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High cycle fatigue behavior of a single crystal superalloy at elevated temperatures
Liu, Y.; Yu, J. J.; Xu, Y.; Sun, X. F.; Guan, H. R.; Hu, Z. Q.
Corresponding AuthorLiu, Y.(yuanliu@imr.ac.cn)
2007-04-25
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume454Pages:357-366
AbstractSmooth and notched specimens of single crystal (SC) superalloy SRR99 with [001] orientation were subjected to high-cycle fatigue (HCF) loading at temperatures of 700 degrees C, 760 degrees C, 850 degrees C and 900 degrees C in ambient atmosphere. The results demonstrate that the fatigue strength of smooth specimens reached the maximum at 760 degrees C and decreased with increasing temperature. The alloy became more notching sensitive with increase of temperature while the notch sensitivity declined at 900 degrees C. Analysis on fracture surfaces of both smooth and notched specimen shows that a transition from ductile fracture at lower temperatures to cleavage mode at higher temperatures were observed. Evolution of the microstructure was investigated by SEM and TEM observation. With the process of cyclic plastic deformation at elevated temperatures, the primary cuboidal gamma' precipitates tended to dissolve into the matrix channels, meanwhile a larger number of secondary gamma' particles were formed in the gamma matrix. In addition, different types of dislocation structures were developed during the cyclic deformation, which would have a significant impact on the fatigue life of the material. (C) 2006 Elsevier B.V. All rights reserved.
Keywordsingle crystal high-cycle fatigue notch sensitivity dislocation networks slip bands
DOI10.1016/j.msea.2006.11.045
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000245898500049
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:44[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/91112
Collection中国科学院金属研究所
Corresponding AuthorLiu, Y.
Affiliation1.Chinese Acad Sci, Met Res Inst, Shenyang 110016, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Liu, Y.,Yu, J. J.,Xu, Y.,et al. High cycle fatigue behavior of a single crystal superalloy at elevated temperatures[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2007,454:357-366.
APA Liu, Y.,Yu, J. J.,Xu, Y.,Sun, X. F.,Guan, H. R.,&Hu, Z. Q..(2007).High cycle fatigue behavior of a single crystal superalloy at elevated temperatures.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,454,357-366.
MLA Liu, Y.,et al."High cycle fatigue behavior of a single crystal superalloy at elevated temperatures".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 454(2007):357-366.
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