Low temperature forging process for Fe-Ni-Co low expansion alloys and product thereof
US5534085A · kind A · utility
1Cited by
13References
23Claims
0Family size
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Key dates
| Filing date | Apr 26, 1994 |
| Grant date | Jul 9, 1996 |
| Priority date | — |
| Expiry date | Apr 26, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC21D7/00
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of treating low-expansion Fe--Ni--Co superalloys is disclosed in which the alloys are forged at a temperature below the recrystallization temperature and then recrystallized without the use of intervening annealing steps. It is necessary that the warm forging step introduce sufficient strain throughout the Fe--Ni--Co superalloy such that after recrystallizing, the superalloy has a substantially uniform microstructure. Alloys produced by this method exhibit good hydrogen charging embrittlement resistance, good strength and/or rupture ductility in moist air.
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