Substrate stabilization of diffusion aluminide coated nickel-bas

Details Substrate stabilization of diffusion aluminide coated nickel-bas Substrate stabilization of diffusion aluminide coated nickel-bas

1991-12-05

1994-08-02

Dean, R.

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148220, 148316, 148901, 148902, 416241R, 428610, C23C 834

Patent

active

053342631

ABSTRACT:
A superalloy article has a nickel-based superalloy substrate containing TCP-phase forming elements such as rhenium, chromium, tantalum and tungsten. A carbide precipitate-containing region is formed within the substrate extending to a carbide depth below a surface of the substrate, preferably by depositing carbon on the surface of the substrate and diffusing the carbon into the substrate. An aluminum-rich diffusion layer extends from the surface of the substrate to an aluminide depth below the surface of the substrate. Preferably, the carbide depth is about the same as the aluminide depth. The presence of the carbide precipitates inhibits the formation of the deleterious TCP-phase.

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