Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1995-10-26
1997-08-05
Sheehan, John
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148669, 419 29, C22F 118
Patent
active
056538286
ABSTRACT:
A method for producing fine-grained lamellar microstructures in powder metallurgy (P/M) and wrought gamma titanium aluminides comprises the steps of: (a) a cyclic heat treatment at a maximum temperature in the range of about 10.degree. C. above to about 10.degree. C. below the alpha-transus temperature (T.sub..alpha.) of the alloy, and (b) a secondary heat treatment of thus cyclically heat treated alloy at a temperature between 750.degree. C. and 1050.degree. C. for 4 to 100 hours. For cast gamma alloys, the method comprises additionally the step of a solution treatment at a temperature in the range of about 30.degree. C. to 70.degree. C. above T.sub..alpha. followed by a water or an oil quench before the two steps described above. The alloys with the resulting fine-grained lamellar microstructure have an advantageous combination of mechanical properties--tensile strength, ductility, fracture toughness, and creep resistance.
REFERENCES:
patent: 5226985 (1993-07-01), Kim et al.
patent: 5296055 (1994-03-01), Matsuda
patent: 5417781 (1995-05-01), McQuay et al.
Au Peter
Beddoes Jonathan C.
Wallace William
Zhao Linruo
National Research Council of Canada
Sheehan John
Szereszewski Juliusz
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