METHODS DEVELOPMENT FOR INCREASING MECHANICAL CHARACTERISTICS DURING DEFORMATION OF TITANIUM ALLOYS WITH ENERGY COSTS MINIMIZATION

The article dials with the improving study the plastic characteristics of titanium alloys VT1-0 and VT6.It was shown that the use of electron beam melting (ELB) allows to obtain alloys with a high level of purity, which improves their deformability and plasticity. Energy- and resource-saving processing technologies were presented, which allows to significantly increasing the mechanical characteristics compared to the vacuum-arc method. Increasing methods plasticity and others mechanical characteristics of VT1-0 and VT6 titanium alloys melted by electron beam melting (ELF) are given. This method is used in Ukraine and abroad for the production of titanium alloys used in nuclear power, the working blades production of steam turbines, heat exchange equipment, as well as fuel tanks and elements of rocket engines. Optimum temperature-time regimes for increasing the plasticity of alloys were established, which included a decrease in the temperature of the polymorphic transitions beginning. At the same time were set decrease in energy consumption, and a reduction in processing time. The use of a new deformation scheme on large ingots with a 640 mm diameter made it possible to minimize metal loss and achieve a fine-grained structure with improved characteristics. The results showed that titanium alloys melted by the ELP method have better mechanical properties characteristics compared to analogs of vacuum-arc remelting. It was established that the use of the β-phase contributes to a significant improvement in the deformability of alloys due to the plastic β-layers. The obtained data confirm the development new processing technologies perspective and thermal processing of titanium alloys. It could be to increase their competitiveness in high-tech industries.