Microstructure, Phase Composition, Physical and Mechanical Properties of Titanium Alloy VT23 Hot-Extruded Tube

Abstract

Macro-, microstructural, fine structure, phase composition, texture and complex of physical and mechanical properties in titanium alloy VT23 (Ti-5.5Al-4.7V-2.5Mo-1.1Cr-0.7Fe, wt. %) tube were studded by the macroanalysis, optical and transmission microscopy, X-ray phase analysis, durometry and microindentation methods. A close relationship between the structural-textural-phase state formed during the extrusion and the obtained level of strength, plastic, durometric properties and the contact modulus of elasticity in a hot-extruded tube has been established.

Evolution of Phase Composition and Thermal Expansion during Heating of VT23 Titanium Alloy

“…QPA of XRD data has revealed that the phase composition of the alloy is comprised by only α-and β-phase with volume ratio of 30/70 %, correspondingly. The detailed analysis of the alloy initial state is reported in [9]. The data of VT23 alloy elongation during heating is shown in Fig.…”

“…The hot-extruded tube is one of the deformable semi-finished products obtained from VT23 alloy [9]. The modeling of technological processes such as manufacturing of pipes, heat treatment and deformation of semi-products in a wide temperature range requires knowledge of thermophysical properties of the material and coefficient of thermal expansion (CTE) in particular.…”

Plastic Anisotropy Effect on Variation of Mechanical and Structural Properties of VT23 Titanium Alloy Subjected to Impact-Oscillatory Loading

“…In most cases, the previous DNP deteriorated the mechanical properties of the VT23 titanium alloy obtained by subsequent static tension. In addition, specimens cut in the transverse direction of rolling are more sensitive to this phenomenon than those cut in the longitudinal direction [44][45][46][47]. At the same time, a narrow ε imp range was found, in which the ductility of the VT23 titanium alloy can be improved.…”