The kinetics of phase transformations during continuous cooling of the Ti6Al4V alloy from the single-phase β range

Abstract

The paper reports on a study of the kinetics of phase transformations during continuous cooling of the alpha-beta TÍ6A14V titanium alloy from theβ range. After cooling from 1020°C at a rate higher than critical the martensiticβ→α' transformation occurred. At rates lower than critical in addition to the martensitic reaction also the diffusional β→α transformation took place. Metallographic examination of samples cooled at various rates within the range of diffusional transformations, revealed variations in the α phase morphology changing from lamellar, after cooling at between 7.3 and 0.015°C/s, to granular, as observed after cooling at 0.012°C/s. The phase transformations were also clearly seen in dilatometric curves.