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Metals 2016, 6(4), 94; doi:10.3390/met6040094

The Effect of the Si Content on the Morphology and Amount of Fe2SiO4 in Low Carbon Steels

The State Key Laboratory of Refractories and Metallurgy, Hubei Collaborative Innovation Center for Advanced Steels, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan 430081, China
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Academic Editors: Vineet V. Joshi and Alan Meier
Received: 3 March 2016 / Revised: 8 April 2016 / Accepted: 12 April 2016 / Published: 22 April 2016
(This article belongs to the Special Issue Oxidation of Metals)
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Abstract

In order to study the effect of the Si content on the morphology, amount, and distribution of fayalite (Fe2SiO4), three low-carbon steels with different Si contents were selected, and reheating tests were conducted in an industrial furnace in a hot strip plant. The results show that Si distributes in two forms—first, Fe2SiO4, in the innermost layer of the oxide scale, and, second, granular SiO2, dispersively distributed in the matrix near the scale. In addition, Fe2SiO4 appears in a net-like form in the innermost layer of the oxide scale close to the iron matrix when the Si content is 1.21 wt. %. However, no obvious net-like Fe2SiO4 is observed when the Si content is less than 0.25 wt. %. Moreover, the inhibition effect of the solid Fe2SiO4 on the oxidation reaction plays a more important role than the promotion effect of the liquid Fe2SiO4 during the entire oxidation reaction. Therefore, the total thickness of the scale decreases with the increase in Si content. View Full-Text
Keywords: Si content; oxide scale; Fe2SiO4; X-ray diffraction Si content; oxide scale; Fe2SiO4; X-ray diffraction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yuan, Q.; Xu, G.; Zhou, M.; He, B. The Effect of the Si Content on the Morphology and Amount of Fe2SiO4 in Low Carbon Steels. Metals 2016, 6, 94.

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