Martensitic alloy conditioning
US3948688A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 1975 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Feb 28, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/006
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A two-stage process for conditioning an annealed martensitic alloy of titanium and nickel to improve its service life and provide enhanced elongation activity under high operating stress. In the first stage of the process, the alloy is maintained under a tensile stress sufficient to strain it beyond its plastic yield point while it is repeatedly thermally cycled in a primary temperature range between a lower temperature limit below the temperature at which conversion of martensite to austenite commences on heating and an upper temperature limit at least about equal to the temperature at which essentially all the martensite is converted to austenite on heating. In the second stage of the process, the alloy is maintained at a tensile stress sufficient to strain it beyond its plastic yield point while it is repeatedly thermally cycled in a secondary temperature range between a lower temperature limit equal to or higher than the temperature at which conversion of martensite to austenite commences on heating and an upper temperature limit equal to or lower than the temperature at which conversion of austenite to martensite commences on cooling. A novel product having enhanced service li…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.