Isothermal and high retained strain forging of Ni-base superallo

Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal

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148677, 419 28, 419 29, 419 32, 72709, 723425, 72356, C22F 110, B22F 300

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060599049

ABSTRACT:
A method combining isothermal and 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 40 percent by volume of .gamma.'. The method permits the manufacture of forged articles having a fine grain size in the range of 20 .mu.m or less. The method comprises the selection of a fine-grained forging preform formed from a Ni-base superalloy, isothermal forging to develop the shape of the forged article, subsolvus forging to impart a sufficient level of retained strain to the forged article to promote subsequent recrystallization and avoid critical grain growth, and annealing to recrystallize the microstructure. The method permits the forging of relatively complex shapes and avoids the problem of critical grain growth. The method may also be used to produce location specific grain sizes and phase distributions within the forged article.

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ASM Handbook vol. 14 pp. 261-266, Apr. 1988.
"Isocon Manufacturing of Waspaloy Turbine Discs", Douglas P. Stewart, Ladish Co., Inc. Cudahy, WI, pp. 545-551 1989.

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