EP 0274631 B1 19910306 - PROCESS FOR INCREASING THE ROOM TEMPERATURE DUCTILITY OF AN OXIDE DISPERSION HARDENED NICKEL BASE SUPERALLOY ARTICLE HAVING A COARSE COLUMNAR GRAIN STRUCTURE DIRECTIONALLY ORIENTED ALONG THE LENGTH
Title (en)
PROCESS FOR INCREASING THE ROOM TEMPERATURE DUCTILITY OF AN OXIDE DISPERSION HARDENED NICKEL BASE SUPERALLOY ARTICLE HAVING A COARSE COLUMNAR GRAIN STRUCTURE DIRECTIONALLY ORIENTED ALONG THE LENGTH
Publication
Application
Priority
CH 511186 A 19861219
Abstract (en)
[origin: US4795507A] Process for increasing the room-temperature ductility of a workpiece composed of oxide-dispersion-hardened nickel-base superalloy and existing as coarse, longitudinally oriented columnar crystallites by subjecting the previously zone-annealed workpiece to a solution anneal in the temperature range between 1,160 DEG and 1,280 DEG C. under argon atmosphere for 1/2 h to 5 h and then to a purposefully chosen cooling down at a rate of 0.1 DEG C./min to 5 DEG C./min to a temperature of 500 DEG to 700 DEG C. Thereafter the workpiece is cooled down to room temperature in air. Preferred purposefully chosen cooling down rate: approx. 0.5 DEG C./min.
IPC 1-7
IPC 8 full level
C22C 1/10 (2006.01); C22C 19/05 (2006.01); C22C 32/00 (2006.01); C22F 1/00 (2006.01); C22F 1/10 (2006.01)
CPC (source: EP US)
C22C 1/10 (2013.01 - EP US); C22C 32/0026 (2013.01 - EP US); C22F 1/10 (2013.01 - EP US)
Citation (examination)
J.S. Benjamin, Metall. Trans. 1970,1,p. 2943 to 2951; M.Y. Nazmy, R.F. Singer, Scripta Metallurgica, 1985, Vol. 19, p. 829 to 832; T.K. Glasgow, Nasa TM-78973 (1978)
Designated contracting state (EPC)
CH DE FR GB LI
DOCDB simple family (publication)
EP 0274631 A1 19880720; EP 0274631 B1 19910306; CH 671583 A5 19890915; DE 3768464 D1 19910411; JP S63162846 A 19880706; US 4795507 A 19890103
DOCDB simple family (application)
EP 87117524 A 19871127; CH 511186 A 19861219; DE 3768464 T 19871127; JP 31433587 A 19871214; US 13136187 A 19871210