Influence of Plastic Deformation during ECAP on Precipitation Temperature of γ″ in IN 718 Alloy

Abstract:

The formation behavior of γ″(Ni3Nb) precipitates in IN 718 alloy before and after ECAP(equal channel angular pressing) was investigated by microstructural observation and the hardness test. For the alloy examined before ECAP, the γ″ precipitates were formed only after aging treatment at 720
, whereas after ECAP, the γ″ precipitates were formed at the aging temperatures of both 600
and 720
. 600
is normally too low a temperature for γ″ precipitates to be formed in commercial IN 718 alloy, however, they were able to be formed due to severe plastic deformation by ECAP. It was found that the ECAP process changed the formation behavior of the γ″ precipitates in IN 718 alloy.

• Periodical: Solid State Phenomena (Volume 118)
• Pages: 431-436
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.118.431
• Online since: December 2006
• Authors: Il Ho Kim, S.I. Kwun
• Keywords: Aging Treatment, Equal-Channel Angular Pressing (ECAP), IN 718 Alloy, γ'' Precipitate

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