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

FIELD: nonferrous metallurgy; aircraft 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. The invention presents the method of thermomechanical processing of the articles made out of the titanium alloys providing for their multiple heatings up to the temperature of above or below the temperature of the polymorphic transformation T_tp and deformation in the process of cooling to the temperature below T_tp, aging and cooling. The thermomechanical processing includes eight phases. The first phase includes the heating of the titanium alloy up to the temperature of (T_tp+280÷T_tp+350)°С, its deformation within four runs at cooling up to the temperature of (T_tp-4О÷T_tp-100)°С with the change of the deformation direction by 90° at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run; at the second phase - exercise heating up to the temperature of(T_tp+100÷T_tp+160)°С, the deformation in four runs at cooling to the temperature of (T_tp-100÷T_tp-180)°С with the change of the deformation direction by 90°С at alternation of the yielding and drawing with the deformation level of 20÷50 % at each run; 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% in the process of cooling to the temperature of (T_tp-110 ÷ T_tp -130)°С; at the fourth phase - heating up to the temperature of(T_tp + 20÷T_tp -50)°С, deformation by drawing with the level of 30-70% in the process of cooling to the temperature of(T_tp -110 ÷ T_tp-130)°С; at the fifth phase - heating up to the temperature of(T_tp -20 ÷ T_tp-40)°С, the deformation by yielding of with the level of 20-60 % in the process of cooling to the temperature of(T_tp -110 ÷ T_tp -130)°С; at the sixth phase - heating up to the temperature of (T_tp +100 ÷ T_tp +130)°С, the deformation by drawing at the rolling with the level of 55-80 %; at the seventh phase - heating up to the temperatures of(T_tp -20 ÷ T_tp -40)°С, the deformation by drawing at the rolling with the level of 30-40 %; at the eighth stage - heating up to the temperature of(T_tp -360 ÷ -500)°С with the aging for 5-20 hours. The technical result of the invention is the increased level and the decreased anisotropia of the mechanical properties of the articles.

EFFECT: the invention ensures the increased level and the decreased anisotropia of the mechanical properties of the articles.

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