| Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures | |
| Cui, Luqing1,2; Yu, Jinjiang1; Liu, Jinlai1; Su, Xiaofeng1 | |
| Corresponding Author | Yu, Jinjiang(jjyu@imr.ac.cn) |
| 2019-01-30 | |
| Source Publication | JOURNAL OF ALLOYS AND COMPOUNDS
 |
| ISSN | 0925-8388 |
| Volume | 773Pages:250-263 |
| Abstract | Total strain-controlled low cycle fatigue tests were conducted on the newly designed nickel-base superalloy M951G under different testing conditions; the relationship among cyclic stress responses, microstructural degradations, deformation mechanisms and testing conditions has been established. Results show that both the cyclic hardening and softening behaviors are dependent on the testing temperature and strain amplitude. As the strain amplitude increases both at 900 and 1000 degrees C, M951G alloy exhibits cyclic hardening under low strain amplitudes and cyclic softening under higher strain amplitudes. At 900 degrees C, the initial cyclic hardening is related to the coherent gamma/gamma' interface, parallel dislocation arrays and dislocation bypassing the tiny gamma' particles. At higher strain amplitudes, the initial cyclic softening is due to the higher density of shearing dislocations in gamma' precipitates. At 1000 degrees C, plenty of parallel dislocation arrays present in gamma channels, which reduces the possibility of dislocation interactions from different slip systems and results in initial cyclic hardening. Under higher strain amplitudes, apart from microstructural degradations, dislocations shearing into gamma' precipitates and formation of dislocation networks, the dislocation annihilation and partial loss of coherency of gamma' precipitates are also responsible for the initial cyclic softening at 1000 degrees C. (C) 2018 Published by Elsevier B.V. |
| Keyword | M951G alloy Low cycle fatigue Cyclic stress response Deformation mechanisms Microstructural degradations |
| Funding Organization | National Natural Science Foundation of China (NSFC) |
| DOI | 10.1016/j.jallcom.2018.09.267 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China (NSFC)[51571196] ; National Natural Science Foundation of China (NSFC)[51771191] ; National Natural Science Foundation of China (NSFC)[51701212] |
| WOS Research Area | Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering |
| WOS Subject | Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| WOS ID | WOS:000449741200030 |
| Publisher | ELSEVIER SCIENCE SA |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/130414 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Yu, Jinjiang |
| Affiliation | 1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China |
| Recommended Citation GB/T 7714 | Cui, Luqing,Yu, Jinjiang,Liu, Jinlai,et al. Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,773:250-263. |
| APA | Cui, Luqing,Yu, Jinjiang,Liu, Jinlai,&Su, Xiaofeng.(2019).Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures.JOURNAL OF ALLOYS AND COMPOUNDS,773,250-263. |
| MLA | Cui, Luqing,et al."Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures".JOURNAL OF ALLOYS AND COMPOUNDS 773(2019):250-263. |
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