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Abstract
The paper presents a study of welded joints of cast intermetallic single-crystal rhenium containing VKNA-25 alloy with crystallographic orientation [001] and deformable high-temperature disk nickel alloy EP975, depending on the parameters (temperature and degree of deformation) of pressure welding under superplasticity conditions. Comparison of samples before and after heat treatment is presented. The results of X-ray micro-spectral analysis of a solid-phase joint in the welding zone and at distances of up to 140 μm are presented in comparison with the initial chemical composition of the alloys, indicating an intense course of diffusion processes. The results obtained are analyzed from the point of view of maintaining the balance of alloying, calculated by the method of G.I. Morozova (calculating the number of valence electrons per unit atomic mass of the composition), the change in the atomic mass and average electron concentration of solid-phase compounds before and after heat treatment in the welded joint zone and at distances up to 140 μm was calculated. It is shown that the alloy compositions calculated taking into account the alloying balance make it possible to obtain a high-quality one-piece connection of a disk and a blade for blisk-type structures, performed under superplasticity on an installation for high-temperature pressure welding.
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