Fabrication of cast articles from high melting temperature...

Details Fabrication of cast articles from high melting temperature... Fabrication of cast articles from high melting temperature...

B - Operations, Transporting

22

F

B22F 3/24 (2006.01) B23K 20/02 (2006.01) B23P 6/04 (2006.01) C21D 10/00 (2006.01)

Patent

CA 2056527

A superalloy article is fabricated by casting a high melting temperature superalloy composition and then refurbishing the primary defects that are found in the surface of the cast piece. The article is refurbished by excising the primary defects and a surrounding portion of metal by grinding. filling the excised volume with metal of the same composition as the cast article by welding or a similar technique. smoothing the surface around any resulting filler metal defects, and applying a cladding powder to the surface from which the filler metal defects are removed. The cladding powder is applied by painting a binder onto the surface and then dusting cladding powder onto the binder before it has dried. The cladding powder is a mixture of particles of a high melting temperature superalloy and particles of a lower melting temperature metal. The article is heated to a preselected temperature, depending on the alloy, to melt and subsequently solidify the cladding powder. Finally, the article is hot isostatically pressed to achieve final closure of surface defects.

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