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Formation and Growth Mechanism of Clusters in Liquid REM-alloyed Stainless Steels
KTH, School of Industrial Engineering and Management (ITM). (Processer)ORCID iD: 0000-0002-2377-2383
KTH, School of Industrial Engineering and Management (ITM). (Processer)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2015 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 55, no 11, 2358-2364 p.Article in journal (Refereed) PublishedText
Abstract [en]

REM-oxide clusters extracted from 253MA stainless steel grade samples from a pilot trial were investigated using a 2%TEA electrolyte. The samples were taken from liquid steel at different holding times after an addition of an appropriate amount of mischmetal. Thereafter, SEM in combination with EDS was deployed for three dimensional (3D) investigations of the characteristics of the extracted REM-oxide clusters. A reliable cluster size distribution (CSD) was obtained by improving the observation method and it was used to explicate the formation and growth mechanism of REM-oxide clusters. A correlation between morphology of clusters and their growth rate was found. This was used to divide the clusters into two different groups, which form and grow in accordance to different mechanisms. The results also show that the growth of clusters is governed by different types of collisions dependent up on size of the clusters. It has been concluded that for REM-oxide clusters turbulent collisions are the main controlling mode for the growth rate.

Place, publisher, year, edition, pages
2015. Vol. 55, no 11, 2358-2364 p.
Keyword [en]
REM clusters, electrolytic extraction, cluster size distribution, growth mechanism, collisions
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-180180DOI: 10.2355/isijinternational.ISIJINT-2015-293ISI: 000365372400012ScopusID: 2-s2.0-84948751922OAI: oai:DiVA.org:kth-180180DiVA: diva2:892705
Note

QC 20150111

Available from: 2016-01-11 Created: 2016-01-07 Last updated: 2016-01-11Bibliographically approved

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Nabeel, MuhammadKarasev, AndreyJönsson, Pär Göran
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