Phase evolution of Ti-6Al-4V during continuous heating

The (alpha+beta)-->beta transformation in Ti-6Al-4V (Ti-6-4) has been studi ed with the alloy subjected to constant rate heating. A heat-flux different ial scanning calorimeter (DSC) was used to record the thermal behaviour of the transformation. Microstructures at different stages of this transformat ion have been observed using optical microscopy and scanning electron micro scopy (SEM). Results show that the (alpha+beta)-->beta phase transformation includes two stages, alpha in transformed beta-->beta and primary alpha--> beta. Tn addition, activation energy value related to the primary alpha-->b eta transformation in Ti-6-4 alloy was evaluated. (C) 1999 Elsevier Science S.A. All rights reserved.