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| Fracture Toughness and Fracture Behavior of GH690 Alloy at Different Temperatures |
| WANG Fuqiang, WANG Lei, LIU Yang, FENG Hui, WANG Peng |
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Cite this article:
WANG Fuqiang WANG Lei LIU Yang FENG Hui WANG Peng. Fracture Toughness and Fracture Behavior of GH690 Alloy at Different Temperatures. Chin J Mater Res, 2010, 24(3): 299-304.
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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 deflexion 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.
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Received: 10 December 2009
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| Fund: Supported by National Key Basic Research and Development Program of China No.2006CB605005, and the Program for Changjiang Scholars and Innovative Research Team in University No.IRT0713. |
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