Selective oxidation of Al rich Fe–Mn–Al–C low density steels

Jeong, TK; Jung, Geun Su; Lee, Kyoo Young; Kang, Youn-Bae; Bhadeshia, H. K. D. H.; Suh, Dong‐Woo

doi:10.1179/1743284713y.0000000485

Cited by 7 publications

(3 citation statements)

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“…Steels with Mn content lower than 7.5 wt.% formed layers consisting of Al 2 O 3 and Fe-like oxides, while the oxide layer was highly enriched in Mn for steels with Mn content greater than 7.5 wt.% [15]. It was also found that the formation of Al 2 O 3 and Mn-rich oxides essentially compete with each other [16]. Grain size also plays a role, as grain refinement accelerates phase transformation and promotes the rapid formation of Al 2 O 3 layers and slightly improves oxidation resistance [17].…”

Section: Introductionmentioning

confidence: 90%

“…Studies have been carried out on the high-temperature oxidation behaviour of Fe-Mn-Al-C steels. It was found that the addition of Al promotes the formation of an Al 2 O 3 layer, which prevents further oxidation and has a high protective effect [13][14][15][16][17][18]. Furthermore, an increasing C content increases the weight gain per unit area and the thickness of the oxide layer formed, which leads to the deterioration of the high-temperature oxidation resistance [13].…”

Section: Introductionmentioning

confidence: 99%

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High-Temperature Oxidation Behaviour of Duplex Fe-Mn-Al-Ni-C Lightweight Steel

et al. 2022

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Lightweight Fe-Mn-Al-Ni-C steels are an attractive material, due to the combination of low density, high elongation, and yield strength. However, the high Al content is also interesting from the point of view of high-temperature resistance. High-temperature resistance is important for high-temperature applications and oxidation during heat treatment. Oxidation tests at 700, 800 and 900 °C were carried out to investigate the oxidation rates. Oxidation at 700 °C resulted in slight decarburisation, which was reflected in a slight weight loss in the thermogravimetric analysis. In contrast, the weight in the thermogravimetric analysis increased at 800 and 900 °C and the kinetics followed a parabolic law. The higher the temperature, the more weight is gained and the thicker the oxide layer becomes. The oxidation layer at 800 and 900 °C consisted mainly of hematite and magnetite, with minor amounts of wüstite, alumina and hercynite. Preferential oxidation of austenite was also observed, as it has an increased Mn content. In addition, ferrite had an increased content of Al and Ni, which provide additional oxidation resistance.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

High-Temperature Oxidation Behaviour of Duplex Fe-Mn-Al-Ni-C Lightweight Steel

et al. 2022

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“…[5][6][7][8] The internal oxidation of alloying elements has been also an important subject with respect to the control of the continuous annealing condition, which is a reduction atmosphere to Fe. [9][10][11][12] However, the formation of alloy oxides in a high oxygen potential, in particular, the internal oxidation behaviour and the resultant concentration profile of alloying element beneath the external scale has rarely been investigated systematically. 13 In the present study, we examine the oxidation behaviour of Si-containing low-carbon steels in an atmospheric condition.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behaviour in Si-containing low-carbon steels

Choi

Park

Jeong

et al. 2017

Materials Science and Technology

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Oxygen partial pressure at the boundary between external oxidation layer and steel matrix was determined by characterisation of internal oxidation in Si-containing low-carbon steels oxidised under atmospheric condition. The oxygen partial pressure calculated from the rate equation of the internal oxidation matches with the equilibrium value between Fe and FeO. From the oxygen partial pressure between external oxidation layer and steel matrix, the evolution of internal oxidation zone and the diffusion profile of solute Si were numerically simulated. The calculated depth of internal oxidation and solute Si profile accords to the measured ones from the EPMA, which implies that the numerical simulation captures reasonably the evolution of the internal oxidation in the Si-containing steels.

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Critical Evaluations and Thermodynamic Optimizations of the MnO-Mn$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ and FeO-Fe$$_{2}$$O$$_{3}$$-MnO-Mn$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ Systems

Kang

Jung

2017

Metall Mater Trans B

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The crystal structure of annealed chevkinite-(Ce), ideally (REE,Ca) 4 Fe 2+ (Ti,Fe 3+ ,Nb) 4 Si 4 O 22 , monoclinic, C2/m, crystal (2 an) a 13.400(1), b 5.7232(4), c 11.0573(9) Å, 100.537(2)°, V 833.7(2) Å 3 and crystal (3 an) a 13.368(2), b 5.7243(6), c 11.041(1) Å, 100.516(1)°, V 830.7(2) Å 3 ; Z = 2, from Mongolia, has been solved by direct methods and refined to R 1 values of 6.3 and 5.7% using 1287 and 1180 unique (|F o | > 4F) reflections collected with a single-crystal diffractometer and MoK radiation. Electron-microprobe analysis gave: crystal (2 an) based on 13 cations per formula unit. Infrared spectra of unannealed crystals suggest significant radiation-induced damage. The structures of two unannealed crystals were refined, but there are major discrepancies (~13%) between the sums of the site-scattering values at the octahedrally coordinated M sites and the analogous values calculated from the chemical compositions determined by electron-microprobe analysis. These discrepancies were not present when data were collected on annealed crystals, indicating that the original crystals are partly metamict and that this can significantly affect the results of site-scattering refinement. In the crystal structure of chevkinite, there are two distinct (SiO 4) tetrahedra that share one vertex to form an [Si 2 O 7 ] group: = 1.614 (2 an) and 1.612 (3 an) Å, = 172.0° (2 an) and 170.6° (3 an). There are four octahedrally coordinated M sites that are occupied by small-to medium-sized divalent to pentavalent cations. The M(1) site is occupied dominantly by Fe 2+ with minor Mn 2+ , and the M(2), M(3) and M(4) sites are occupied by Ti, Fe 3+ and Nb. There are two A-sites that are occupied by REE and minor Ca and Th, with = 2.56 (2 an) and 2.55 (3 an) ([8]-coordinated) and 2.66 (2 an) and 2.55 (3 an) Å ([10]-coordinated). There are two crystallographically distinct rutile-like chains of octahedra ([M(3) + M(4)] and [M(2) + M(2)]) that extend in the b direction and link to form a layer of octahedra parallel to (001). The layers of octahedra link through [Si 2 O 7 ] groups to form a framework with two interstitial A sites, CN = [8] and [10], in which Ce is dominant over other REE, Ca and Th.

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Selective oxidation of Al rich Fe–Mn–Al–C low density steels

Cited by 7 publications

References 16 publications

High-Temperature Oxidation Behaviour of Duplex Fe-Mn-Al-Ni-C Lightweight Steel

High-Temperature Oxidation Behaviour of Duplex Fe-Mn-Al-Ni-C Lightweight Steel

Oxidation behaviour in Si-containing low-carbon steels

Critical Evaluations and Thermodynamic Optimizations of the MnO-Mn$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ and FeO-Fe$$_{2}$$O$$_{3}$$-MnO-Mn$$_{2}$$O$$_{3}$$-SiO$$_{2}$$ Systems

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