Method for improving fatigue properties in castings
US4171562A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1977 |
| Grant date | Oct 23, 1979 |
| Priority date | — |
| Expiry date | Oct 7, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49993
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method for producing cast, superalloy, ferrous and titanium articles comprising the formation of a material void in the cast article, for example by utilizing a core during the casting operation or by machining a void after casting. The void is sealed relative to the surrounding atmosphere and the article is then subjected to an elevated temperature and pressure treatment in a gaseous atmosphere whereby the metal in the area of the void will yield so that the void is partially or totally eliminated. The pressure application is carried out at a temperature such that local deformation of the cast structure occurs in the region previously occupied by, and adjacent to, the void whereby a fine-grained recrystallized structure is developed in this section. Grain refined cast articles are characterized by superior low-cycle fatigue and tensile properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.