Metal treatment – Process of modifying or maintaining internal physical... – Treating consolidated metal powder – per se
Patent
1994-07-07
1997-01-14
Engel, James
Metal treatment
Process of modifying or maintaining internal physical...
Treating consolidated metal powder, per se
148677, 148556, 419 29, 419 42, C22F 110
Patent
active
055935192
ABSTRACT:
A method of supersolvus 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 40 percent by volume of .gamma.'. The method permits the manufacture of large grain size forged articles having a grain size in the range of 50-150 .mu.m. The method comprises the selection of a fine-grained forging preform of a Ni-base superalloy. Supersolvus forging in the range of 0.degree.-100.degree. F. above the alloy solvus temperature then performed at slow strain rates in the range of 0.01-0.001 s.sup.-1. Subsequent supersolvus annealing followed by controlled cooling may be employed to control the distribution of the .gamma.', and hence influence the alloy mechanical and physical properties. The method may also be used to produce location specific grain sizes and phase distributions within the forged article.
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patent: 4685977 (1987-08-01), Chang
patent: 4820358 (1989-04-01), Chang
patent: 5302217 (1994-04-01), Gostic et al.
patent: 5393483 (1995-02-01), Chang
A Dictionary of Metallurgy; A. D. Merriman 1958 pp. 114-115.
Blankenship, Jr. Charles P.
Henry Michael F.
Engel James
General Electric Company
Johnson Noreen C.
Phipps Margery S.
Pittman William H.
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