C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/31
C21D 6/00 (2006.01) C21D 8/00 (2006.01) C22C 38/44 (2006.01) C22C 38/48 (2006.01) C22C 38/50 (2006.01)
Patent
CA 1133363
13 47,107I ABSTRACT OF THE DISCLOSURE A method for heat treating an age-hardenable iron-nickel-chromium alloy to obtain a bimodal distri- bution of gamma prime phase within a network of dis- locations, the alloy consisting essentially of about 25% to 45% nickel, 10% to 16% chromium, 1.5% to 3% of an element selected from the group consisting of molybdenum and niobium, about 2% titanium, about 3% aluminum and the remainder substantially all iron. To obtain optimum re- sults, the alloy is heated to a temperature of 1025°C to 1075°C for 2-5 minutes, cold-worked about 20% to 60%, aged at a temperature of about 775°C for 8 hours followed by an air-cool, and then heated to a temperature in the range of 650°C to 700°C for 2 hours followed by an air- cool.
352685
Korenko Michael K.
Merrick Howard F.
Mcconnell And Fox
Westinghouse Electric Corporation
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