Controlled thermal expansion superalloy
US5439640A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Sep 3, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C38/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention provides a controlled coefficient of thermal expansion alloy having in weight percent about 26-50% cobalt, about 20-40% nickel, about 20-35% iron, about 4-10% aluminum, about 0.5-5% niobium plus 1/2 of tantalum weight percent and about 1.5-10% chromium. Additionally the alloy may contain about 0-1% titanium, about 0-0.2% carbon, about 0-1% copper, about 0-2% manganese, about 0-2% silicon, about 0-8% molybdenum, about 0-8% tungsten, about 0-0.3% boron, about 0-2% rhenium, about 0-2% hafnium, about 0-0.3% zirconium, about 0-0.5% nitrogen, about 0-1% yttrium, about 0-1% lanthanum, about 0-1% total rare earths other than lanthanum, about 0-1% cerium, about 0-1% magnesium, about 0-1% calcium, about 0-4% oxidic dispersoid and incidental impurities. The alloy may be further optimized with respect to crack growth resistance by annealing at temperature below about 1010.degree. C. or temperatures between 1066.degree. C. or 1110.degree. C. and the melting temperature and by aging at a beta precipitation temperature greater than about 788.degree. C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.