The paper examines the microstructure and mechanical properties of experimental compositions of a heat-resistant cobalt superalloy, produced by the method of selective laser melting (SLM). Strengthening in the studied materials is achieved by the formation of a fine-celled structure of a solid solution based on cobalt and highly dispersed intermetallic and carbide phases. By the EMPA (electron micro probe analysis) method, the ratio of chemical elements in these phases was evaluated and their type was determined. It was estimated that the tantalum content determines the strength properties of the alloy. It was found that dispersed particles formed during the synthesis have a positive effect on the creep resistance at 800 °C temperature, whereas at 1100 °C temperature the destruction occurs along the boundaries of the persisted structure of synthesis, regardless of the alloying and morphology of structural components.
Cobalt-based alloys are widely used for manufacturing of various components of gas turbine engines and gas turbines such as vanes and combustion chambers both in wrought state and as cast parts. They have been designed for improving the heat resistance due to solid solution and carbide-strengthening mechanisms. In order to obtain satisfactory oxidation resistance and hot corrosion resistance cobalt-based alloys are doped with sufficient amount of chromium (above 15 % wt.). Recently additive manufacturing has started to use cobalt-based alloys. The paper considers the features of the structure of high-temperature cobalt-based alloys and their application in various branches of industry.
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