PRECIPITATION HARDENABLE IRON-NICKEL-CHROMIUM ALLOY HAVING GOOD SWELLING RESISTANCE AND LOW NEUTRON ABSORBENCE

摘要

47,104 PRECIPITATION HARDENABLE IRON-NICKEL-CHROMIUM ALLOY HAVING GOOD SWELLING RESISTANCE AND LOW NEUTRON ABSORBENCE An iron-nickel-chromium age-hardenable alloy suitable for use in fast breeder reactor ducts and cladding which utilizes the gamma-double prime strengthening phase and characterized in having a morphology of the gamma-double prime phase enveloping the gamma-prime phase and delta phase distributed at or near the grain boundaries. The alloy consists essentially of about 40-50% nickel, 7.5-14% chromium, 1.5-4% niobium, .25-.75% silicon, 1-3% titanium, .1-.5% aluminum, .02-.1% carbon, .002-.015% boron, and the balance iron. Up to 2% manganese and up to .01% magnesium may be added to inhibit trace element effects; up to .1% zirconium may be added to increase radiation swelling resistance; and up to 3% molybdenum may be added to increase strength.