Inclusion flotation-driven channel segregation in solidifying steels

Channel 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 th...

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Main Authors:	Li, Dianzhong, Chen, Xing-Qiu, Fu, Paixian, Ma, Xiaoping, Liu, Hongwei, Chen, Yun, Cao, Yanfei, Luan, Yikun, Li, Yiyi
Format:	Online
Language:	English
Published:	Nature Pub. Group 2014
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4263320/

id	pubmed-4263320
recordtype	oai_dc
spelling	pubmed-42633202014-12-16 Inclusion flotation-driven channel segregation in solidifying steels Li, Dianzhong Chen, Xing-Qiu Fu, Paixian Ma, Xiaoping Liu, Hongwei Chen, Yun Cao, Yanfei Luan, Yikun Li, Yiyi Article Channel 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. Nature Pub. Group 2014-11-25 /pmc/articles/PMC4263320/ /pubmed/25422943 http://dx.doi.org/10.1038/ncomms6572 Text en Copyright © 2014, Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved. http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Li, Dianzhong Chen, Xing-Qiu Fu, Paixian Ma, Xiaoping Liu, Hongwei Chen, Yun Cao, Yanfei Luan, Yikun Li, Yiyi
spellingShingle	Li, Dianzhong Chen, Xing-Qiu Fu, Paixian Ma, Xiaoping Liu, Hongwei Chen, Yun Cao, Yanfei Luan, Yikun Li, Yiyi Inclusion flotation-driven channel segregation in solidifying steels
author_facet	Li, Dianzhong Chen, Xing-Qiu Fu, Paixian Ma, Xiaoping Liu, Hongwei Chen, Yun Cao, Yanfei Luan, Yikun Li, Yiyi
author_sort	Li, Dianzhong
title	Inclusion flotation-driven channel segregation in solidifying steels
title_short	Inclusion flotation-driven channel segregation in solidifying steels
title_full	Inclusion flotation-driven channel segregation in solidifying steels
title_fullStr	Inclusion flotation-driven channel segregation in solidifying steels
title_full_unstemmed	Inclusion flotation-driven channel segregation in solidifying steels
title_sort	inclusion flotation-driven channel segregation in solidifying steels
description	Channel 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.
publisher	Nature Pub. Group
publishDate	2014
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4263320/
_version_	1613166503489699840

Inclusion flotation-driven channel segregation in solidifying steels

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