http://orcid.org/0000-0001-8655-5864
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ABSTRACT
The microstructures of a Ni-based superalloy used in the advanced ultra-supercritical condition were investigated after creep deformation. The grain boundary migrated during tertiary creep. Accompanied by the migration of grain boundaries, the coarsened γ′ phase with rodlike shape was formed and the precipitate-free zones emerged around this coarsened γ′. The distributional misorientation angle of these grain boundaries was from 45° to 65°. After the examination of the distribution characteristics of the cracks, it was found that the intergranular cracks did not propagate through the precipitate-free zones with the coarsened γ′.
Disclosure statement
No potential conflict of interest was reported by the authors.
ORCID
Tieshan Cao http://orcid.org/0000-0001-8655-5864
Additional information
Funding
This research was supported by the National Natural Science Foundation of China [grant number U1610256], [grant number 51771042]; Coal-based key scientific and technological project of Shanxi province (MC2014-03) and Basic research program of Shanxi province (201601D102022).