Method of making high strength articles from forged powder steel

Details Method of making high strength articles from forged powder steel Method of making high strength articles from forged powder steel

1990-06-08

1991-04-23

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Post sintering operation

419 26, 419 29, 419 36, 419 37, 419 38, 419 54, 419 57, 419 58, B22F 324

Patent

active

050098420

ABSTRACT:
High strength steel parts or articles are made from a powder alloy by compacting the powder into a preform, sintering the preform in a sintering furnace or the like under a highly-reducing atmosphere and at a temperature of at least 1150.degree. C., cooling the preform, preheating the sintered preform in a highly-reducing atmosphere, such as an inert gas-based atmosphere containing hydrogen or pure hydrogen, to a temperature of at least 1000.degree. C. and transferring the preheated preform to an impact forging device and impacting the preform at a peak averaging forging pressure of at least about 1000 MPa to obtain a forged part or article. The time period between removal of the preheated preform from the preheater and the first forging impact is no more than about 8 seconds. The sintering and preheating steps can be combined with the sintered preform being cooled to the preheating temperature in the sintering furnace and transferred directly from the sintering furnace to the impact forging device.

REFERENCES:
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patent: 4002471 (1977-01-01), Sarnes et al.
patent: 4165243 (1979-08-01), Sarnes et al.
patent: 4587096 (1986-05-01), Mankins et al.
patent: 4693864 (1987-09-01), Lloyd
patent: 4756677 (1988-07-01), Hribernik et al.
patent: 4879091 (1989-11-01), Samal et al.

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