| Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy | |
| Ou, Meiqiong1; Ma, Yingche1; Ge, Hualong2,3; Chen, Bo1; Zheng, Shijian2; Liu, Kui1 | |
| Corresponding Author | Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn) |
| 2018-10-24 | |
| Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
 |
| ISSN | 0921-5093 |
| Volume | 736Pages:76-86 |
| Abstract | The microstructure, stress rupture properties and deformation mechanisms of a new alloy during long-term aging were investigated. The microstructure evolution mainly included the coarsening of gamma' phase and the precipitation of eta phase. During aging at 700 degrees C, 750 degrees C and 800 degrees C, the coarsening rate k of gamma' phase was about 7.818 nm(3)/h, 42.927 nm(3)/h and 178.226 nm(3)/h, respectively. The activation energy Q for gamma' coarsening was about 279.98 kJ/mol, which meant that element diffusion controlled the coarsening of gamma' phase. After aging at 750 degrees C for 3000 h and 800 degrees C for 2000 h, a new needle-like eta phase was precipitated near GBs and around MC carbides, then grew into the grain interiors. The quantity of eta phase increased with the increase of aging time. With the growth of eta phase, gamma' depleted zones were found around eta phase. This was principally because both gamma' phase and eta phase were enriched in Ni and Ti, and the growing up of I phase absorbed gamma' phase. After aging at 700 degrees C for 300-3000 h and 750 degrees C for 300-2000 h, the stress rupture life at 750 degrees C/430 MPa remained at a high level and most of them were higher than 100 h. That was because the slightly grown-up gamma' phase acted as strong obstacles to the dislocation motion, Orowan bypassing combing stacking fault shearing acted as the dominant mechanism during stress rupture deformation. After aging at 750 degrees C and 800 degrees C for 3000 h, the stress rupture life decreased to 45.7 h and 7.68 h, respectively. One reason was that the seriously grown-up gamma' phase was very hard to impede the dislocation motion, almost all gamma' phases were cut by dislocations with leaving stacking faults inside them during stress rupture deformation. The other reason was that needle-like eta phase promoted dislocation pile-up and contributed to the nucleation of micro-cracks, meanwhile the gamma' depleted zones could be conductive to the propagation of micro-cracks. |
| Keyword | Nickel based superalloy Long-term aging gamma ' phase eta phase Dislocation Stress rupture properties |
| DOI | 10.1016/j.msea.2018.08.096 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000447573400008 |
| Publisher | ELSEVIER SCIENCE SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/129842 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Ma, Yingche; Liu, Kui |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China |
| Recommended Citation GB/T 7714 | Ou, Meiqiong,Ma, Yingche,Ge, Hualong,et al. Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2018,736:76-86. |
| APA | Ou, Meiqiong,Ma, Yingche,Ge, Hualong,Chen, Bo,Zheng, Shijian,&Liu, Kui.(2018).Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,736,76-86. |
| MLA | Ou, Meiqiong,et al."Effect of long-term aging on the microstructure, stress rupture properties and deformation mechanisms of a new cast nickel base superalloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 736(2018):76-86. |
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