Metallurgical method for processing nickel- and iron-based superalloys
US6129795A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1998 |
| Grant date | Oct 10, 2000 |
| Priority date | — |
| Expiry date | Aug 3, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D8/0273
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method is provided for improving the microstructure of nickel and iron-based precipitation strengthened superalloys used in high temperature applications by increasing the frequency of "special", low-.SIGMA. CSL grain boundaries to levels in excess of 50%. Processing entails applying specific thermomechanical processing sequences to precipitation hardenable alloys comprising a series of cold deformation and recrystallization-annealing steps performed within specific limits of deformation, temperature, and annealing time. Materials produced by this process exhibit significantly improved resistance to high temperature degradation (eg. creep, hot corrosion, etc.), enhanced weldability, and high cycle fatigue resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.