The influence of deformation conditions of titanium alloys on the surface quality of the feather of compressor blades

Abstract

Purpose of work. Improving the quality of manufacturing of blanks of compressor blades from titanium alloys by precision stamping. Research methods and equipment. The research was carried out by precise stamping of blade blanks from the VT8 titanium alloy of the compressor of the D-436 aircraft engine at various temperatures of deformation. Precise stamping of parts was carried out in one tool stroke from a preliminary blank obtained by extrusion from a rod with a diameter of 30 mm. The research of the surface of the workpiece was carried out after processing by X-ray spectral analysis on a JSM6360LA scanning electron microscope. Microhardness was measured on a PMT-3 device at a load of 50 g. Investigations by precision stamping were also carried out on blades made of the OTCh-1 alloy of the input guide vane of the HPC of the D-136 helicopter engine and on the rotor blades of the compressor of the D-36 aircraft engine made of VT3-1 titanium alloy. The obtained results. It is shown that the conditions of deformation of a titanium alloy blade blank by precise stamping have a significant effect on the quality of its surface (macrostructure and microstructure). The deformation temperature of the metal affects the macrostructure and microstructure of the surface during precision stamping of blades from titanium alloys. Scientific novelty. It has been established that during precise stamping of blade blanks from titanium alloys, the deformation temperature has a significant effect on the quality of their surface. The values of the deformation temperature are determined, which provide a significant level of quality of the surface of the airfoil of the blades with precise stamping. Practical value. The results obtained made it possible to develop multi-pass stamping of blade blanks from titanium alloys, when fractional deformation in one pass is applied, not exceeding 30%. The heating temperature of the intermediate billet for deformation should be as close as possible to Тm within  ± 10 °С.