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Using single-crystal nickel-base superalloys for the gas turbine blades allows significantly increase the operating
temperature and consequently the economy of gas turbine engine. At the microscopic level, the single-crystal nickel
base alloys are structures consisting of two phases: γ'-phase, forming on the basis of Ni3Al, which
is dispersed in a matrix of γ-phase, representing a solid solution of alloying elements in nickel. On the basis
of finite element homogenization the analysis of the influence of phase composition on the stress-strain diagram, as
well as study the effect of the shape evolution of γ'-inclusion, occurring during the formation of raft structures,
on the creep curves are performed. The results of simulations demonstrate a good agreement with experimental data
for a single crystal nickel-base superalloy ZhS32.
Keywords: single crystal nickel base superalloy; phase composition; finite element modeling; stress-strain diagram; creep curves. |
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