Thermomechanical method for producing superalloys with increased strength and thermal stability
US6334912B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 1998 |
| Grant date | Jan 1, 2002 |
| Priority date | — |
| Expiry date | Dec 31, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A thermomechanical process for producing high strength and thermally stable alloys, comprising the steps of: pre-heating an alloy bar or rod stock of a pre-selected size at a temperature below that at which grain growth occurs; and thereafter rotoforging the heated alloy bar or rod stock at a sufficient deformation level and temperature to fragment the grain boundary phases of the alloy. The resulting alloy is characterized by an ultra-fine, very uniform grain size, high tensile strength at room and high temperatures, good ductility, and a stress-rupture rate that is about twice as long as conventional alloys that have not undergone the thermomechanical process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.