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Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures
Cui, Luqing; Yu, Jinjiang; Liu, Jinlai; Sun, Xiaofeng
2019-01-30
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume773Pages:250-263
AbstractTotal 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.
KeywordM951G alloy Low cycle fatigue Cyclic stress response Deformation mechanisms Microstructural degradations
Indexed BySCI
Language英语
WOS IDWOS:000449741200030
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/81432
Collection中国科学院金属研究所
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,&Sun, 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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