Title of Paper:Misorientation dependence of grain boundary migration in advanced ultra-supercritical Ni-based superalloy

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Date of Publication:2018-01-01

Journal:MATERIALS SCIENCE AND TECHNOLOGY

Included Journals:SCIE、EI

Volume:34

Issue:5

Page Number:607-611

ISSN No.:0267-0836

Key Words:Creep; deformation; Ni-based superalloy; advance ultra-supercritical; microstructure

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 gamma' phase with rodlike shape was formed and the precipitate-free zones emerged around this coarsened gamma'. The distributional misorientation angle of these grain boundaries was from 45 degrees to 65 degrees. 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 gamma'.