Grain size control of metallic materials by inert gas doping

Details Grain size control of metallic materials by inert gas doping Grain size control of metallic materials by inert gas doping

1994-01-11

1995-04-18

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

419 42, 75228, 75950, B22F 312

Patent

active

054076340

ABSTRACT:
A method of inhibiting grain growth and restricting grain size during heat-treatment and hot-working of metallic materials. A small volume of inert gas is added to a metallic material so that the inert gas is dispersed throughout the metallic material. The metallic material is then heated sufficiently high so that the inert gas forms micropores within the metallic material; the micropores interact with grain boundaries to inhibit grain growth. If desired, all or part of the residual microporosity may be eliminated from the metallic material during the final step of a deformation processing cycle.

REFERENCES:
Hausner et al, "Modern Developments in Powder Metallurgy," vol. 9, Metal Powders Industries Federation, 1977, pp. 525-536.

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