Nickel-cobalt based alloys

C - Chemistry – Metallurgy – 22 – C

Patent

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75/32, 148/34.8

C22C 19/00 (2006.01) C22C 30/00 (2006.01) C22F 1/10 (2006.01)

Patent

CA 2010081

ABSTRACT This invention relates to a nickel-cobalt alloy comprising the following elements in percent by weight Carbon about 0-0.05 Molybdenum about 6-11 Iron about 0 1 Titanium about 0-6 Chromium about 15-23 Boron about 0.005-0.020 Columbium about 1.1-10 Aluminum about 1.1-4.0 Cobalt about 30-60 Nickel balance the alloy having an electron vacancy number, Nv, defined by Nv = 0.61 Ni + 1.71 Co + 2.66 Fe + 4.66 Cr + 5066 Mo wherein the respective chemical symbols represent the effective atomic fractions of the respective elements present in the alloy, the value not exceeding the value Nv = 2.82 - 0.017 WFe, wherein WFe is the percent by weight of iron in the alloy. In one aspect, the alloy of the present invention is preferably finally cold worked at ambient temperature to a reduction in cross section of at least 5% and up to about 40%, although higher levels of cold work may be used with some loss of thermomechanical properties. However, it may be cold worked at any temperature below the HCP-FCC transformation zone. After cold working, the alloys are preferably aged at a temperature between about 800°F (427°C) to about 1400°F (760°C) for about 4 hours. Following aging, the alloys may be air-cooled. In another aspect, the alloy of the present invention is aged at a temperature of from about 1200°F (650°C) to about 1652°F (900°C) for about 1-200 hours and then cold worked at ambient temperature to achieve a reduction in cross-section of at least 5% and up to about 40%. After cold working, the alloys are preferably aged at a temperature of from about 800°F (427°C) to about 1400°F (760°C) for about 4 hours. Following aging, the alloys may be air-cooled. a:E4MCM2.wpf 16

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