Process for increasing the room-temperature ductility of a workpiece composed of an oxide-dispersion-hardened nickel based superalloy and existing as coarse, longitudinally oriented columnar crystallites
US4795507A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1987 |
| Grant date | Jan 3, 1989 |
| Priority date | — |
| Expiry date | Dec 10, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Process for increasing the room-temperature ductility of a workpiece composed of oxide-dispersion-hardened nickel-base superalloy and existing as coarse, longitudinally oriented columnar crystallites by subjecting the previously zone-annealed workpiece to a solution anneal in the temperature range between 1,160.degree. and 1,280.degree. C. under argon atmosphere for 1/2 h to 5 h and then to a purposefully chosen cooling down at a rate of 0.1.degree. C./min to 5.degree. C./min to a temperature of 500.degree. to 700.degree. C. Thereafter the workpiece is cooled down to room temperature in air. Preferred purposefully chosen cooling down rate: approx. 0.5.degree. C./min.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.