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US 8,136,571 B2Granted
Carbidic outer edge ductile iron product, and as cast surface alloying process
OwnerMark DeBruininventor
Life of this patent
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Abstract
A process is used for applying carbiding agents to the surface of ferrous metal castings, using the “lost foam” method. Carbiding agents are applied to the foam form at selected places so that the final product has the desired amount of carbidic content at the right locations to endure high stress applications on the casting.
Claims11
A lost form method of forming, an as cast, ductile iron casting with a carbide surface layer on at least one preselected surface area of said ductile iron casting, said method comprising the steps of:
- a) providing a vaporizable form in the shape of said ductile iron casting;
- b) applying a carbidic formation agent to at least one preselected surface area of said form, corresponding to said at least one preselected surface area of said ductile iron casting to be formed;
- c) placing said form in a container and surrounding said form with sand;
- and,
- d) applying molten ductile iron to said container, vaporizing said form to create said ductile iron casting having a carbide layer on said at least one preselected surface area.
2 more elements
Dependencies are inferred from the claim text.