Study of magnetite film formation at metal-scale interface during cooling of steel products

Baud, Jean-Pierre; Ferrier, Alban; Manenc, J.

doi:10.1007/bf00603577

Cited by 41 publications

(37 citation statements)

References 4 publications

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“…5. The calculated line is consistent with the reported values, 18,19) which indicates the validity of formula (4).…”

Section: Discussionsupporting

confidence: 90%

“…As previously reported, 4,5,7) the phase transformation of FeO at 500°C undergoes with slow rate compared with 400°C. This is consistent with the slow bending progress in the case of 500°C soaking.…”

Section: Discussionsupporting

confidence: 74%

“…The phase transformation of FeO undergoes the following two-step reactions: 4 with lamellar structure appears, which corresponds to reaction (2). Now, we consider the volume change during the phase transformation of FeO.…”

Section: Discussionmentioning

confidence: 99%

“…Among them, the FeO transforms to a mixture of Fe 3 O 4 and Fe below 570°C, and the phase transformation behavior and the microstructure have been reported. [1][2][3][4][5][6][7][8][9] Because the phase transformation of FeO goes through the precipitation of Fe 3 O 4 in FeO matrix and eutectoid transformation, considerable stress and strain can occur in the scale, which has a possibility to affect the mechanical properties or adhesiveness of the scale. Especially, since the low scale adhesiveness results in the scale defects and deteriorates the surface quality of the hot-rolled steel-sheet products, understanding the stress or strain development in the scale during the phase transformation is industrially important.…”

Section: Introductionmentioning

confidence: 99%

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Strain Development in Oxide Scale during Phase Transformation of FeO

Tanei

Kondo

2017

ISIJ Int.

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Development of a strain in oxide scale during phase transformation of FeO was investigated by a flexure method. A pure iron foil was oxidized on only one side, and the formed FeO was transformed at 400 or 500°C. In-situ observation of the bending behavior of the foil-formed specimen during the phase transformation of FeO was performed. Compressive strain develops in the scale in the early stage of the phase transformation, following which a significantly large expansion strain develops. Such a strain development corresponds to the two-step phase transformation of FeO and can be explained by the volume change of the scale considering the non-stoichiometry of FeO.

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“…5. The calculated line is consistent with the reported values, 18,19) which indicates the validity of formula (4).…”

Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Strain Development in Oxide Scale during Phase Transformation of FeO

Tanei

Kondo

2017

ISIJ Int.

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“…was examined for isothermally annealed wüstite scale at below 843 K. 2,[4][5][6][7][8][9][10][11][12][13] The rate of this eutectoid reaction was reported the fastest at 673-753 K (400-480°C); it may depend on the scaling temperature, composition of the parent FeO, etc. According to the literature, incubation time of 100 s and more was required to start the reaction.…”

Section: Introductionmentioning

confidence: 99%

In-situ Measurements of Isothermal W^|^uuml;stite Transformation of Thermally Grown FeO Scale Formed on 0.048 mass% Fe by Synchrotron Radiation in Air

et al. 2013

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Isothermal wüstite transformation of thermally-grown FeO scale formed on 0.048 mass% Fe at 948 K for 180 s and annealed at 673, 723 K, and 773 K in air was studied in situ by synchrotron radiation. Wüs-tite transformation initiated right at the beginning of isothermal heating, either by the formation of a new phase of meta-stable iron-rich wüstite (at 673 and 723 K) or by direct transformation to magnetite (at 773 K). At 673 K, iron-rich wüstite replaced the parent wüstite thoroughly, and then transformed to magnetite and metal iron. At 723 K, formation of the iron-rich wüstite started as well, but the reaction was interrupted and was replaced by a gradual enrichment reaction of iron in both the parent and the iron-rich wüstite phases. Consumption of the parent wüstite and generation of magnetite accompanied. Wüstite transformation to generate magnetite and metal iron at 673 and 723 K was only possible for the iron-rich wüstite. At 673 and 723 K, incubation time was needed to initiate transformation of meta-stable iron-rich wüstite to magnetite and metal iron. Reaction to form the iron-rich wüstite from the parent wüstite was much easier. Tranformation of the iron-rich wüstite to magnetite and metal iron is considered a root cause for the formation of the lamellar structure and the magnetite seam in the scale. The transformation can well be interpreted from the analogy of the formation of the pearlite structure in steels.

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