Observations of nodule growth during the oxidation of pure binary iron-aluminum alloys

Tomaszewicz, P.; Wallwork, G. R.

doi:10.1007/bf00666643

Cited by 117 publications

(52 citation statements)

References 11 publications

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“…Comparison of weight gains of Fe-Al alloys with that of the Fe-Al-C alloy having the same Al content would bring out the effect of carbon on oxidation. Tomaszewicz et al have reported a weight gain of 0.2 mg/cm 2 in the Fe-6Al alloy when oxidised at 800 C for 25 h [20], while alloy 3 of the present study, having 8%Al, shows 2 mg/cm 2 for similar oxidation conditions, an order of magnitude higher than that of the former. This difference can be attributed to the presence of carbon in alloy 3.…”

Section: Discussioncontrasting

confidence: 49%

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

2002

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Iron aluminides produced by the electroslag refining technique, having the compositions: (1) Fe-16Al-1C, (2) Fe-10Al-1C, and (3) Fe-8Al-1C were used to investigate the effect of Al on the oxidation behaviour of the Fe-1C-Al system at 700 to 1000 C. Prior to oxidation studies, phase and microstructure of alloys were analysed. The carbide phase, Fe 3 AlC 0.69 , was found to be distributed in the Fe 3 Al matrix in alloy 1 and (Fe-Al) matrix in alloys 2 and 3. The low Al content alloys displayed inversion in the oxidation kinetics below 800 C, while, high Al content alloy displayed inversion phenomena at 1000 C. The mechanism involving inversion in oxidation kinetics was found to be different in the two cases. In the former, it was attributed to the preferential oxidation of Al, while in the latter, to the phase transformation within the Al 2 O 3 . Carbides in the alloy having low Al content showed instability during oxidation.

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Section: Discussioncontrasting

confidence: 49%

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

2002

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“…The oxidation resistance of Fe-40Al alloys in the temperature range of 1073-1473 K was studied by LANG [9], and the results revealed that Fe-Al intermetallic had excellent oxidation resistance at high temperature. It has been proposed that for a protective behavior at least 8% Al (mass fraction) is necessary at 1073 K [10]. Fe-2.5Al alloy (mass fraction) can form alumina scales which, however, are not fully protective due to the formation of iron oxides in a few period of time.…”

Section: Scale Microstructure and Compositionmentioning

confidence: 99%

The oxidation of Fe-30Al alloys in 1 atm of pure O2 at 973 K and 1173 K

Chen¹,

Xu²,

Li³

et al. 2016

Proceedings of the 2016 International Conference on Civil, Structure and Environmental Engineering

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Abstract. The isothermal oxidation of Fe-30Al alloys in 1 atm of pure O 2 at 973 K and 1173 K was investigated. Fe-30Al alloy oxidized slowly at 973 K but much faster at 1173 K, especially during the transient oxidation stage. The mass gain of the alloy at 973 K after 24 h oxidation is only about 0.1 mg/cm 2 , much smaller than the corresponding value of 0.6 mg/cm 2 at 1173 K, indicating that the oxidation resistance at 973 K is much better than that at 1173 K. The scales formed at both temperatures are mainly composed of Al 2 O 3 , coupled with a little Fe 2 O 3 . It is obviously that the protective Al 2 O 3 layer formed on Fe-30Al at 973 K show better homogeneity and integrality than that at 1173 K.

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“…8,9) This is composed of the following two steps: (1) the aluminum foil is bonded to the steel at temperatures below the melting point of aluminum, and (2) the aluminum-coated steel is held at temperatures above the melting point of aluminum, and then aluminizing is completed. This process also has an advantage that Ferich Fe-Al compounds like FeAl and Fe3Al, which have good mechanical properties and excellent oxidation resistance, [10][11][12][13] can be obtained by heat treatment at a relatively low temperature in a short time, because the amount of aluminum contributing to reactions with the steel is purposefully selected. Yamada et al have applied this process to the production of electric razor blades.…”

Section: Introductionmentioning

confidence: 99%

Aluminizing of High-carbon Steel by Explosive Welding and Subsequent Heat Treatment

2015

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A carbon steel plate containing 0.87 mass% C was coated with an aluminum foil with a thickness of 100 μ m by explosive welding. This aluminum-coated steel was heat-treated in the temperature range of 973-1 273 K for up to 7.2 ks in the air to investigate reactions between molten aluminum and high-carbon steel from the viewpoint of aluminide coating. An aluminized layer was basically composed of Fe2Al5, FeAl, Fe3Al containing carbon (Fe3Al(C)), and ferrite stabilized by aluminum diffusion (α-Fe(Al)). FeAl2 was detected with Fe2Al5 at heating temperatures of more than 1 223 K, whereas FeAl had two layers due to its chemical composition. In addition, defects like a crack and a void were observed in the vicinity of the FeAl/α-Fe(Al) interface after heating at 1 273 K for 3.6 ks. To reduce brittle Fe2Al5 and FeAl2 in the aluminized layer, the steel coated with aluminum with a thickness of 50 μ m was prepared and then heat-treated under the same conditions. At 1 173 K, the region consisting of FeAl, Fe3Al(C), and α-Fe(Al) accounted for a large part of the aluminized layer. This aluminized steel was subjected to quenching and tempering on the basis of features of the used bare steel. As a result, the hardness near the surface of the aluminized layer was approximately equal to that of the steel substrate.

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Observations of nodule growth during the oxidation of pure binary iron-aluminum alloys

Cited by 117 publications

References 11 publications

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

Effect of Al content on oxidation behaviour of ternary Fe–Al–C alloys

The oxidation of Fe-30Al alloys in 1 atm of pure O2 at 973 K and 1173 K

Aluminizing of High-carbon Steel by Explosive Welding and Subsequent Heat Treatment

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