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Studies of surface layer material degradation of the most loaded elements of gas turbine engine structural components revealed the essential changes in the structure and elemental composition of this layer in the thermal fatigue crack initiation zones, as well as along the propagating crack lips. The intensity of the observed changes implies the necessity of their account in the stress-strain state calculations and residual life estimations of high-temperature structural components of gas turbine engines.

The results of creep-rupture data processing for heat-resistant nickel alloys by parametric methods, by the Trunin and base diagram methods are presented. The line of investigations to establish the relation between the chemical composition and creep rupture strength is considered.

We study the phase composition, the structure of the surface degraded layer, and the concentrations of elements of a directionally crystallized superalloy tested in a high-temperature gas flow. The dependences of the degree of damage to the surface layer on the level of thermal stresses are established.

Thermal and stress-strain states of the wedge-shaped specimen, which simulate GTE blade edge material state, have been analyzed under thermal cyclic loading in a gas flow. A significant influence of the mechanisms and kinetics of degradation in the surface layer material properties on the stress state of various zones of the wedge-shaped specimens and the character of thermal fatigue crack initiation and growth depending on the damage level is shown. The results of investigation of the influence of dimensions, localization and kinetics of thermal fatigue cracks on the change of the structure (specimen) stress-strain state as a whole are presented.

We present the results of investigation of the kinetics of damage to structural elements made of refractory alloys (including the elements with protective coatings) under cyclic thermal loading. The influence of the stress-strain state on crack propagation under conditions of thermal fatigue loading is analyzed.