Method for making a coated Ni base superalloy article of improve

Details Method for making a coated Ni base superalloy article of improve Method for making a coated Ni base superalloy article of improve

1995-09-14

1997-12-09

Utech, Benjamin

Coating processes

With pretreatment of the base

Metal base

427328, 427355, 4273831, B05D 300

Patent

active

056958218

ABSTRACT:
A coated Ni base superalloy article is provided with improved microstructural stability under a coating at least partially diffused into an article surface portion, by avoiding the formation, after exposure to elevated temperatures, of a constituent called SRZ which can affect detrimentally mechanical properties of the article. Such avoidance can result from neutralizing stress in the article surface portion prior to coating, for example by physically removing the stressed portion or by recrystallizing the stressed portion to a fine grained structure which subsequently can be consumed by diffusing elements in a coating method. Also, such avoidance can result from maintaining a Re segregation factor, Re.DELTA., between dendrite cores and interdendritic regions of the alloy cast structure at no greater than about 40%.

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