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Towards an asymptotic framework for solidification shrinkage-induced macrosegregation in the continuous casting of binary alloys
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0002-8318-1251
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0001-9437-3550
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Casting of Metals.ORCID iD: 0000-0003-2449-9232
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The modelling of macrosegregation in the continuous casting of alloysnormally requires resource-intensive computational fluid dynamics(CFD). By contrast, here we develop an asymptotic framework for thecase when macrosegregation is driven by solidification shrinkage; as a firststep, a binary alloy is considered. Systematic asymptotic analysis of thesteady-state two-dimensional mass, momentum, heat and solute conservationequations in terms of the shrinkage parameter indicates that theoverall problem can be reduced to a hierarchy of decoupled problems: aleading-order problem that is non-linear, and a sequence of linear problems,with the actual macrosegregation of the solute then being determinedby means of one-dimensional quadrature.

National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-187872OAI: oai:DiVA.org:kth-187872DiVA: diva2:931695
Note

QC 20160608

Available from: 2016-05-30 Created: 2016-05-30 Last updated: 2016-06-08Bibliographically approved
In thesis
1. On the surface quality of continuously cast steels and phosphor bronzes
Open this publication in new window or tab >>On the surface quality of continuously cast steels and phosphor bronzes
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis work concerns about the importance of the cast surfaces, surface phenomenon such as the formation of the oscillation marks and exudation and related defects including cracks and segregation that happened during the continuous casting. All of the investigated materials were collected during the plant trials while an in-depth analysis on these materials was performed at the laboratory scale with certain explanations supported by the schematic and theoretical models. The work consists on different material classes such as steels and phosphor bronzes with a focus on the surface defects and their improvements. In order to facilitate the theoretical analysis which could be capable of explaining the suggested phenomenon in the thesis, a reduced model is developed which required lesser computational resources with lesser convergence problems.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 80 p.
Keyword
Continuous Casting, Steels, Ni-based alloy, Peritectic, Phosphor Bronzes, Simulation and Modeling
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering; Industrial Engineering and Management; Metallurgical process science
Identifiers
urn:nbn:se:kth:diva-187718 (URN)978-91-7729-019-3 (ISBN)
Public defence
2016-06-09, Kollegiesalen, Brinellvägen 8, SE-10044, KTH-Campus, Stockholm, 14:00 (English)
Opponent
Supervisors
Projects
Oscilation mark formation during continous casting of steel
Funder
Swedish Energy AgencyVINNOVAHelge Ax:son Johnsons stiftelse
Note

QC 20160527

Available from: 2016-05-30 Created: 2016-05-27 Last updated: 2016-05-30Bibliographically approved

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Vynnycky, MichaelSaleem, SaudFredriksson, Hasse
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