Modification of the oxidation behavior of high-purity austenitic Fe-14Cr-14Ni by the addition of silicon

Kumar, Arun; Douglass, D. L.

doi:10.1007/bf00611695

Cited by 69 publications

(17 citation statements)

References 10 publications

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“…An amorphous silica layer, which was believed to act as a diffusion barrier to reduce iloxidation rates, has been detected [20][21][22] at oxide/alloy interfaces in alloys con_ning Si, and the presence of such a silica layer also increased scale spallation [21]. In the present study, the silica layer was never found to be continuous.…”

Section: Oxide Morphology and Compositi0ncontrasting

confidence: 40%

Oxidation Behavior of Co-15wt% Cr Alloy Containing Dispersed Oxides Formed by Internal Oxidation

1992

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Internal oxidation pretreatments of Co-15wt%Cr and Co-15wt%Cr-1 wt% Ti were carried out using a Rhines pack in quartz, in mullite, and in alumina. A dispersion of titanium oxide particles formed in the Ti-containing alloy as a result of the internal oxidation. However, silicon also diffused into all treated specimens when the pretreatments were carried out in quartz or in mullite. The effect of various pretreatments on the subsequent oxidation of these alloys was studied at 1,000°C and compared with that of a Co-15wt%Cr-1wt%Si alloy. The main purpose of this study was to determine the relative effectiveness of the dispersed oxide particles and the contaminated silicon on the selective oxidation of chromium. It was found that the oxidation behaviors of both treated alloys were strongly affected by the degree of silicon contamination. Selective oxidation of chromium to form a nearly continuous protective Cr2O3 scale was achieved with greater than 0.4 wt% silicon. The presence of dispersed particles reduced initial oxidation rate but was ineffective in promoting Cr2O3 scale formation.

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Section: Oxide Morphology and Compositi0ncontrasting

confidence: 40%

Oxidation Behavior of Co-15wt% Cr Alloy Containing Dispersed Oxides Formed by Internal Oxidation

1992

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“…Previous studies [21][22][23] have also shown that silicon facilitates the formation of a chroma scale. For example, Kumar and Douglass 21 studied the oxidation behavior of austenitic Fe-14Cr-14Ni steels containing up to 4 wt.% Si over the temperature range 900-1100 • C in air.…”

Section: Introductionmentioning

confidence: 85%

Effects of Silicon on the Oxidation Behavior of Ni-Base Chromia-Forming Alloys

Gleeson

2006

Oxid Met

119

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This paper compares and analyzes the oxidation behavior of Ni-base alloyswith and without about 2.7 wt.% Si addition. The Ni-base alloys studied were of two types: cast model alloys or wrought commercial alloys. Oxidation testing was conducted at 1000 • C in still air. The specific aspects studied were scale spallation resistance, nature by which the silicon oxidized, and the influence of silicon on the subsurface depletion behavior of chromium. From oxidation results of the cast model alloys, Si addition was found to improve oxidation resistance by forming a continuous SiO 2 layer at the alloy/scale interface, which resulted in decreased oxidation kinetics. The cast alloys with Si addition also showed larger average effective interdiffusion coefficients of chromium compared to the cast alloys without Si addition. As a consequence, the Si addition assisted in the establishment and re-formation of a chromia scale during oxidation. In the case of the wrought commercial alloys, a discontinuous distribution of SiO 2 precipitates in the vicinity of the alloy/scale interface was found to be beneficial to cyclic oxidation resistance.KEY WORDS: high temperature oxidation; silicon effect; chromia-former; Ni-base alloy; chromium depletion and interdiffusion behavior.

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“…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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Modification of the oxidation behavior of high-purity austenitic Fe-14Cr-14Ni by the addition of silicon

Cited by 69 publications

References 10 publications

Oxidation Behavior of Co-15wt% Cr Alloy Containing Dispersed Oxides Formed by Internal Oxidation

Oxidation Behavior of Co-15wt% Cr Alloy Containing Dispersed Oxides Formed by Internal Oxidation

Effects of Silicon on the Oxidation Behavior of Ni-Base Chromia-Forming Alloys

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

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