Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel

Cao, Guangming; Liu, Xiaojiang; Sun, B.Z.; Liu, Zhenyu

doi:10.1016/s1006-706x(14)60051-0

Cited by 34 publications

(18 citation statements)

References 7 publications

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“…In general, the formation of the red scale is related not only to the content of Fe 2 SiO 4 , but also to its morphology and distribution. The formation mechanism of red scale has been reported in several studies [1][2][3][4][5][6][7][8]. Silicon reacts with oxygen diffusing into steel and precipitates as SiO 2 , which combines with FeO and then forms a separate phase called fayalite (Fe 2 SiO 4 ).…”

Section: Introductionmentioning

confidence: 99%

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

Yuan

Zhou

et al. 2017

Metals

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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 Fe 2 SiO 4 in silicon-containing steels was investigated using a backscattered electron (BSE) detector and energy-dispersive spectroscopy (EDS). The melting process of Fe 2 SiO 4 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 Fe 2 SiO 4 /FeO, which is helpful for descaling the oxide scale. The melting point decreases with the increasing P content, and the melting point of Fe 2 SiO 4 /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 Fe 2 SiO 4 /FeO in silicon-containing steel. The results are of more practical significance for the descaling of oxide scale in silicon-containing steel.

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Section: Introductionmentioning

confidence: 99%

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

Yuan

Zhou

et al. 2017

Metals

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“…Fourthly, wustite occurs with a broad composition range that can be described as Fe 1´x O, with x varying from 0.04 to 0.17 [11]. The ion transport through oxides is dominated by the stoichiometry of the oxide (wustite) that is p-type [26,29].…”

Section: Oxidation Analysismentioning

confidence: 99%

“…Below 570˝C, only the last two layers are thermodynamically stable. Cao et al [11] investigated the isothermal oxidation kinetics of low carbon steel at temperatures ranging between 500˝C and 900˝C. They reported that the oxidation mass gain per unit area with time has a parabolic relation and that the oxidation rate decreases with time.…”

Section: Introductionmentioning

confidence: 99%

Effect of Oxidation Temperature on the Oxidation Process of Silicon-Containing Steel

Zhou

et al. 2016

Metals

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Abstract:The oxidation behavior of silicon-containing steel was studied by applying segmented heating routes similar to the atmosphere and heating process in an industrial reheating furnace. The oxidation tests were carried out on a simultaneous thermal analyzer at heating temperatures of 1150˝C-1300˝C. The morphologies of Fe 2 SiO 4 were observed by SEM, and the penetration depths of the Fe 2 SiO 4 layer at different oxidation temperatures were determined by using the Image-Pro Plus 6.0 software. The results show that at heating temperatures ě1235˝C, the oxidation rate and total oxidation mass gain have no relation with the heating temperature; the mass gain versus time follows a linear law after about 1164˝C (lower than the eutectic temperature of fayalite). In addition, the oxidation rate first decreases slowly and then drops from 1190˝C to 1210˝C during the isothermal holding stage. With the increase in temperature, the oxidation rate and mass gain also increase gradually; the relationship between the mass gain and time is close to a parabolic law. Moreover, at a heating temperature of 1150˝C, the oxidation rate decreases rapidly during the isothermal holding stage, and the mass gain versus time follows a parabolic law.

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“…It has been reported that for pure iron, the initial oxidation rate in short times is determined by the chemical reactions between oxygen atoms at the surface of the metal and adsorbed oxidizing species . On the contrary, the diffusion of ionic species, such as oxygen, throughout the oxide layers is the rate controlling factor for the aforementioned phases …”

Section: Introductionmentioning

confidence: 99%

“…[8] On the contrary, the diffusion of ionic species, such as oxygen, throughout the oxide layers is the rate controlling factor for the aforementioned phases. [8,13] However, it has been reported that the growth rate of hematite depends on oxygen diffusion due to the abundance of oxygen close to the surface and that of wustite and magnetite mainly depends on the diffusion of cations, as they are closer to the base metal. [13,14] However, the growth mechanism for each of these three layers is still not well documented.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nickel on High‐Temperature Oxidation and Characteristics of Oxide Layers in Two High‐Strength Steels

Vedaei-Sabegh

Morin²,

Jahazi

2019

steel research int.

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The oxidation behaviors of two high‐strength medium carbon steels with different Ni concentrations are investigated by means of differential thermal analysis equipped with thermogravimetry (TG). Four different oxidation temperatures and five oxidation times are tested. A parabolic behavior is observed for the oxide growth in both alloys; however, the relative increases in the oxidation rate from one temperature to another are not similar for both alloys, and the oxidation kinetics of the Ni‐rich steel are significantly lower than those of the low Ni alloy. On the basis of the TG results, the activation energy for the oxidation of the two alloys is determined. The influence of Ni content on the microstructure and characteristics of the different oxide layers is studied using a combination of laser confocal microscopy, electron microscopy, and X‐ray diffraction (XRD) analysis. The results revealed a clear influence of Ni on the nature and relative presence of different oxide layers. The results are interpreted in terms of the influence of Ni on the diffusion of oxygen through the oxide layer.

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Morphology of Oxide Scale and Oxidation Kinetics of Low Carbon Steel

Cited by 34 publications

References 7 publications

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

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

Effect of Oxidation Temperature on the Oxidation Process of Silicon-Containing Steel

Influence of Nickel on High‐Temperature Oxidation and Characteristics of Oxide Layers in Two High‐Strength Steels

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