Fracture toughness and fracture behavior of GH690 alloy at different temperatures

Fuqiang Wang, Lei Wang, Yang Liu, Hui Feng, Peng Wang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The fracture toughness and fracture behavior of GH690 alloy were investigated by means of three-point bending tests and the J-integral method in the range of the room temperature to 623 K. The results show that the fracture toughness of the alloy decreases with the increasing of testing temperature. The stacking fault energy of GH690 alloy is low at room temperature and the alloy was deformed by twinning. Deformation twins perpendicular to the main crack could lead to the defluxion of the crack, which is beneficial to the enhancement of the fracture toughness. However, with the testing temperature elevated, the stacking fault energy increases and the number of the deformation twins decreases, allowing an easier propagation of the crack and is responsible for the decrease of the fracture toughness of GH690 alloy.

Original languageEnglish
Pages (from-to)299-304
Number of pages6
JournalCailiao Yanjiu Xuebao/Chinese Journal of Materials Research
Issue number3
StatePublished - Jun 2010
Externally publishedYes


  • Deformation twin
  • Fracture toughness
  • GH690 alloy
  • Metallic materials
  • Stacking fault energy


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