Method for heat treating iron-nickel-chromium alloy

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863663

Korenko, Michael K ^[1]

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1. Richland, WA

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, 0.3 to 0.75% silicon, 1 to 3% titanium, 0.1 to 0.5% aluminum, 0.02 to 1% carbon, 0.002 to 0.0015% boron and the remain substantially all iron. To obtain optimal results, the alloy is cold-worked 20 to 60% followed by heating at 1050.degree. C. for 1/2 hour with an air-cool plus heating at 800.degree. C. for 2 hours with a furnace cool to 625.degree. C. The alloy is then held at 625.degree. C. for 12 hours, followed by an air-cool.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
• DOE Contract Number: E(45-1)-2170
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4225363
• OSTI ID: 863663
• Country of Publication: United States
• Language: English

Related Subjects

method
heat
treating
iron-nickel-chromium
alloy
age-hardenable
obtain
morphology
gamma-double
prime
phase
enveloping
gamma-prime
consisting
essentially
40
50
nickel
14
chromium
niobium
75
silicon
titanium
aluminum
02
carbon
002
0015
boron
remain
substantially
iron
optimal
results
cold-worked
20
60
followed
heating
1050
degree
hour
air-cool
plus
800
hours
furnace
cool
625
held
12
iron-nickel-chromium alloy
consisting essentially
heat treating
remain substantially
gamma-double prime
alloy consisting
prime phase
chromium alloy
phase enveloping
treating iron-nickel-chromium
gamma-prime phase
age-hardenable iron-nickel-chromium
/148/