analysis, x-Ray microanalysis and scanning electron microscopy. The point is proposed that decreasing of alloying element content in the γ-solid solution as result of TCP-phases precipitation (rich with the refractory elements) leads to the fall of the high-temperature resistance of the material. Also, a TCP-phases make negative influence on mechanical properties of the alloy due to the local destruction of coherency for interphase boundaries in zone of development of TCP-phases particles.

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