Method for improving metallurgical bond in bimetallic castings

Details Method for improving metallurgical bond in bimetallic castings Method for improving metallurgical bond in bimetallic castings

B - Operations, Transporting

23

K

167/11, 13/22

B23K 20/00 (2006.01)

Patent

CA 1046713

ABSTRACT Method for making a bicast article in which a solid metal preform is positioned in a mold and a molten metal is cast around portions of the preform which are exposed in the mold. In accordance with the present invention, the exposed portion are coated prior to the casting step with a boron containing alloy which is compatible with the preform and with the metal to be cast about it, the boron containing alloy hav- ing a melting range below the melting range of either the pre- form or the cast metal. The alloy also has a major ingredient which is the same as the major ingredient of at least one of the metals to be joined. After solidification of the molten metal in the casting cavity, the resulting bicast article is heat treated at a temperature below the melting range of either the preform or the solidified metal to cause diffusion of boron into the preform and into the solidified metal thereby provid- ing an improved metallurgical bond.

266052

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