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Title: Investigation on the Microstructure Changes of NiCrAIY Coating Due to Shot Peening Plastic Deformation and Aging
Author: Wang Renzhi, Ru Jilai
Source: Conf Proc: ICSP-7 (pg 33-41)
Publication year 1999
Document number: 1999013
Number of pages: 9
Abstract:
NiCrAIY coating achieved by means of arc plasma deposition (APD) was used to protect DD3, a kind of nickel base single crystal superalloy, from elevated temperature
oxidation. Phase analysis, microstructure and density of the coating in different states including diffused, plastic deformed and aged after peening plastic deformation
have been investigated. It has been showed that the shot peening plastic deformation can not only transform order Ni3Al phase, matrix of coating, into disorder one as well
as dissolve NiAI phase precipitated during diffusion treatment but also increase the density by 30%. It has also been pointed out the NiAl phase can be precipitated again
from plastic deformed matrix Ni3AI at 1100°C. The coating can be strengthened by the NiAl phase precipitation during aging treatment. Both increase of density and
precipitation of NiAl phase during aging treatment result in the improvement of resistance to the elevated temperature oxidation for NiCrAlY coating.
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