Tensile deformation-induced dislocation configurations at intermediate temperatures in a Ni-Fe-based superalloy for advanced ultra-supercritical coal-fired power plants

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

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

A low cost Ni-Fe-based superalloy due to its good mechanical properties and good workability has been evaluated as a promising candidate boiler material for advanced ultra-supercritical coal-fired power plants with temperature up to 700 °C. The major concerns with Ni-Fe-based alloys are the fundamental deformation mechanisms at intermediate temperatures. In this paper, great emphasis is placed on the dislocation configurations induced by tensile deformation in this low cost Ni-Fe-based superalloy. Two typical deformation-induced microstructure features, Orowan looping and precipitates shearing, are present during tensile deformation. Careful identification of dislocation-based deformation mechanisms by transmission electron microscopy was performed in tensile strained specimens at 20 °C, 500 °C, 650 °C, 700 °C and 750 °C in order to correlate the macroscopic behavior with the tension controlling mechanisms.

Original languageEnglish
Pages (from-to)565-569
Number of pages5
JournalJournal of Alloys and Compounds
Volume657
DOIs
Publication statusPublished - 2016 Feb 5
Externally publishedYes

Keywords

  • Deformation
  • Dislocation
  • Ni-Fe alloy
  • Tensile test
  • Transmission electron microscopy (TEM)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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