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Inclusion flotation-driven channel segregation in solidifying steels
D. Z. Li; X. Q. Chen; P. X. Fu; X. P. Ma; H. W. Liu; Y. Chen; Y. F. Cao; Y. K. Luan; Y. Y. Li
2014
Source PublicationNature Communications
ISSN2041-1723
Volume5
AbstractChannel segregation, which is featured by the strip-like shape with compositional variation in cast materials due to density contrast-induced flow during solidification, frequently causes the severe destruction of homogeneity and some fatal damage. An investigation of its mechanism sheds light on the understanding and control of the channel segregation formation in solidifying metals, such as steels. Until now, it still remains controversial what composes the density contrasts and, to what extent, how it affects channel segregation. Here we discover a new force of inclusion flotation that drives the occurrence of channel segregation. It originates from oxide-based inclusions (Al2O3/MnS) and their sufficient volume fraction-driven flotation becomes stronger than the traditionally recognized inter-dendritic thermosolutal buoyancy, inducing the destabilization of the mushy zone and dominating the formation of channels. This study uncovers the mystery of oxygen in steels, extends the classical macro-segregation theory and highlights a significant technological breakthrough to control macrosegregation.
description.department[li, dianzhong ; chen, xing-qiu ; fu, paixian ; ma, xiaoping ; liu, hongwei ; chen, yun ; cao, yanfei ; luan, yikun ; li, yiyi] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; li, dz (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; dzli@imr.ac.cn
KeywordColumnar Solidification Model Macrosegregation Simulation Alloys Melt Convection Mechanism Behavior Mantle Front
URL查看原文
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/73264
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
D. Z. Li,X. Q. Chen,P. X. Fu,et al. Inclusion flotation-driven channel segregation in solidifying steels[J]. Nature Communications,2014,5.
APA D. Z. Li.,X. Q. Chen.,P. X. Fu.,X. P. Ma.,H. W. Liu.,...&Y. Y. Li.(2014).Inclusion flotation-driven channel segregation in solidifying steels.Nature Communications,5.
MLA D. Z. Li,et al."Inclusion flotation-driven channel segregation in solidifying steels".Nature Communications 5(2014).
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