Abstract

     The modern approaches to modeling for creating new nickel-based superalloys are analyzed. The computer calculation methods used in domestic and foreign practice and based on multifactor design of experiments are presented

Introduction

     Currently, the active work on creating the fifthand sixth-generation aviation gas turbine engines, which is being performed in advanced states, is accompanied by vigorous development of effective methods to significantly facilitate and shorten the time of production of new high-temperature alloys, the difficulties of manufacture of which have increased many times due to the sharp complication of alloying. The regions of optimum alloy compositions began to be located near the phase boundaries of various undesirable or harmful phases.

     This problem is challenging due to the fact that the achieved complexity of alloying (primarily cast nickel superalloys) has led to the fact that their further development and optimization of the compositions of promising alloys are associated with ensuring simultaneous consideration of a significant number of the factors directly affecting their performance.

ANALYTICAL CALCULATIONS OF PHASE DIAGRAMS

     In the 1960s–۱۹۷۰s of the last century, the direction of calculating and predicting phase diagrams in materials science, which today has resulted in a rather powerful and popular direction, developed very actively. The problem of finding criteria for phase diagrams of different types has been solved since the time of van der Waals [4], who, working in the field of theoretical molecular physics, studied the behavior of molecules characterizing the state of material. In 1869, he discovered the forces of interaction between molecules, which were later called the van der Waals forces. In 1873, in his dissertation for Doctor of Philosophy, he developed a model, which uniformly describes the gaseous and liquid forms of matter, and derived an equation of state for gases and liquids. About this work, Maxwell said that it immediately put his name on a par with the most outstanding names in science.