Theoretical modeling of thermodynamic processes of phase separation was carried out, as well as a practical study of the structure and distribution of chemical elements. Based on an integrated approach for the single-crystal system Ni-Al-Re-Ru-Cr- Co-W-Ta, new regression models were obtained that make it possible to predict the chemical composition of phases based on the chemical composition of the alloy. A comparative assessment of the calculation results obtained using regression models and experimental data obtained by X-ray spectroscopy was carried out. The experimental results obtained are as close as possible to the calculated data.

This study aimed to investigate the metallographic structure and the impact of the heat treatment process on the MAR-M247 superalloy, a high-temperature nickel-based superalloy commonly used in turbine blades. The heat treatment process can potentially influence the mechanical properties of the MAR-M247 superalloy at different temperatures. A strength simulation analysis of gas turbine blades should include the variations in the mechanical properties of the material. The effect of heat treatment on grain size was investigated by metallographic experiments, and numerical calculations of material mechanical properties were conducted. The mechanical property parameters necessary for finite element analysis of turbine blades were determined. Finally, a finite element simulation model of the blade was established based on these mechanical property parameters, and strength analysis was performed. The simulation results provided the stress distribution and the strength of the turbine blade.

This paper investigated the yield strength anomaly (YSA) in Inconel 718 superalloy through tensile and microstructure experiments. The study analyzed the flow behavior, examined fracture morphology, discussed dislocation distribution, and developed an adaptive constitutive model. Results show that both intermediate temperature brittleness and YSA occur at 700-800℃ and strain rates of 0.01-1 s^–1. This phenomenon is attributed to the influence of the intensity and content of the γ' phase on dislocation slip, reflecting the Kear-Wilsdorf locking mechanism. In addition, the fracture characteristics and dislocation distribution vary with temperature and strain rate. The modified Johnson-Cook model effectively predicts yield strength and plastic deformation, with advantages in wide temperature applicability (25-1000°C) and explicit YSA incorporation.