Low temperature forging process for Fe-Ni-Co low expansion alloy

Details Low temperature forging process for Fe-Ni-Co low expansion alloy Low temperature forging process for Fe-Ni-Co low expansion alloy

1994-04-26

1996-07-09

Yee, Deborah

Metal treatment

Stock

Ferrous

148328, 148419, 148707, 148649, C22C 3852, C22C 3000, C21D 800

Patent

active

055340857

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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