Structure and Properties of Surface Bandage Shelves for the Gas Turbine Engine’s Blades

Abstract

Analysisofthepropertiesofthematerialsfromwhichthepartsofagas turbine engine are made showed that they must have a high melting point, high strength, high creep resistance, and be machined. Therefore, the best option for strengthening the blades of titanium alloy VT3–1istheformationinthewearzone ofathermodynamicallycompatible,heat-resistant,andwear-resistantlayer,which is different fromthemainmaterialoftheblade.Samplesforresearchwerecutfrom the bandageshelvesofthecompressorbladeintheshankarea:thefirst-withhighquality soldering relite, the second– the shelf is worn, and there is a defect in the formofadrop.Itwasfoundthatthemaintitaniumalloyhasahomogeneousstructure, and the surface of the defective coating has a lower roughness, microcracks. Its local areas differ in elemental composition. Clusters of pores explain the clear andwidegrainboundariesoftitaniumalloyunderdefectivesolderingattheboundaries. Such clusters of defects are etched more strongly than the base metal, so the base alloy has aneedle-like martensite hardened structure formed byrapid cooling in the air after soldering. It is proved that such defects are formed due to the violation of soldering technology. It is proposed to create a protective layer of composite material VTN-1 with tungsten particles, which contains solid parts of tungsten carbide and titanium-based solder VPr16, to strengthen the working blades in the wearing zone.