METHOD OF MANUFACTURE OF INTERMEDIATE BLANK FROM α- OR α+β-TITANIUM ALLOYS Russian patent published in 2008 - IPC C22F1/18 B21J1/04 

FIELD: manufacture of intermediate blanks from α- and α+β-titanium alloys by hot deformation method.

SUBSTANCE: proposed method includes forging an ingot into bar during several passes at temperature of β- and (α+β) field. Then, blank is subjected to machining and two-stage heating. At the first stage, blank is heated to temperature of its surface which is below polymorphous transformation temperature by 250 C and is above polymorphous transformation temperature by 100 C; heating is performed at rate of 0.3-2.5°C/s. At the second stage, blank is cooled down or heated to temperature which is below polymorphous transformation temperature by 40-250 C. Final molding is performed in (α+β) field at forging reduction ratio at last passes of 1.36-2.5.

EFFECT: reduction of blank heating time to molding temperature; increased productivity; possibility of obtaining fine-grain structure of blank metal.

2 cl, 3 ex