C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/48
C21D 8/00 (2006.01) C22C 19/05 (2006.01) C22F 1/10 (2006.01)
Patent
CA 1123720
47,090 METHOD FOR HEAT TREATING IRON-NICKEL-CHROMIUM ALLOY ABSTRACT OF THE DISCLOSURE A method for heat treating an age-hardenable iron- nickel-chromium alloy to obtain a morphology of the gamma- double prime phase enveloping the gamma-prime phase, the alloy consisting essentially of about 40 to 50% nickel, 7.5 to 14% chromium, 1.5 to 4% niobium, .3 to .75% silicon, 1 to 3% titanium, .1 to .5% aluminum, .02 to 1% carbon, .002 to .015% boron and the remain substantially all iron. To obtain optimal results, the alloy is cold-worked 20 to 60% followed by heating at 1050°C for 1/2 hour with an air-cool plus heat- ing at 800°C for 2 hours with a furnace cool to 625°C. The alloy is then held at 625°C for 12 hours, followed by an air-cool.
315170
Mcconnell And Fox
Westinghouse Electric Corporation
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