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

Analysis of the properties of the materials from which the parts of a gas 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 VT3–1 is the formation in the wear zone of a thermodynamically compatible, heat-resistant, and wear-resistant layer, which is different from the main material of the blade. Samples for research were cut from the bandage shelves of the compressor blade in the shank area: the first - with high-quality soldering relite, the second – the shelf is worn, and there is a defect in the form of a drop. It was found that the main titanium alloy has a homogeneous structure, 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 and wide grain boundaries of titanium alloy under defective soldering at the boundaries. Such clusters of defects are etched more strongly than the base metal, so the base alloy has a needle-like martensite hardened structure formed by rapid 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.