Mechanism of Magnetite Seam Formation and its Role for FeO Scale Transformation

Shizukawa, Yuta; Hayashi, Shigenari; Yoneda, Suzue; Kondo, Yasumitsu; Tanei, Hiroshi; Ukai, Shigeharu

doi:10.1007/s11085-016-9638-8

Cited by 21 publications

(7 citation statements)

References 10 publications

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“…[12][13][14][15] Therefore, the research of phase transformation behavior of FeO in oxide scale has become a hotspot in recent years. [16][17][18][19][20][21][22][23] Based on the previous studies, it is worth noting that the chemical composition of steel also affects the phase transformation of FeO besides start cooling temperature, isothermal time and cooling rate. Shizukawa and Yoneda 21,24) proposed the effect of Mn, Au addition to steel on eutectoid transformation of FeO in oxide scale.…”

Section: Introductionmentioning

confidence: 99%

Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling

Cao

Lin

et al. 2018

ISIJ International

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Pre-oxidation in air at 750°C for 10 min, the plain carbon steels without Cr and containing 0.4 wt.% Cr tended to rapidly form oxide scale composed of outer Fe 3 O 4 layer and inner FeO layer. Moreover, a FeCr 2 O 4 layer was observed at the FeO/substrate interface on the steel containing Cr. A comparative study was carried out between the scales on the two steels in inert gas cooled from 350-600°C to room temperature at the cooling rate range of 1-40°C/min, to determine the effect of low concentration Cr addition on the phase transformation of FeO. Based on the cross-sectional morphologies of oxide scale during various cooling conditions, the relationship between cooling rate and start cooling temperature were constructed, and the area fraction of eutectoid structure was analyzed. The result shows that the transformation rate and area fraction of eutectoid structure in oxide scale on steel containing Cr were greater than that on steel without Cr, and then the nucleation, growth and 100% transformation region of eutectoid structure in oxide scale on steel without Cr were delayed. This study proposed two mechanisms to discuss the experimental results. Firstly, the formation of FeCr 2 O 4 layer reduced the consumption of O, and then prevented short-range uphill diffusion of Fe from FeO to substrate. Secondly, combined with the lamellar spacing in eutectoid structure and the Fe-Cr-O equilibrium phase diagram, the Cr addition increased the formation temperature of FeO in oxide scale, which provided sufficient driving force for eutectoid transformation during continuous cooling.

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Section: Introductionmentioning

confidence: 99%

Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling

Cao

Lin

et al. 2018

ISIJ International

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“…[16][17][18] Meanwhile, a large amount of micro-cracking in the oxide scale and the gap at oxide/ substrate interface were observed after 10% deformation. The width of micro-cracking and gap were 0.62-1.43 μm and 0.1-1 μm, respectively.…”

Section: Microstructure and Phase Composition Of Oxidementioning

confidence: 99%

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Cao

Lin

et al. 2017

ISIJ Int.

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“…Studies show that the iron oxide layer generated during hot rolling, quenching, tempering, and other heat treatments of steel generates losses of 7 to 10% of the total steel, causing an enormous waste of resources and a loss of economic benefits [4,5]. Some research to reduce the growth of the oxide layer in the hot rolling process and improve the oxidation resistance of steel focused on heating systems, the rolling process, and modifying the chemical composition of alloying elements [6][7][8]. In the hot-rolling process, the growth of the oxide layer occurs in three stages.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Oxide Growth at High Temperature in Low Carbon Steel

Arreola-Villa¹,

Vergara–Hernández

Solorio-Díaz

et al. 2022

Metals

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High-temperature surface oxidation kinetics were determined for low-carbon steel using a Joule heating device on hollow cylindrical specimens. The growth of the oxide layer was measured in situ between 800 and 1050 ∘C under isothermal oxidation conditions and in an air laboratory atmosphere (O2 = 20.3% and humidity = 42%). Through a laser and infrared measuring system, the expansion and temperature were measured continuously. From the data acquired, the oxidation kinetic parameters were obtained at different temperatures with a parabolic-type growth model to estimate the rate of oxide layer generation. The convergence degree of the data fitted with the oxidation model was acceptable and appropriately correlated with the experimental data. Finally, comparisons were made between the estimated kinetic parameters and those reported in the literature, observing that the activation energy values obtained are in the range of the reported values.

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Mechanism of Magnetite Seam Formation and its Role for FeO Scale Transformation

Cited by 21 publications

References 10 publications

Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling

Phase Transformation Behavior of Oxide Scale on Plain Carbon Steel Containing 0.4 wt.% Cr during Continuous Cooling

Effect of Cold Rolling before Hydrogen Reduction on Reduction Behavior and Morphologies of Oxide Scale on Hot-rolled Low-carbon Steel

Kinetic Study of Oxide Growth at High Temperature in Low Carbon Steel

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