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Metals 2017, 7(2), 37; doi:10.3390/met7020037

The Effect of P on the Microstructure and Melting Temperature of Fe2SiO4 in Silicon-Containing Steels Investigated by In Situ Observation

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 Editor: Filippo Berto
Received: 28 November 2016 / Revised: 19 January 2017 / Accepted: 24 January 2017 / Published: 27 January 2017
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Abstract

In this study, two silicon-containing steels with different P contents were used, and reheating tests were conducted in an industrial furnace in a hot strip plant. The effect of P on the microstructure and melting temperature of Fe2SiO4 in silicon-containing steels was investigated using a backscattered electron (BSE) detector and energy-dispersive spectroscopy (EDS). The melting process of Fe2SiO4 was also observed in situ for the two steels with different P contents. The results show that the addition of P could lower the melting point of the eutectic compound Fe2SiO4/FeO, which is helpful for descaling the oxide scale. The melting point decreases with the increasing P content, and the melting point of Fe2SiO4/FeO can reduce up to 954.2 °C when the content of P reaches 0.115 wt %. Furthermore, P-compounds form in the dispersive particles located in the iron matrix near the interface between the matrix and inner oxide scale when the P content is relatively high. In addition, a method of in situ observation was proposed to study the effect of P on the melting point of Fe2SiO4/FeO in silicon-containing steel. The results are of more practical significance for the descaling of oxide scale in silicon-containing steel. View Full-Text
Keywords: in situ observation; Fe2SiO4; Fe3(PO4)2; melting temperature; dispersive particles in situ observation; Fe2SiO4; Fe3(PO4)2; melting temperature; dispersive particles
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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.; Hu, H. The Effect of P on the Microstructure and Melting Temperature of Fe2SiO4 in Silicon-Containing Steels Investigated by In Situ Observation. Metals 2017, 7, 37.

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