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Critical conditions for dendrite fragmentation of low carbon steel in travelling electromagnetic field
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2010 (English)In: Dongbei Daxue Xuebao/Journal of Northeastern University, ISSN 1005-3026, Vol. 31, no 12, 1717-1720+1732 p.Article in journal (Refereed) Published
Abstract [en]

To investigate the effect of travelling electromagnetic field on dendrite fragmentation in solidification process, the 0.22 wt%~0.34 wt%C steel was tested for its solidifying behavior in travelling electromagnetic field. Observing the solidification structures of casting blanks under different magnetic flux density, the distributions of secondary dendrite arm spacing were investigated and the functional relationship between secondary dendrite arm spacing and cooling rate in solidification was discussed, as well as the effect of travelling electromagnetic field on the columnar-to-equiaxed transition (CET) position. The solidification rate and solid fraction when CET occurs were calculated. The critical conditions for dendrite fragmentation in travelling electromagnetic field is derived and verified by the testing results of low carbon steel. Thus, the relationship between the average velocity of the liquid-phase and the critical solid volume fraction when CET occurs was obtained.

Place, publisher, year, edition, pages
2010. Vol. 31, no 12, 1717-1720+1732 p.
Keyword [en]
CET(columnar-to-equiaxed transition), Dendrite fragmentation, Secondary dendrite arm spacing, Solid fraction
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-150094ScopusID: 2-s2.0-78650956522OAI: diva2:741829

QC 20140829

Available from: 2014-08-29 Created: 2014-08-29 Last updated: 2014-08-29Bibliographically approved

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Nakajima, Keiji
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