EP 1507017 A1 20050216 - A method of heat treating titanium aluminide
Title (en)
A method of heat treating titanium aluminide
Title (de)
Verfahren zur Wärmebehandlung von TiAl-Legierungen
Title (fr)
Procédé pour le traitement thermique des alliages de TiAl
Publication
Application
Priority
GB 0319061 A 20030814
Abstract (en)
A gamma titanium aluminide alloy consisting of 46at% aluminium, 8at% niobium, up to 0.07at% carbon and the balance titanium plus incidental impurities has an alpha transus temperature T alpha = 1335 DEG C. The gamma titanium aluminide alloy was heated to a temperature T1 = 1360 DEG C and was held at T1 = 1360 DEG C for 1 hour or longer. The gamma titanium aluminide alloy was fluidised bed, or salt bath, quenched to a temperature T2, where 900 DEG C < T2 < 1200 DEG C, and was held at temperature T2 for a sufficient time to allow the massive transformation to go to completion. The gamma titanium aluminide alloy was heated to a temperature T3 = 1300 DEG C or 1320 DEG C and was held at T2 for 4 hours. The gamma titanium aluminide alloy was air cooled to ambient temperature. The gamma titanium aluminide alloy has a fine duplex microstructure comprising differently orientated alpha plates in a massively transformed gamma matrix. The heat treatment reduces quenching stresses, allows larger castings and a broader range of titanium aluminide alloys to be grain refined. <IMAGE>
IPC 1-7
IPC 8 full level
C22F 1/18 (2006.01)
CPC (source: EP US)
C22F 1/183 (2013.01 - EP US)
Citation (search report)
[DPA] EP 1378582 A1 20040107 - ROLLS ROYCE PLC [GB]
Citation (examination)
- JP H06116691 A 19940426 - MITSUBISHI MATERIALS CORP
- US 5205875 A 19930427 - HUANG SHYH-CHIN [US]
- EP 1308529 A1 20030507 - MITSUBISHI HEAVY IND LTD [JP]
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 1507017 A1 20050216; GB 0319061 D0 20030917; US 2005081967 A1 20050421
DOCDB simple family (application)
EP 04254344 A 20040721; GB 0319061 A 20030814; US 91352804 A 20040809