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CREEP CHARACTERISTICS OF A Ni BASE SINGLE CRYSTAL SUPERALLOY WITH [011] ORIENTATION
Shui Li1,2; Jin Tao1; Hu Zhuangqi1
Corresponding AuthorShui Li(dcbsy@yahoo.com.cn)
2009-11-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume45Issue:11Pages:1349-1355
AbstractThe creep behavior of a Ni base single crystal superalloy with [011] orientation under three conditions of temperature and stress level has been investigated. Creep deformation of the tested alloy occurs largely through dislocation activity in the gamma matrix channel. Shearing of the gamma' precipitates is observed, while at higher temperature, this does not occur until late in life by means of the passage of superpartial dislocation. At lower temperature (750 degrees C) and high stress level, shearing of the gamma' precipitates is observed in the relatively early creep through the passage of 1/3 < 112 > dislocation, which leaves superlattice stacking faults (SSFs) in the precipitates. The creep behavior is closely related to microstructure evolution, the creep curve at 750 degrees C exhibits higher primary and steady creep rates, and thereby the creep life is shorter. Under the condition of 870 degrees C and 500 MPa, the steady-stage creep does not appear, it is suggested that the creel) life is greatly influenced by the inhomogeneous slip band. At higher temperature and lower stress, such as 980 degrees C and 200 MPa, the alloy has longer creep life and lower steady creep rate. Observation of the dislocation configuration shows that the hexagonal dislocation network appears on the gamma/gamma' interface at the early creep stage, the regular and denser dislocation networks can inhibit dislocation cutting into gamma' phase and enhance the resistance of dislocation movement. In the later stage, gamma' precipitates are sheared by dislocation, which leads to an acceleration of creep rate.
Keyword[011] orientated Ni base single crystal tensile creep dislocation
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000272502600012
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/99142
Collection中国科学院金属研究所
Corresponding AuthorShui Li
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang 110168, Peoples R China
Recommended Citation
GB/T 7714
Shui Li,Jin Tao,Hu Zhuangqi. CREEP CHARACTERISTICS OF A Ni BASE SINGLE CRYSTAL SUPERALLOY WITH [011] ORIENTATION[J]. ACTA METALLURGICA SINICA,2009,45(11):1349-1355.
APA Shui Li,Jin Tao,&Hu Zhuangqi.(2009).CREEP CHARACTERISTICS OF A Ni BASE SINGLE CRYSTAL SUPERALLOY WITH [011] ORIENTATION.ACTA METALLURGICA SINICA,45(11),1349-1355.
MLA Shui Li,et al."CREEP CHARACTERISTICS OF A Ni BASE SINGLE CRYSTAL SUPERALLOY WITH [011] ORIENTATION".ACTA METALLURGICA SINICA 45.11(2009):1349-1355.
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