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Effect of Ti De-oxidation on solidification and post-solidification microstructure in low carbon high manganese steel
CMU, USA.
JFE, Japan.
JFE, Japan.
Royal Institute of Technology, Sweden.
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2007 (English)In: ISIJ International, ISSN 0915-1559, Vol. 47, no 9, 1255-1264 p.Article in journal (Refereed) Published
Abstract [en]

This paper investigates the effect of de-oxidation inclusions on micro-structure in low-carbon steels. Low carbon (0.07 wt%), high Mn (0.9 wt%) steel in a Al2O3 or MgO crucible was deoxidized by adding either aluminum (0.05 wt%) or titanium (0.05, 0.03 or 0.015 wt%) in a 400 g-scale vacuum furnace, and cast in a Cu mold at cooling rates between 2.0–6.0 K/s.The oxide inclusions were identified as Al2O3 (1–3 μm) in the Al-killed steel and Ti–Al–(Mg)–O (0.3–0.5 μm) in the Ti-killed steel. Oxide inclusion sizes in all the Ti-killed steels were smaller and inclusion densities higher than those in the Al-killed steel.Solidification structure, defined as the density of primary dendrite arms within a defined region was finer with increasing inclusion density and as a result, the solidification structure of the Ti-killed steel was finer than that of the Al-killed steel.A Confocal Scanning Laser Microscope (CSLM) and a Differential Scanning Calorimeter (DSC) were used to study the differences in solid state micro-structural evolution between the Ti-killed, Al-killed and the non de-oxidized samples. The growth of austenite grains were studied under isothermal conditions and it was found that both grain-boundary mobility and final grain size were lower in the Ti-killed sample than for the others. With regards to austenite decomposition, during continuous cooling from a comparable austenite grain structure, the resulting austenite decomposition structure was finer for the Ti-killed sample due to a higher Widmanstätten lath density due to precipitation at particles in addition to grain boundaries.

Place, publisher, year, edition, pages
2007. Vol. 47, no 9, 1255-1264 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hj:diva-18898OAI: oai:DiVA.org:hj-18898DiVA: diva2:539259
Available from: 2012-07-03 Created: 2012-07-03 Last updated: 2014-03-20Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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  • de-DE
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