| Popis: |
In this paper the interrelation between the structure, hardness and strain resistance at 875 ∘C of the hot-forged pipe billet of the titanium alloy PT-7M (Ti-2.2Al-2.5Zr) was studied by the methods of macro, micro, XRDA, durometric analyzes and hot upsetting operation at 875 ∘C. It was found, that the volume fraction of the large grains reduced and recrystallized from the center to the surface of the pipe billet. As a result, hardness and strain resistance grew at 875 ∘C from the center to the surface of the billet. Keywords: titanium alloy PT-7M, hot deformation, phase composition, structure, texture, hardness, strain resistance. |
