Abstract:

The direct aged (DA) processing has become the basic processing technology to produce GH4169 alloy disk forgings for high performance aeroengines. During the DA processing, however, it is necessary to strictly control every step of forging process and employ the forging equipment with enough capacity. Referring to the finish forging process of DA processing in forging press, the upsetting processes of GH4169 billet with 520mm diameter and 190mm height under several conditions were simulated by coupled thermomechanical finite element method. The results of numerical simulation indicate that in order to obtain high quality GH4169 alloy disk forgings, it is necessary to determine the ram velocity reasonably, improve the lubrication condition and raise the dies temperature appropriately. For the GH4169 alloy disk forgings, the isothermal DA forging process may be the best choice. The results of this study may provide a guide for DA processing of GH4169 alloy disk forgings at home.

Key words: GH4169 alloy, direct-aged processing, forging, numerical simulation