Fine grain titanium forgings and a method for their production
US5026520A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 23, 1989 |
| Grant date | Jun 25, 1991 |
| Priority date | — |
| Expiry date | Oct 23, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/183
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Fine grain titanium forgings and to a process for refining the grain size of .alpha. and .alpha.-.beta. titanium alloys through forging and recrystallization above the alloy's .beta.-transus temperature. Specifically, the method employs an isothermal press in which a billet heated above the alloy's .beta.-transus temperature, forged to produce an elongated, flattened grain structure, is held above the alloy's .beta.-transus temperature for a predetermined time to allow fine grains to nucleate and grow through recrystallization, and then is quenched to arrest grain growth and to establish a fine grained titanium alloy. A second forging step may be employed to attain an aspect ratio of the grains. The fine grained titanium forgings made by this process have a maximum prior .beta.-grain size of 0.5 mm throughout the workpiece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.