Abstract
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 language | English |
|---|---|
| Pages (from-to) | 299-304 |
| Number of pages | 6 |
| Journal | Cailiao Yanjiu Xuebao/Chinese Journal of Materials Research |
| Volume | 24 |
| Issue number | 3 |
| State | Published - Jun 2010 |
| Externally published | Yes |
Keywords
- Deformation twin
- Fracture toughness
- GH690 alloy
- Metallic materials
- Stacking fault energy