Effect of alloy grain size and silicon content on the oxidation of austenitic Fe-Cr-Ni-Mn-Si alloys in pure O2

Basu, Soumendra N.; Yurek, G. J.

doi:10.1007/bf00662967

Cited by 158 publications

(110 citation statements)

References 16 publications

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“…A number of investigations [1][2][3][4][5] have been carried out to improve the understanding of the growth mechanism of Cr 2 O 3 scales. The influence of grain size of the oxide [6][7] as well as the effect of doping by rate earth elements (e.g. yttrium or cerium) on the growth kinetics of Cr 2 O 3 have been carefully investigated and even the diffusion coefficients of chromium and oxygen in the bulk and along grain boundaries of Cr 2 O 3 are available.…”

Section: Introductionmentioning

confidence: 99%

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Trindade

Krupp²,

Hanjari³

et al. 2005

Mat. Res.

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Generally, oxide scales formed on high Cr steels are multi-layered and the kinetics are strongly influenced by the alloy grain boundaries. In the present study, the oxidation behaviour of an austenite steel TP347 with different grain sizes was studied to identify the role of grain-boundaries in the oxidation process. Heat treatment in an inert gas atmosphere at 1050 °C was applied to modify the grain size of the steel TP347. The mass gain during subsequent oxidation was measured using a microbalance with a resolution of 10 -5 g. The scale morphology was examined using SEM in combination with energy-dispersive X-ray spectroscopy (EDS). Oxidation of TP347 with a grain size of 4 µm at 750 °C in air follows a parabolic rate law. For a larger grain size (65 µm), complex kinetics is observed with a fast initial oxidation followed by several different parabolic oxidation stages. SEM examinations indicated that the scale formed on specimens with smaller grain size was predominantly Cr 2 O 3 , with some FeCr 2 O 4 at localized sites. For specimens with larger grain size the main oxide is iron oxide. It can be concluded that protective Cr 2 O 3 formation is promoted by a high density of fast grain-boundary diffusion paths which is the case for fine-grained materials.

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Section: Introductionmentioning

confidence: 99%

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Trindade

Krupp²,

Hanjari³

et al. 2005

Mat. Res.

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“…It has been often stated, that, in the absence of a bottom SiO 2 layer, the oxidegrowth rate for a closed oxide layer in the parabolic-growth regime is limited by outward diffusion of Cr cations through the Cr 2 O 3 scale [5,6]. The SiO 2 bottom layer might act as an additional diffusion barrier for Cr-cation outward diffusion, in particular recognizing the absence of grain boundaries in the amorphous SiO 2 layer [15,20,21]. It follows that then the effective parabolic-growth-rate constant for the Cr 2 O 3 layer should be lower in the presence of a SiO 2 bottom layer.…”

Section: Oxide-growth Kineticsmentioning

confidence: 99%

“…Although small additions of Si to Cr 2 O 3 -scale-forming steel are known to improve its high-temperature corrosion resistance (in particular, it enhances the reformation of a protective Cr 2 O 3 scale on the barealloy surface after oxide spallation [3,10,[12][13][14][15]), a fundamental understanding of this effect lacks [15][16][17][18]. The Si content corresponding with the maximum oxidation resistance (i.e., the longest breakaway oxidation time at constant temperature) appears to depend strongly on the steel microstructure [3,10,13,[19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Oxidation Behavior of Fe–25Cr–20Ni–2.8Si During Isothermal Oxidation at 1,286 K; Life-time Prediction

Bauer

Baccalaro

Jeurgens³

et al. 2008

Oxid Met

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The oxidation behavior of an austenitic steel, type 1.4841, with a Cr content of 25 wt% and a high-Si content of 2.8 wt% was studied during isothermal oxidation at 1,286 K in air. A thick, crystalline Cr 2 O 3 layer, on top of a much thinner, amorphous SiO 2 layer, developed on the alloy substrate. After formation of a closed Cr 2 O 3 scale, parabolic growth kinetics prevailed as long as the associated constant, steady-state Cr concentration in the alloy at the substrate/oxide interface of about 13 ± 1 wt% was maintained. Upon prolonged oxidation, successive cracking and spallation of the thickening oxide scale eventually led to breakaway oxidation, because the ''bulk-''Cr concentration in the interior of the alloy dropped below the critical value required to 'heal' the protective oxide layer after oxide spallation. Application of a lifetime prediction model of the alloy substrate under isothermal oxidation conditions allowed determination of the breakaway-oxidation time as a function of alloy-sheet thickness, by employing the Cr volume-diffusion coefficient in the alloy and the parabolic growth-rate constant, both determined in the present study by fitting calculated to experimental Cr-depletion profiles for various oxidation times.

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“…In the presence of sulfur, the chromia/alloy interface is stronger than for a silica/alloy interface. 29 This difference accounts for the fact that scale spallation occurred on cooling of Si-doped alloys, but not for undoped Fe-20Cr and Fe-20Cr-20Ni alloys, after reaction in sulfurbearing gas.…”

Section: Discussionmentioning

confidence: 99%

Sulfur Effect on Corrosion Behavior of Fe-20Cr-(Mn, Si) and Fe-20Ni-20Cr-(Mn, Si) in CO₂-H₂O at 650°C

Nguyen

Zhang

et al. 2015

J. Electrochem. Soc.

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Model alloys, , and these alloys doped with 0.5% Si or 2% Mn, were exposed to Ar-20%CO 2 -20%H 2 O-(0%, 0.1%, 0.5%, 1.0%)SO 2 gas mixtures at 650 • C. The reaction kinetics were analyzed gravimetrically and the reaction products were characterized using X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. In sulfurfree gases, thick iron-rich oxide scales and internal carbides formed on alloys of Fe-20Cr-(2Mn) and Fe-20Cr-20Ni-(0.5Si). Additions of SO 2 promoted the maintenance of protective chromia scale on these alloys, but had no benefit for the already highly corrosion resistant Fe-20Cr-0.5Si and Fe-20Cr-20Ni-2Mn alloys. The role of sulfur in retarding carburization is discussed with reference to its strong adsorption on oxide-metal interfaces and oxide grain boundaries.

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Effect of alloy grain size and silicon content on the oxidation of austenitic Fe-Cr-Ni-Mn-Si alloys in pure O2

Cited by 158 publications

References 16 publications

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Oxidation Behavior of Fe–25Cr–20Ni–2.8Si During Isothermal Oxidation at 1,286 K; Life-time Prediction

Sulfur Effect on Corrosion Behavior of Fe-20Cr-(Mn, Si) and Fe-20Ni-20Cr-(Mn, Si) in CO₂-H₂O at 650°C

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Effect of alloy grain size and silicon content on the oxidation of austenitic Fe-Cr-Ni-Mn-Si alloys in pure O2

Cited by 158 publications

References 16 publications

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Effect of alloy grain size on the high-temperature oxidation behavior of the austenitic steel TP 347

Oxidation Behavior of Fe–25Cr–20Ni–2.8Si During Isothermal Oxidation at 1,286 K; Life-time Prediction

Sulfur Effect on Corrosion Behavior of Fe-20Cr-(Mn, Si) and Fe-20Ni-20Cr-(Mn, Si) in CO2-H2O at 650°C

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Sulfur Effect on Corrosion Behavior of Fe-20Cr-(Mn, Si) and Fe-20Ni-20Cr-(Mn, Si) in CO₂-H₂O at 650°C