Abstract
The analysis of modern nickel-based superalloys evolution for casting single-crystal turbine blades was performed. The influence of rhenium as a new alloying element on the physicochemical, kinetic, and structural parameters of nickel-based superalloys and phase stability is discussed. The following experimental data are generalized: the coefficients of segregation and distribution of alloying elements in nickel-based superalloys gamma- and gamma'-phases, the influence of alloying elements on the melting temperature, gamma- and gamma'-phases crystal lattice parameters, diffusion rate of atoms and probability of topologically close-packed (TCP) phase formation. The principles of the balanced alloying and computerized design method for developing fourth-generation single-crystal nickel-based superalloys with high Re content (9 –10 %) are considered. The role of high gradient directional solidification (200 –220°C cm–1) in producing single-crystal turbine blades of nickel-based superalloys with high Re content is discussed.
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