| Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa | |
| Li Yifei; Wang Li; Zhang Gong; Qi Dongqing; Du Kui; Lou Langhong | |
| 2020 | |
| Source Publication | Acta Metallurgica Sinica(English Letters)
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| ISSN | 1006-7191 |
| Volume | 33Issue:3Pages:446-458 |
| Abstract | The influence of orientation on the stress rupture behaviors of a 3rd-generation nickel-based single-crystal superalloy was investigated at 1100 °C/150 MPa.It is found that the stress rupture anisotropy is shown at 1100 °C, but not so obvious compared with that at intermediate temperatures.The 001 specimens display the longest rupture life, 111 specimens show the shortest rupture life, and 011 specimens exhibit the intermediate life.Detailed observations show that the final fracture is caused by crack initiation and propagation, and the anisotropy of three oriented specimens is related to the fracture modes, γ / γ ? microstructures, interfacial dislocation networks and cutting mechanisms in γ ? phase.For 001 specimens,N -type rafted structures are formed which can well hinder the slip and climb of dislocations.Besides, the regular interfacial dislocation networks can prevent dislocations from cutting into γ ? phase, leading to the improvement of the creep resistance.For 011 specimens, ± 45° rafted structures and irregular networks result in less strain hardening.For 111 specimens, a large number of crack propagation paths and inhomogeneous deformations caused by irregular rafted structures deteriorate the property and result in the shortest life.Furthermore, a 100 superdislocations with low mobility are widely formed in 001 and 011 specimens which suggests the low creep strain rate during steady creep stage, whereas superdislocations in 111 specimens possess high mobility, which indicates the high strain rate and corresponding poor stress rupture property. |
| Keyword | Single-crystal superalloy Stress rupture Anisotropy Microstructure Dislocation |
| Indexed By | CSCD |
| Language | 英语 |
| CSCD ID | CSCD:6667168 |
| Citation statistics |
Cited Times:3[CSCD]
[CSCD Record]
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| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/152131 |
| Collection | 中国科学院金属研究所 |
| Affiliation | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | Li Yifei,Wang Li,Zhang Gong,et al. Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa[J]. Acta Metallurgica Sinica(English Letters),2020,33(3):446-458. |
| APA | Li Yifei,Wang Li,Zhang Gong,Qi Dongqing,Du Kui,&Lou Langhong.(2020).Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa.Acta Metallurgica Sinica(English Letters),33(3),446-458. |
| MLA | Li Yifei,et al."Anisotropic Stress Rupture Properties of a 3rd-Generation Nickel-Based Single-Crystal Superalloy at 1100 °C/150 MPa".Acta Metallurgica Sinica(English Letters) 33.3(2020):446-458. |
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