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Investigation on freckle formation and evolution of single-crystal nickel-based superalloy specimens with different thicknesses and abrupt cross-section changes
Han, Dongyu; Jiang, Weiguo; Xiao, Jiuhan; Li, Kaiwen; Lu, Yuzhang; Zheng, Wei; Zhang, Shaohua; Lou, Langhong
2019-10-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume805Pages:218-228
AbstractThe freckle formation and evolution in directionally solidified single-crystal specimens with different thicknesses and abruptly expanding rectangular cross-section were investigated at different withdrawal rates. The microstructure was studied by optical microscope (OP) and scanning electron microscope (SEM), and the crystallographic orientation in freckle areas was characterized by electron backscattered diffraction (EBSD). The experimental results showed that the freckle was the most severe in specimens with a thickness of 10 mm at the same withdrawal rate, and the freckle chain was observed to form below an abruptly expanding cross-section ended at the expanding step. It was found that freckles formed exclusively on the edges of casting facing the central sprue of the shell mould. Findings reveal that freckles tend to form at the highest position of the mushy zone, mainly due to the thermosolutal convection and the radial flow caused by feeding behavior in the mushy zone. The freckle formation is pronounced at a low withdrawal rate, and can further generate stray grains. (C) 2019 Elsevier B.V. All rights reserved.
KeywordNickel-based superalloy Crystal growth Freckle Abruptly expanding cross-section
Indexed BySCI
Language英语
WOS IDWOS:000482184100026
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80701
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Han, Dongyu,Jiang, Weiguo,Xiao, Jiuhan,et al. Investigation on freckle formation and evolution of single-crystal nickel-based superalloy specimens with different thicknesses and abrupt cross-section changes[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,805:218-228.
APA Han, Dongyu.,Jiang, Weiguo.,Xiao, Jiuhan.,Li, Kaiwen.,Lu, Yuzhang.,...&Lou, Langhong.(2019).Investigation on freckle formation and evolution of single-crystal nickel-based superalloy specimens with different thicknesses and abrupt cross-section changes.JOURNAL OF ALLOYS AND COMPOUNDS,805,218-228.
MLA Han, Dongyu,et al."Investigation on freckle formation and evolution of single-crystal nickel-based superalloy specimens with different thicknesses and abrupt cross-section changes".JOURNAL OF ALLOYS AND COMPOUNDS 805(2019):218-228.
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