Method for heat treating iron-nickel-chromium alloy

Details Method for heat treating iron-nickel-chromium alloy Method for heat treating iron-nickel-chromium alloy

1980-04-03

1982-11-16

Dean, R.

Metal treatment

Compositions

Heat treating

148 127R, 148 127N, 148 31, 148405, C21D 714

Patent

active

043593496

ABSTRACT:
A method for heat treating an age-hardenable iron-nickel-chromium alloy to obtain a bimodal distribution of gamma prime phase within a network of dislocations, 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 results, the alloy is heated to a temperature of 1025.degree. C. to 1075.degree. C. for 2-5 minutes, cold-worked about 20% to 60%, aged at a temperature of about 775.degree. C. for 8 hours followed by an air-cool, and then heated to a temperature in the range of 650.degree. C. to 700.degree. C. for 2 hours followed by an air-cool.

REFERENCES:
patent: 3046108 (1962-07-01), Eiselstein
patent: 4236943 (1980-12-01), Korenko et al.
Nimonic Alloy PE16, Publication 3349A, Jan., 1968, pp. 1-28, Henry Wiggin and Company Limited, Hereford, England.

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