Materials Reports  2020, Vol. 34 Issue (Z1): 375-379 |
| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Mixed Grain Structure on High Temperature Stress Rupture Propertyof Ni-based GH4720Li Superalloy |
| XIE Xingfei1,2, QU Jinglong1,2, DU Jinhui1,2
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1 Beijing GAONA Materials & Technology Co., LTD, Beijing 100081, China;
2 High Temperature Materials Research Institute, Central Iron and Steel Research Institute, Beijing 100081, China |
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Abstract GH4720Li nickel-based superalloy has excellent high temperature mechanical properties, and has been widely used in hot end components of aero-engine. In the actual production process, it is easy to obtain the mixed crystal structure with local coarse grains in GH4720Li superalloy. In this paper, effect of mixed grains structure in GH4720Li superalloy on rupture property at 680 ℃/830 MPa and 730 ℃/530 MPa was studied through high temperature stress rupture tests and scanning electron microscope. The results indicate that rupture failure mechanism is dominated by the dislocation movement within grains at 680 ℃/830 MPa, and the rupture life decreases with increase of the number of coarse grains. The grain boundary slip mechanism also plays a role when the content of coarse grains in the mixed grains is the similar, and increasing the size of coarse grains can effectively prolong rupture life. Moreover, the rupture failure mechanism at 730 ℃/530 MPa is dominated by grain boundary slip mechanism, and the rupture life is prolonged as increase of the number of coarse grains. For the similar content of coarse grain in mixed grain structure, the rupture life decreases with increase of coarse grain size.
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Published: 01 July 2020
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| About author:: Xingfei Xie was graduated from Shanghai Jiao Tong University in 2017. He is now a senior engineer in Central Iron and Steel Research Institute, and is mainly investigating in microstructures and properties of superalloys. |
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