The Effect of Hot Deformation Parameters on Microstructure Evolution of the α-Phase in Ti-6Al-4V

Perumal, Bama; Rist, Martin A.; Gungor, Salih; Brooks, Jeffery W. and Fitzpatrick, Michael E. (2016). The Effect of Hot Deformation Parameters on Microstructure Evolution of the α-Phase in Ti-6Al-4V. Metallurgical and Materials Transactions A, 47(8) pp. 4128–4136.

DOI: https://doi.org/10.1007/s11661-016-3552-1

Abstract

The effect of high-temperature deformation and the influence of hot working parameters on microstructure evolution during isothermal hot forging of Ti-6Al-4V in the alpha phase field were investigated. A series of hot isothermal axis-symmetric compression tests were carried out at temperatures both low and high in the alpha stability field [(1153 K and 1223 K (880 °C and 950 °C), respectively], using three strain rates (0.01, 0.1 and 1.0/s) relevant to industrial press forging. The microstructures and orientation of the alpha laths were determined using optical microscopy and electron backscatter diffraction techniques. The experimental results show that there is a change in lath morphology of the secondary α phase under the influence of the deformation parameters, and that α lath thickness appears to have little influence on flow behavior.