Scientific Approaches to the Optimization of the Main Critical Tempera-Tures of Nickel-Based Superalloys of Equiaxial Crystallization

Abstract

Purpose. It consists in establishing regularities of the influence of alloying elements on the thermophysical characteristics of nickel-based superalloys of equiaxial crystallization, which allows to optimize the manufacturing and heat treatment processes.
 Research methods. The experimental values were processed by mathematical methods to obtain correlation dependencies of the "parameter-property" type and establish regression models that optimally describe these dependencies.
 Results. The regularities of the influence of the chemical composition of nickel-based superalloys on thermophysical characteristics have been established. We have obtained ratios that allow us to take into account the criteria of competition (cooperation) of chemical elements and obtain diagrams by which it is possible to determine critical temperatures.
 Scientific novelty. The established ratios of Kg¢, Kg, KMC and KM23C6 allow taking into account the criteria of competition (cooperation) of chemical elements in the chemical composition of nickel-based superalloys of equiaxial crystallization. Thanks to the obtained ratios, a diagram was obtained with the help of which it is possible to establish thermophysical characteristics for the alloys of the specified group.
 Practical value. An effective solution for establishing the main critical temperatures of nickel-based superalloys of equiaxial crystallization is proposed, which made it possible to optimize the temperatures of production, heat treatment and operation.