Method for controlling grain size in Ni-base superalloys
US5649280A · kind A · utility
48Cited by
8References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Jan 2, 1996 |
| Grant date | Jul 15, 1997 |
| Priority date | — |
| Expiry date | Jan 2, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C1/0433
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of high retained strain forging is described for Ni-base superalloys, particularly those which comprise a mixture of .gamma. and .gamma.' phases, and most particularly those which contain at least about 30 percent by volume of .gamma.'. The method utilizes an extended subsolvus anneal to recrystallize essentially all of the superalloy and form a uniform, free grain size. Such alloys may also be given a supersolvus anneal to coarsen the grain size and redistribute the .gamma.'. The method permits the manufacture of forged articles having a fine grain size in the range of about ASTM 5-12 (5-60 .mu.m).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.