Influence of temperature of radial-shear rolling on the structure of VT3-1 alloy

Abstract

The selection of optimal processing modes in the technological process enables the achievement of desired properties in titanium alloy products. Their structural and phase state significantly determines the mechanical and operational properties of the final product. This paper analyzes the influence of temperature deformation modes during radial-shear rolling of VT3‑1 titanium alloy rods. Billets with a diameter of 95 mm were rolled in 1, 3 and 5 passes at temperatures of 1060, 980 and 900 °C, respectively. The temperature of radial shear rolling, as well as the macrostructure and microstructure of the obtained rods were analyzed. Differences in the formation of macrostructure and microstructure across the cross section, as well as at the front and rare ends of the rods are shown. Analysis of the temperature changes showed that the surface temperature of the rods reached the polymorphic transformation temperature only when heated in the β‑region. It remains lower during rolling in three and five passes. The axial zone has the highest temperature, which increases during deformation and leads to the formation of a macrostructure with a grain-size number from 4 to 6. The obtained results demonstrate the possibility of controlling the structure formation in the rods by varying the technological parameters, as well as the potential of using these findings to develop digital models with further accumulation of direct experimental data.