Production of high density powdered metal parts

Details Production of high density powdered metal parts Production of high density powdered metal parts

1975-07-23

1977-02-01

Schafer, Richard E.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

294205, 75200, 75226, B22F 314, C22C 104, B22F 316

Patent

active

040060160

ABSTRACT:
A process of forming powdered metal into finished or near-finished, high-strength, structural parts of complex configurations wherein a metal powder preform is heated to a temperature of approximately 2100.degree. F and formed at relatively low pressures in the range of approximately 19 to 39 tons per square inch over a short contact time interval in a preheated forming die composed of a high temperature, high strength superalloy to produce a metal part having a density of 99+% of theoretical density. The preform is formed from a prealloyed metal powder blended with graphite and a lubricant, compacted to a density in the range of 70 to 80% of theoretical density, and heat treated for oxide reduction and solutioning of the graphite therein. The preform must be rapidly transferred from the heat treatment operation to the preheated forming die to minimize reoxidation and cooling of the preform.

REFERENCES:
patent: 3720512 (1973-03-01), Yamaguchi et al.
Brown, G. T. et al., "Experimental and Practical Aspects of the Powder Forging Process" in Int. J. Pow. Met. 6(4): pp. 29-42, Oct., 1970.
Hirschorn, J. S. et al., "The Forging of Powder Metal Preforms," In Metal Forming 37(11): pp. 320-327, Nov., 1970.
Pietrocini, T. W. et al., "Fatigue and Toughness of Hot Formed Cr-Ni-Mo and Ni-Mo Prealloyed Steel Powders," in Int. J. Pow. Met. 6(4): pp. 19-25, Oct., 1970.
Lally, F. T. et al., Isothermal Forging of Precision Metal Powder Components, Report No. R-RR-T-6-95-73 (AD-780-044) Available NTIS, Dec., 1973.

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