Three-dimensional investigations of inclusions in ferroalloys
2014 (English)In: Steel Research International, ISSN 1611-3683, Vol. 85, no 4, 659-669 p.Article in journal (Refereed) Published
As the requirements on material properties increase, there has been a demand on an additional knowledge on the effect of impurities in the ferroalloys on the properties. Thus, the number, morphology, size, and composition of inclusions in four different ferroalloys (FeTi, FeNb, FeSi, and SiMn) were investigated. This was done in three dimensions (3D) by using scanning electron microscopy in combination with energy dispersive spectroscopy after electrolytic extraction of the ferroalloy samples. The non-metallic and metallic inclusions were successfully analyzed on the surface of film filter. Thereafter, the particle size distribution was plotted for most of the non-metallic inclusions. The non-metallic inclusions were found to be REM oxides in FeTi, FeSi, and SiMn, Al2O3, Ti-Nb-S-O oxides in FeNb and silicon oxides in SiMn. Moreover, the intermetallic inclusions were found to be a Ti-Fe phase in FeTi, Ca-Si, and Fe-Si-Ti phases in FeSi and a Mn-Si phase in SiMn. In addition, the almost pure single metallic phases were found to be Ti in FeTi, Nb in FeNb, and Si in FeSi. As the requirements on material properties increase, the effect of impurities in ferroalloys on the steelmaking process is increasingly becoming more important. The characteristic of inclusions (morphology, number, size, and composition) in ferroalloys investigated in three-dimensional after electrolytic extraction is a good method for studying the evolution of inclusions during steelmaking.
Place, publisher, year, edition, pages
2014. Vol. 85, no 4, 659-669 p.
electrolytic extraction, ferroalloy, non-metallic and metallic inclusions, three-dimensional investigations
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-145665DOI: 10.1002/srin.201300157ISI: 000333909700018ScopusID: 2-s2.0-84898068584OAI: oai:DiVA.org:kth-145665DiVA: diva2:719501
QC 201405262014-05-262014-05-262014-06-09Bibliographically approved