The Investigation of the Chemical Composition, Structure, and Mechanical Properties of EP648 Alloy at Different Stages of Additive Manufacturing

Abstract

The chemical composition of a nickel heat-resistant alloy of the EP648 brand at different stages of additive manufacturing, as well as the structure and mechanical properties of the synthesized material in comparison with a material obtained via a traditional deformation method, is investigated. It is shown that the application of additive technologies in the manufacture of EP648 nickel heat-resistant alloy leads to a significant increase in the concentration of gases (O and N) in the alloy, formation of a fine-grain structure, and increased porosity. Here, an increase in the strength properties and a decrease in the impact strength, low cycle fatigue, and plasticity are characteristic of such a material. The time to failure of the synthesized specimens in a creep rupture test exceeds that of sheet specimens but is inferior to that of deformed bars.