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Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate
Alternative TitleHeat transfer and grain refining mechanism during melt treatment by cooling sloping plate
Guan Renguo; Zhao Zhanyong; Chao Runze; Huang Hongqian; Liu Chunming
2012
Source PublicationACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN1006-7191
Volume25Issue:4Pages:320-328
AbstractHeat transfer of flow melt and grain refining mechanism during melt treatment by the cooling sloping plate were investigated. The results show that the cooling sloping plate can refine riot only grains of alloys but also can obviously refine pure metal. Cooling ability of the plate is the key factor that induces grain refining, the plate material and the flow amount can affect cooling rate of the melt and thus affect refining effectiveness. The cooling rate of the melt on the cooling sloping plate is much faster than that of the conventional casting process, which can reach 1000 K/s and belongs to meta-rapid solidification scope. The thickness of the temperature boundary layer is much larger than that of the velocity boundary layer on the sloping plate, but the temperature gradient is small in the temperature boundary layer. Under strong cooling action by the cooling plate, most parts of the melt on the plate surface can form undercooling, which causes continuous eruptive nucleation, this is the main grain refining mechanism, and the heterogeneous nucleation on the plate surface is a helpful supplement for the nucleation.
Other AbstractHeat transfer of flow melt and grain refining mechanism during melt treatment by the cooling sloping plate were investigated.The results show that the cooling sloping plate can refine not only grains of alloys but also can obviously refine pure metal.Cooling ability of the plate is the key factor that induces grain refining,the plate material and the flow amount can affect cooling rate of the melt and thus affect refining effectiveness.The cooling rate of the melt on the cooling sloping plate is much faster than that of the conventional casting process,which can reach 1000 K/s and belongs to meta-rapid solidification scope.The thickness of the temperature boundary layer is much larger than that of the velocity boundary layer on the sloping plate,but the temperature gradient is small in the temperature boundary layer.Under strong cooling action by the cooling plate,most parts of the melt on the plate surface can form undercooling,which causes continuous eruptive nucleation,this is the main grain refining mechanism,and the heterogeneous nucleation on the plate surface is a helpful supplement for the nucleation.
KeywordALUMINUM-ALLOY MICROSTRUCTURE EVOLUTION STATE Grain refining Nucleation Cooling rate Sloping plate Temperature boundary layer
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Fok Ying Tong Education Foundation] ; [National Basic Research Program of China (973 program)]
CSCD IDCSCD:4621353
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/144991
Collection中国科学院金属研究所
Affiliation中国科学院金属研究所
Recommended Citation
GB/T 7714
Guan Renguo,Zhao Zhanyong,Chao Runze,et al. Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate[J]. ACTA METALLURGICA SINICA-ENGLISH LETTERS,2012,25(4):320-328.
APA Guan Renguo,Zhao Zhanyong,Chao Runze,Huang Hongqian,&Liu Chunming.(2012).Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate.ACTA METALLURGICA SINICA-ENGLISH LETTERS,25(4),320-328.
MLA Guan Renguo,et al."Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate".ACTA METALLURGICA SINICA-ENGLISH LETTERS 25.4(2012):320-328.
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