Dislocation motion in a NI-Fe-based superalloy during creep-rupture beyond 700°C

Fei Sun, Y. F. Gu, J. B. Yan, Z. H. Zhong, M. Yuyama

研究成果: Article査読

14 被引用数 (Scopus)


A Ni-Fe based superalloys with excellent high temperature mechanical properties and low cost have been evaluated as the promising candidate materials for advanced ultra-supercritical coal-fired power plants. The major concerns with the Ni-Fe-based alloys are the insufficient fundamental deformation mechanisms at intermediate temperatures. In this study, dislocation-based deformation mechanisms were identified carefully in creep ruptured specimens beyond 700°C. The motion of dislocations allows plastic deformation to occur. Two types of dislocation configurations mainly occurred during the creep rupture tests beyond 700°C. Below 750°C, Orowan looping are more likely occur and considered as the predominant deformation mechanism. Above 750°C, the predominant model of deformation mechanism becomes γ′ precipitates shearing. Detailed identification of dislocation configurations were performed in the creep rupture specimens in order to correlate the macroscopic behavior with the creep controlling mechanisms.

ジャーナルMaterials Letters
出版ステータスPublished - 2015 11 15

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学


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