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An Investigation of Non-Metallic Inclusions in Different Ferroalloys using Electrolytic Extraction

Department of Materials Science and Engineering, KTH Royal Institute of Technology, Brinellvägen 23, 10044 Stockholm, Sweden
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Metals 2019, 9(6), 687; https://doi.org/10.3390/met9060687
Received: 16 May 2019 / Revised: 31 May 2019 / Accepted: 11 June 2019 / Published: 15 June 2019
(This article belongs to the Special Issue Inclusion/Precipitate Engineering in Steels)
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Abstract

Ferroalloys are integral constituents of the steelmaking process, since non-metallic inclusions (NMIs) from ferroalloys significantly influence the transformation of inclusions present in liquid steel or they are directly involved in casted steel. In this study, the characteristics of inclusions (such as the number, morphology, size, and composition) in different industrial ferroalloys (FeV, FeMo, FeB, and FeCr) were investigated using the electrolytic extraction (EE) technique. After extraction from the ferroalloy samples and filtration of the solution, the inclusions were investigated on a film filter. The three-dimensional (3D) investigations were conducted using a scanning electron microscopy in combination with energy dispersive spectroscopy (SEM-EDS). The characteristics of inclusions observed in the ferroalloys were compared with previous results and discussed with respect to their possible behaviors in the melt and their effects on the quality of the cast steels. The particle size distributions and floatation distances were plotted for the main inclusion types. The results showed that the most harmful inclusions in the ferroalloys investigated are the following: pure Al2O3 and high Al2O3-containing inclusions in FeV alloys; pure SiO2 and high SiO2-containing inclusions in FeMo alloys; Al2O3 and SiO2-containing inclusions in FeB alloys; and MnO-Cr2O3, Al2O3, and Cr2O3-based inclusions in FeCr alloys. View Full-Text
Keywords: ferroalloy; non-metallic inclusions; electrolytic extraction; steel quality ferroalloy; non-metallic inclusions; electrolytic extraction; steel quality
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Wang, Y.; Karasev, A.; Jönsson, P.G. An Investigation of Non-Metallic Inclusions in Different Ferroalloys using Electrolytic Extraction. Metals 2019, 9, 687.

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