A new methodology for identification of β-transus temperature in α+ β and β titanium alloys using ultrasonic velocity measurements

Abstract

A new methodology has been established for identification of β-transus temperature in α + β and β titanium alloys by ultrasonic velocity measurements in a single specimen in one microstructural condition only. This methodology is based on a linear correlation obtained for the variation in β-transus temperature with ultrasonic longitudinal wave velocity in various titanium alloys specimens, β-heat-treated followed by water quenching. Furthermore, it has been demonstrated for the first time that ultrasonic velocity in α ' martensitic structure increases with the addition of α-stabilizing elements and decreases with the addition of β-stabilizing elements for α+ β titanium-alloys.