All-Russian Scientific Research Institute of Aviation Materials, Moscow, Russia:
D. I. Dinmukhametova, Engineer
N. A. Nochovnaya, Head of Laboratory, e-mail: nochovnaya_viam@mail.ru
E. N. Tarasenko, Leading Engineer

The main properties of half-finished titanium product are mainly estimated by fabrication technique. This is connected with a structure, formed during the hot deformation and heat treatment, making an influence on properties (especially on properties of high-strength titanium alloys). Researches were carried out on plates, manufactured by original technology in conditions of “VSMPO-AVISMA” Corporation. Technology of high-strength titanium half-finished products fabrication includes the basic stages: cast structure grinding by uniform beta-deformation; deformation in (α + β)-area for obtaining of hot-cold work; heating and deformation in β-area for recrystallization process; and final (α + β)-deformation. Due to the type of half-finished product and structural and property requirements, the foregoing stages can be repeated several times, which leads to intensification of recrystallization process and helps to obtain a fine-grained and homogeneous macro- and microstructure. Content of oxygen, carbon, hydrogen and nitrogen was defined in researched smelting samples. Being the (α + β)-alloy, VT43 (ВТ43) alloy was hardened by heat treatment, which basic purpose is saving of metastable β-, α'- and α''-phases by rapid cooling and their following decomposition in the time of aging with precipitation of α- and β-phases. At the same time, the hardening effect is better, with increased amount and dispersion of metastable phases, fixed after rapid cooling. The structure and phase composition of samples after quenching and aging was studied. Mechanical tests were carried out. There is shown that application of optimal heat treatment provides the obtaining of ultimate strength of not lesser than 1200 MPa.

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