Method for reducing abnormal grain growth in Ni-base superalloys

Details Method for reducing abnormal grain growth in Ni-base superalloys Method for reducing abnormal grain growth in Ni-base superalloys

1995-04-26

1996-09-17

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148206, C23C 820

Patent

active

055564844

ABSTRACT:
A method of forging Ni-base superalloys is described which avoids the growth of abnormally large grains in the surface region of a forged article. The method involves forging and/or annealing a Ni-base superalloy in a carburizing environment. Forging and/or annealing in a carburizing environment is done to maintain the carbon concentration in the surface region at a level that is sufficient to prevent the depletion of carbides and carbonitrides. The carburizing environment may also be selected so that it is non-oxidizing with respect to aluminum, in order to prevent the depletion of aluminum and the reduction of the .gamma.' phase in the surface region.

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