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HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C
Xie Jun; Yu Jinjiang; Sun Xiaofeng; Jin Tao
Corresponding AuthorYu Jinjiang(jjyu@imr.ac.cn)
2016-03-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume52Issue:3Pages:257-263
AbstractNi-based speralloys have been widely used to make the blade parts of the advanced aeroengines for their high temperature tolerance and good mechanical property. During high temperature service, the materials endure the effects of temperature and alternating load, causing high-cycle fatigue deformation on the hot-end components. Meanwhile, the fatigue behaviors of the alloy are closely related to the deformation mechanisms and its microstructure characteristics, such as the size, distribution and morphology of gamma' phase and carbides, and the fatigue fracture of the using materials possesses unpredictability. Therefore, investigating fatigue behaviors of the material is of significance in alloy design and life prediction. But the high-cycle fatigue behavior of K416B superalloy with high W content is still unclear up to now. For this reason, by means of high-cycle fatigue property measurement and microstructure observation, the high-cycle fatigue behavior of K416B Ni-based superalloy at 700 degrees C has been investigated. The results show that at 700 degrees C and stress ratio R=-1, the high-cycle fatigue life of K416B super alloy decreases with the stress increasing, and high-cycle fatigue strength of the alloy is 175 MPa. At the condition of low stress amplitude, the deformed dislocations may slip along different orientations in the matrix. With the stress amplitude increasing, the dislocations may shear into gamma' phase and form the stacking fault. During tension and compression high-cycle fatigue, multiple slip systems are activated in the alloy, and the distortion occurs along various directions, resulting in stress concentration on the regions of gamma+gamma' eutectic and carbides. The crack sources may be initiated at the eutectic and blocky carbide near the surface of the alloy. As high-cycle fatigue goes on, the cracks propagate along the inter-dendrite in expansion 'region, and the typical cleavage fracture occurs in the final rupture region.
KeywordK416B Ni-based superalloy high-cycle fatigue deformation mechanism fracture feature
Indexed BySCI
Language英语
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000372691500001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/121837
Collection中国科学院金属研究所
Corresponding AuthorYu Jinjiang
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Xie Jun,Yu Jinjiang,Sun Xiaofeng,et al. HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C[J]. ACTA METALLURGICA SINICA,2016,52(3):257-263.
APA Xie Jun,Yu Jinjiang,Sun Xiaofeng,&Jin Tao.(2016).HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C.ACTA METALLURGICA SINICA,52(3),257-263.
MLA Xie Jun,et al."HIGH-CYCLE FATIGUE BEHAVIOR OF K416B Ni-BASED CASTING SUPERALLOY AT 700 degrees C".ACTA METALLURGICA SINICA 52.3(2016):257-263.
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