Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Controlled cooling after sintering
Patent
1996-01-02
1997-07-15
Jordan, Charles T.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Controlled cooling after sintering
419 29, 419 41, 419 54, 419 55, B22F 324, C22C 104
Patent
active
056492804
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).
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Duk N. Yoon et al. "Method for Minimizing Nonuniform Nucleation and Supersolvus Grain Growth In A Nickel-Base Superalloy". Ser. No. 08/323,969, filed Oct. 17, 1994. (13DV-11903.).
Blankenship Charles Philip
Henry Michael Francis
Huron Eric Scott
Hyzak John Michael
General Electric Company
Jenkins Daniel
Johnson Noreen C.
Jordan Charles T.
Pittman William H.
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