Heat treatment for improving fatigue properties of superalloy articles
US4820356A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1987 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | Dec 24, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/10
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Heat treatments are described for improving the fatigue properties of superalloy articles, without adversely affecting other mechanical properties. The entire heat treatment process is performed below the gamma prime solvus temperature so that significant grain growth does not occur. The heat treatment cycle causes the formation of gamma prime particles in a controlled manner and morphology, first at the grain boundaries and then within the grains. The resultant microstructure possesses the benefits of a fine grain structure (improved resistance to fatigue crack initiation) and fine gamma prime particle size (improved resistance to crack growth).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.