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Effect of TurboSwirl on Inclusions during Ingot Casting of Steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy. KTH Royal Inst Technol, Div Appl Proc Met, S-10044 Stockholm, Sweden..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2015 (English)In: Mathematical problems in engineering (Print), ISSN 1024-123X, E-ISSN 1563-5147, 805734Article in journal (Refereed) Published
Abstract [en]

The use of TurboSwirl to obtain an improved steel cleanliness during filling of an ingot was numerically studied by VOF and DPM models. It was found that a radius-reduced TurboSwirl or a proper tapered mold entrance nozzle with an adequate developed region for steel flow can reduce the risk of mold flux entrapment in a mold. The ingot casting process can create highly turbulent conditions inside the mold during the initial stages of casting. Since the TurboSwirl generates much calmer filling conditions it can promote separation of large nonmetallic inclusions. The TurboSwirl also collects large inclusions (200 mu m) towards the axis of rotation, which should promote agglomeration. In addition, the residence time for inclusions of small sizes can be prolonged, increasing chance of agglomeration, which indirectly promotes their separation from steel. Moreover, the average turbulent dissipation rate in an ingot casting swirl setup is about 40 % higher than that in a no swirl setup. This further facilitates the agglomeration of inclusions before they enter the mold. The removal of nonmetallic inclusions is thus enhanced because of an increasing inclusion collision rate due to both Stokes collisions and turbulent collisions, while maintaining a calm flow inside the mold.

Place, publisher, year, edition, pages
2015. 805734
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-173790DOI: 10.1155/2015/805734ISI: 000360544500001Scopus ID: 2-s2.0-84940840020OAI: oai:DiVA.org:kth-173790DiVA: diva2:854936
Funder
VINNOVA
Note

QC 20150918

Available from: 2015-09-18 Created: 2015-09-18 Last updated: 2017-12-04Bibliographically approved

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