Skin melting

Details Skin melting Skin melting

C - Chemistry, Metallurgy

22

F

148/12

C22F 1/02 (2006.01) C21D 1/09 (2006.01) C23C 26/02 (2006.01)

Patent

CA 1095387

SKIN MELTING ABSTRACT OF THE DISCLOSURE A surface treatment for a class of metallic articles is described. The treatment involves the melting of a thin surface layer of the article by a concentrated energy source, within a narrow set of parameters The melting step is performed in a manner which maximizes the temperature gradient between the melted and unmelted portion of the article, consequently, cooling and solidification upon the removal of the energy source is extremely rapid occurring at rates in excess of 103°F/sec. The preferred energy source is a continuous wave laser and in the preferred embodiment, a flowing inert gas cover is used to minimize melt contamination and plasma forma- tion. The technique may be used to produce amorphous surface layers in a specific class of eutectic alloys. In another class of alloys, based on the transition metals and containing precipitates rich in one or more metalloids, uniquely fine microstructures may be produced. -1-

271148

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