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Creep behavior and a deformation mechanism based creep rate model under high temperature and low stress condition for single crystal superalloy DD5
Xu, Ke1,2; Wang, Guanglei2; Liu, Jide2; Li, Jinguo2; Liu, Jinlai2; Wang, Xinguang2; Yang, Yanhong2; Ye, Lihua2; Zhou, Yizhou2; Sun, Xiaofeng2
Corresponding AuthorLiu, Jide(jdliu@imr.ac.cn)
2020-06-01
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume786Pages:10
AbstractThis work reports the investigation on creep behavior under high temperature and low stress condition for single crystal superalloy DD5 and the subsequent establishment of a deformation mechanism based creep rate model. The gamma/gamma' microstructure evolution and the precipitate-dislocation interaction mode were investigated systematically during creep test at 1100 degrees C and 120 MPa, for a better understanding of underlying creep deformation characteristics. The gamma/gamma' microstructure becomes rafted and topological inverted eventually as creep deformation continues. The formation of dense interfacial dislocation network that impedes dislocations from cutting into gamma' precipitates is assumed to be one of the main strengthening mechanisms during creep. The climbing over rafted gamma' precipitates is seen as a recovery/softening process which annihilates dislocations, receding the strengthening effect of interfacial dislocation network. The cutting through rafted gamma' precipitates is proposed to account for the acceleration of creep, a strong dependence of creep properties on rafting (the effect of widening horizontal. channel on the degraded back stress of cutting through rafted gamma' precipitates) then arises. The established model involving these characteristics was found to predict the creep behavior (below 1% creep strain) under different temperatures and stresses for single crystal superalloy DD5 accurately. Several microstructure characteristics and physical properties emerge from the model, which is promising for alloy design and compositional optimization.
KeywordNickel based single crystal superalloys Creep behavior Microstructure Creep model
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; National Science and Technology Major Project
DOI10.1016/j.msea.2020.139414
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51871221] ; National Key Research and Development Program of China[2017YFA0700704] ; National Science and Technology Major Project[2017-VI-0002-0072]
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000541737900018
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139469
Collection中国科学院金属研究所
Corresponding AuthorLiu, Jide
Affiliation1.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Xu, Ke,Wang, Guanglei,Liu, Jide,et al. Creep behavior and a deformation mechanism based creep rate model under high temperature and low stress condition for single crystal superalloy DD5[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,786:10.
APA Xu, Ke.,Wang, Guanglei.,Liu, Jide.,Li, Jinguo.,Liu, Jinlai.,...&Sun, Xiaofeng.(2020).Creep behavior and a deformation mechanism based creep rate model under high temperature and low stress condition for single crystal superalloy DD5.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,786,10.
MLA Xu, Ke,et al."Creep behavior and a deformation mechanism based creep rate model under high temperature and low stress condition for single crystal superalloy DD5".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 786(2020):10.
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