Heat treatment for nickel-base alloys
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United States of America Patent
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Nov 13, 2001
Issued Date -
N/A
app pub date -
Mar 2, 2000
filing date -
Jul 9, 1998
priority date (Note) -
Expired
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Abstract
A heat treatment for hot or cold worked 725 corrosion resistant Ni-base alloys to increase the room temperature yield strength of the material to above about 140 ksi (965 MPa). The material is useful for oil patch and gas turbine applications. The process includes annealing the material at about 1825.degree. F. (996.degree. C.) for about 1.5-4 hours, age hardening the material at about 1400.degree. F. (760.degree. C.) for about 3.0 to 10.5 hours to precipitate double gamma prime, furnace cooling the material about 50.degree. F. (28.degree. C.) to 100.degree. F. (56.degree. C.) per hour and heat treating the material at about 1200.degree. F. (649.degree. C.) for about 4.0 to about 12.5 hours.
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