A Research on the Influence of Anisotropic Characteristics of Single-Crystal Gas Turbine Blades on Their Durability

One of the key parameters in the gas turbine blade resource design stage is their long-term static strength analysis. Such analysis is crucial for various reasons, including studying anisotropic properties of single-crystal turbine blades composed of nickel heat-resistant alloys with different crystallographic orientations within a wide range of stresses and temperatures. To date, there is no universal methodology for assessing the durability of turbine blades. The existing approaches, documented in numerous literary sources, have both their pros and significant cons. The research, presented in this article, proposes a technique for evaluating the long-term static strength of single-crystal turbine blades. The authors’ method involves deriving equations for the distribution of the Larson-Miller parameter using experimental data for various crystallographic orientations of turbine blades. These equations were then used to create a finite-element model demonstrating the parameter's distribution in a cooled high-pressure turbine blade, using the ANSYS Workbench 19.2 software package. With the use of Larson-Miller parameter distribution calculations, the fracture time for each of the three specified crystallographic orientations of turbine blade model was investigated.