Rupture mechanism of GH2984 crept at temperature between 700-750 ℃

Jing Bo Yan, Yue Feng Gu, Yi Min Gao, Fei Sun, Xin Bao Zhao, Ying Ying Dang, Zhen Yang, Hong Fei Yin

Research output: Contribution to journalArticlepeer-review

Abstract

The microstructure evolution and its effect on the properties of GH2984 alloy between 700 and 750 ℃ were investigated. The results show the rupture life is only about 160 h when the alloy was crept at 700 ℃ and 300 MPa. The stress concentration and consequently crack nucleation and propagation are the main reason for failure of the alloy. When the stress decreases, the stress concentration is released by the grain rotation. It inhibits the crack nucleation and thus extends the alloy rupture life obviously. However, accompanied with the grain deformation proceeding, the dynamic recrystallization occurs when the creep temperature increases. This leads to the increases of the alloy creep ductility, but decreases the alloy rupture life because of the lower work hardening extent.

Original languageEnglish
Pages (from-to)551-559
Number of pages9
JournalZhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals
Volume26
Issue number3
Publication statusPublished - 2016 Mar 1
Externally publishedYes

Keywords

  • Creep
  • Dynamic recrystallization
  • Fe-Ni-base superalloy
  • Stress concentration

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Materials Chemistry

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