| Thermal Fatigue Behavior of Ni_3Al Based Superalloy IC6E |
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| 作者姓名： | JI Lei* LI Shu-suo HAN Ya-fang JIANG Li-wu School of Materials Science and Engineering Beijing University of Aeronautics and Astronautics Beijing China |
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| 作者单位： | JI Lei*，LI Shu-suo，HAN Ya-fang，JIANG Li-wu School of Materials Science and Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China |
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| 摘 要： | The thermal fatigue behavior of Ni3Al based superalloy IC6E during the cycles between 900 ℃/1 000 ℃ and the room tempera-ture was investigated. The experimental results indicate that the primary and secondary thermal fatigue cracks initiate inside or round the borides and then spread away along grain boundaries and/or in interdendritic areas. The fracture of borides and their separation from the matrix at interfaces are mainly responsible for the crack initiation and its spreading. At temperatures higher than 1 000 ℃, the grain boundary oxidation combined with cyclic stresses accelerates the crack growth.
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Thermal Fatigue Behavior of Ni3Al Based Superalloy IC6E |
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| JI Lei*,LI Shu-suo,HAN Ya-fang,JIANG Li-wu School of Materials Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing ,China.Thermal Fatigue Behavior of Ni_3Al Based Superalloy IC6E[J].Chinese Journal of Aeronautics,2006,19(Z1). |
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| Authors: | JI Lei LI Shu-suo HAN Ya-fang JIANG Li-wu |
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| Abstract: | The thermal fatigue behavior of Ni3Al based superalloy IC6E during the cycles between 900 ℃/1 000 ℃ and the room temperature was investigated. The experimental results indicate that the primary and secondary thermal fatigue cracks initiate inside or round the borides and then spread away along grain boundaries and/or in interdendritic areas. The fracture of borides and their separation from the matrix at interfaces are mainly responsible for the crack initiation and its spreading. At temperatures higher than 1 000 ℃, the grain boundary oxidation combined with cyclic stresses accelerates the crack growth. |
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| Keywords: | Ni3Al thermal fatigue cast superalloy |
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