METHOD OF ITEM PRODUCTION FROM TITANIUM ALPHA-BETA-ALLOY BY MEANS OF FORGING Russian patent published in 2008 - IPC B21K1/32 C22F1/18 

FIELD: technological processes.

SUBSTANCE: initial bar with thickness of at least around 20 inches from alloy on the basis of titanium is subsequently subjected to the first forging in the field of beta-phase and the second forging in the field of alpha-beta-phases. After subsequent heating of prepared billet to the temperature in the field of beta-phase the third forging is carried out with temperature from around 1550°F to around 1725°F. At that forging is performed from the first forging thickness of at least 15 inches to the second forging value of not more than 13 inches. For formation of semi-finished item the fourth forging is carried out in closed stamp with temperature from around 1550°F to around 1725°F. Then thermal treatment of semi-finished item is carried out. When manufacturing gas turbine disc after third forging billet is divided into sections with preparation of sectioned billet, which is further laminated.

EFFECT: preparation of large items with uniform fine-grained structure.

17 cl, 3 dwg