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论文类型：期刊论文

发表时间：2018-01-01

发表刊物：MATERIALS SCIENCE AND TECHNOLOGY

收录刊物：SCIE、EI

卷号：34

期号：5

页面范围：607-611

ISSN号：0267-0836

关键字：Creep; deformation; Ni-based superalloy; advance ultra-supercritical; microstructure

摘要：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'.