Heterogeneous strip originated from the separate enriched melt: Innate character and physical mechanism

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	Heterogeneous strip originated from the separate enriched melt: Innate character and physical mechanism
	Ma, Xiaoping; Li, Dianzhong; Ma, XP (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Materials Sci, Shenyang 110016, Peoples R China.
	2016-07-01
发表期刊	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
ISSN	0017-9310
卷号	98 页码:558-567
摘要	The chemical heterogeneity, well-known as macrosegregation, is a major problem in the casting of steel ingots. Most heterogeneity generally originated from the solute partition and solute distribution in the solidification process with interdendritic convection. In this article, a new heterogeneous phenomenon originated from the movement of separate enriched melt is discovered in a steel ingot. A strip characterized as ferrite chains and MnS chains is revealed by macro-etching. The formation mechanism for the heterogeneous strip is proposed. In the mushy zone of the ingot, a large amount of separate S-enriched melts move laterally and upwards. Some S-enriched melts will remain in the moving trace. Such residual S-enriched melts produce a large amount of MnS inclusion chains. In the subsequent solid phase transition process, promoted by the MnS chains, ferrite prefers to be transited from the austenite near the MnS inclusions and shows as a large amount of separate ferrite chains. A large amount of ferrite chains align in a strip-like zone, which results in the heterogeneous strip phenomenon in macro-etching process. The physical model about the driving force for the movement of separate S-enriched melts is further theoretically analyzed. In the mushy zone, the interface tension resultant applied on the separate S-enriched melts can act as the drive force for the lateral movement of separate S-enriched melts. And the buoyance applied on the separate S-enriched melts acts as the drive force for the upwards movement. The interaction between the impurity movement and the solute segregation is also discussed. (C) 2016 Elsevier Ltd. All rights reserved.
部门归属	[ma, xiaoping ; li, dianzhong] chinese acad sci, inst met res, shenyang natl lab materials sci, shenyang 110016, peoples r china
关键词	Heterogeneous Strip Mushy Zone Separate Melt Movement Interface Tension Phase Transition
学科领域	Thermodynamics ; Engineering ; Mechanics
资助者	Youth Innovation Promotion Association of Chinese Academy of Sciences
收录类别	sci
语种	英语
WOS记录号	WOS:000375360600053
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75821
专题	中国科学院金属研究所
通讯作者	Ma, XP (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Materials Sci, Shenyang 110016, Peoples R China.
推荐引用方式 GB/T 7714	Ma, Xiaoping,Li, Dianzhong,Ma, XP . Heterogeneous strip originated from the separate enriched melt: Innate character and physical mechanism[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2016,98:558-567.
APA	Ma, Xiaoping,Li, Dianzhong,&Ma, XP .(2016).Heterogeneous strip originated from the separate enriched melt: Innate character and physical mechanism.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,98,558-567.
MLA	Ma, Xiaoping,et al."Heterogeneous strip originated from the separate enriched melt: Innate character and physical mechanism".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 98(2016):558-567.