Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate

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	Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate
其他题名	Heat transfer and grain refining mechanism during melt treatment by cooling sloping plate
	Guan Renguo; Zhao Zhanyong; Chao Runze; Huang Hongqian; Liu Chunming
	2012
发表期刊	ACTA METALLURGICA SINICA-ENGLISH LETTERS
ISSN	1006-7191
卷号	25 期号:4 页码:320-328
摘要	Heat 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.
其他摘要	Heat 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.
关键词	ALUMINUM-ALLOY MICROSTRUCTURE EVOLUTION STATE Grain refining Nucleation Cooling rate Sloping plate Temperature boundary layer
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [Fok Ying Tong Education Foundation] ; [National Basic Research Program of China (973 program)]
CSCD记录号	CSCD:4621353
引用统计	被引频次：1[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/144991
专题	中国科学院金属研究所
作者单位	中国科学院金属研究所
推荐引用方式 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.