METHOD OF THE THERMOMECHANICAL PROCESSING OF THE ARTICLES MADE OUT OF THE TITANIUM ALLOYS Russian patent published in 2008 - IPC C22F1/18 

FIELD: aerospace industry; rocket industry; other industries; methods of the thermomechanical processing of the articles made out of the titanium alloys.

SUBSTANCE: the invention is pertaining to the field of nonferrous metallurgy, in particular, to the thermomechanical processing of the articles made out of the titanium alloys and may be used in the aeronautical engineering and rocketry for production of the containers, girders, longerons, bulkheads, landing gear and fastening components. The invention presents the method intended to up-grade the level of the mechanical processing of the articles, which provides for the thermomechanical processing of the articles made out of the titanium alloys, including their multiple heatings up to the temperature of above or below the temperature of the polymorphic transformation T_tp and deformation. The thermomechanical processing includes seven phases. The first phase includes the heating of the titanium alloy up to the temperature of(T_tp+200÷T_tp+270)°С, its deformation within four runs with the change of the deformation direction by 90°C at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run of the deformation; at the second phase - they exercise heating up to the temperature of(T_tp+170÷T_tp+230)°С, the deformation in four runs with the change of the deformation direction by 90°С at alternation of the yielding and drawing with the deformation level of 20÷40 % at each run of the deformation; at the third phase - heating up to the temperature of (T_tp-20÷T_tp-40)°С, the deformation by yielding with the level of 20-60%; at the fourth phase - heating up to the temperature of(T_tp + 60 ÷ T_tp + 120)°С, deformation with the level of 20-60%; at the fifth phase - heating up to the temperature of(T_tp -20 ÷ T_tp-40)°С, the deformation with the level of 20-60 %; at the sixth phase - heating up to the temperature of (T_tp +30 ÷ T_tp +90)°С, the deformation with the level of 20-60 %; at the seventh phase - heating up to the temperatures of(T_tp -20 ÷ T_tp -40)°С, the deformation with the level of 20-50 %.

EFFECT: the invention ensures the increased level of the mechanical properties of the articles made out of the titanium alloys.

2 cl, 1 tbl, 3 ex