EP 0142668 B1 19870513 - PROCESS FOR THE PRODUCTION OF A FINE-GRAINED WORK PIECE OF A NICKEL BASE SUPERALLOY
Title (en)
PROCESS FOR THE PRODUCTION OF A FINE-GRAINED WORK PIECE OF A NICKEL BASE SUPERALLOY
Publication
Application
Priority
CH 525283 A 19830928
Abstract (en)
[origin: US4612062A] A fine-grained workpiece having improved mechanical properties is produced from a nickel-based superalloy by two-part forging, a blank being converted, in a first isothermal hot-forming step (curve b) above the solution-annealing temperature for the gamma '-phase (line a), into an intermediate form and the latter then being finally forged to give the end form in a second isothermal hot-forming step (curve c) just below the solution-annealing temperature for the gamma '-phase. For the first step, a degree of deformation epsilon of of at least 0.7 at a mean deformation rate epsilon of about 10x10-3s-1 is required here. The second step is carried out at deformation rates epsilon which are one to two powers of 10 lower than those of the first step.
IPC 1-7
IPC 8 full level
C22C 19/05 (2006.01); B21J 5/02 (2006.01); C22F 1/00 (2006.01); C22F 1/10 (2006.01)
CPC (source: EP US)
C22F 1/10 (2013.01 - EP US)
Citation (examination)
GB 1253861 A 19711117 - UNITED AIRCRAFT CORP [US]
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0142668 A1 19850529; EP 0142668 B1 19870513; CH 654593 A5 19860228; DE 3463677 D1 19870619; JP S6092458 A 19850524; US 4612062 A 19860916
DOCDB simple family (application)
EP 84111204 A 19840920; CH 525283 A 19830928; DE 3463677 T 19840920; JP 20209584 A 19840928; US 65555184 A 19840928