Structure Evolution and Mechanical Properties of a Ti-6Al-4V Alloy During Helical Rolling and Subsequent Deformation and Heat Treatments

Resumo

The evolution of structure and strength properties of the Ti-6Al-4V alloy is investigated after helical rolling and subsequent groove rolling and annealing. It is shown that most significant structure refinement occurs in a material after sequential rolling treatments. In the rolled state the material achieves its maximum strength properties comparable to those of the alloy in an ultrafine-grained state. The structure and strength properties are observed to be stable up to the annealing temperature 873 K, which is 40 K higher than those in the ultrafine-grained alloy. The applicability of helical rolling and subsequent groove rolling followed by annealing is discussed in terms of improvement of the Ti-6Al-4V alloy properties.