THE INFLUENCE OF TEXTURE ON THE FORMATION OF A SOLID-PHASE COMPOUND OF TITANIUM ALLOY VT6 UNDER CONDITIONS OF SUPERPLASTICITY

10.25712/ASTU.1811-1416.2024.03.013

Abstract

Results of experimental study of solid-phase weldability of titanium alloy VT6 at temperature 900 °C under conditions of superplasticity are given. Welding experiments have studied the conditions for achieving a high-quality solid-phase joint in various structural states. When connecting samples with microcrystalline and large crystal structures, the quality of welded joints is influenced by the texture of the material. It is known, the anisotropy of flow stresses due to the presence of metallographic texture is a negative factor in the manufacture and operation of products. Metallographic studies have shown, the extent of the pores relative to the interfacial boundaries in the junction zone decreases. The greater the angle of inclination of the crystallite relative to the direction of deformation, the smaller the pore length. When the crystallites are oriented perpendicularly to the acting load, the shape change in the formation of physical contact is carried out due to internal sliding. To ensure the activation of the contact surfaces, the crystals should be oriented taking into account the existing sliding systems. As angle of turn of α-plates increases relative to direction of deformation under similar conditions of superplastic deformation, quality of welded joint increases. The quality of the welded joint is improved by filling and dividing the plastic β-phase.