Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Reexamination Certificate
2011-07-26
2011-07-26
King, Roy (Department: 1733)
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
C148S525000, C148S421000, C148S526000
Reexamination Certificate
active
07985307
ABSTRACT:
Article (e.g., turbine engine fan or compressor blade) comprising a titanium alloy has a first portion with alpha+beta microstructure and a second portion with martensitic or a bimodal microstructure. The modified microstructure of the second portion is provided by selectively heating, and immediately quenching, the second portion without substantially heating the first portion. An exemplary method includes providing a near net-shaped article having a first portion (e.g., an airfoil region) and a second portion (e.g., an unfinished dovetail region). Initially, the article comprises an alpha+beta microstructure throughout. Thereafter, the second portion is selectively heated, followed by immediate quenching, without substantially heating the first portion, to modify the microstructure of the second portion to a martensitic or bimodal microstructure without substantially modifying the microstructure of the first portion. Thereafter, the second portion may be processed to a final body dimension.
REFERENCES:
patent: 6814818 (2004-11-01), Woodfield et al.
patent: 6814820 (2004-11-01), Ozbaysal
Venkatesh et al., An Experimental Investigation of Fretting Fatigue in Ti-6AI-4V: The Role of Contact Conditions and Microstructure, Metallurgical and Materials Transactions A, vol. 32A, May 2001, p. 1131-1146.
Houchens William
Miller William
Moses Jesse
Ozbaysal Kazim
General Electric Company
General Electric Company
King Roy
Louke Marcella R.
Roe Jessee R.
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