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The paper provides the results of statistical research of the mechanical properties of deformed semi-finished titanium alloys Ti-6Al-4V and Ti-10V-2Fe-3Al, based on the industrial data analysis. The research objects were 1.635 forging products, made of the alloys ВТ6 (Ti-6Al-4V) and Ti-10-2-3 (Ti-10V-2Fe-3Al), manufactured in compliance with the industrial technology. The statistical research conducted with the help of the applied software package "Stadia 7" included the primary statistical manipulation and a correlation-regression analysis with the help of standard methods. The authors established correlation relationships between the mechanical properties of such semi-finished products containing alloying elements, admixtures and the industrial modes of the strengthening heat treatment. It was revealed that the variations in the grade composition, hardening and aging temperature can determine 10-40% of variable forging mechanical properties. The key variation is pre-determined by the factors the authors failed to identify on the basis of the data research.

UDC 669.295Statistical studies on the stability of the mechanical properties of various semifinished products made from Ti-6Al-4V alloys depending on the content of alloying elements and impurities after annealing under factory conditions have been conducted. Results show that the influence of each alloying element and impurity may be insignificant, but their combined effect in terms of aluminum and molybdenum equivalents leads to a significant variation in properties. The influence of the chemical composition in terms of aluminum and molybdenum equivalents, as well as simple annealing modes, the difference between the polymorphic transformation temperature and annealing temperature, and the diameter of rolled rods of 15-150 mm on the mechanical properties of the titanium alloy VT6 has also been examined. Based on the probabilistic approach, recommendations have been provided to improve the stability of the properties of VT6 alloy rolled rods and eliminate defective products by adjusting the annealing modes depending on the content of alloying elements and impurities.