Effect of carbon content on the oxidation behaviour of FeCrAlY alloys in the temperature range 1200–1300°C

Kochubey, V.; Badairy, H.; Coze, J. Le; Naumenko, D.; Tatlock, G. J.; Wessel, E.; Quadakkers, Willem J.

doi:10.1179/mht.2005.055

Cited by 4 publications

(2 citation statements)

References 14 publications

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“…6. This result indicates that the carbides are primarily formed during cooling, which is supported by thermodynamic calculations [13]. In addition to alloy matrix precipitation, the carbides in alloy "þ C" could locally be found at the scale/ metal interface of the chemically etched specimens, but they could also be verified on non-etched cross-sections by EDX-mapping (Fig.…”

Section: Resultssupporting

confidence: 65%

Effects of minor additions and impurities on oxidation behaviour of FeCrAl alloys. Development of novel surface coatings compositions

Kochubey

Al‐Badairy

Tatlock

et al. 2005

Materials and Corrosion

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In the present work the effects of single or combined minor additions of Zr, Hf, Ti and C on the oxidation behaviour of Y-containing, FeCrAl alloys have been studied. For this purpose high-purity, model alloys with single or multiple minor alloying additions were used. The results of long term discontinuous oxidation tests and detailed kinetics studies using thermogravimetry were complemented with extensive microstructural characterisation of the formed alumina scales using SEM and STEM. Hence, the oxidation kinetics and scale spallation rates and failure modes were correlated with the oxide composition and microstructure. The results demonstrate that the frequently reported positive effect of Zr, Hf and Ti on the lifetime oxidation behaviour of FeCrAl alloys can only be fully exploited if the concentrations of the above elements are carefully adjusted and the interaction with typical alloy impurities, such as carbon, is considered.

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Section: Resultssupporting

confidence: 65%

Effects of minor additions and impurities on oxidation behaviour of FeCrAl alloys. Development of novel surface coatings compositions

Kochubey

Al‐Badairy

Tatlock

et al. 2005

Materials and Corrosion

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“…Also some commercially available materials of the FeCrAl type may be considered as an example of such an alloy system: due to a minor carbon addition the alloys may contain precipitates of chromium rich carbide, i.e. a phase which does not contain the scale forming element aluminium [27].…”

Section: Introductionmentioning

confidence: 99%

Sub-Scale Depletion and Enrichment Processes During High Temperature Oxidation of the Nickel Base Alloy 625 in the Temperature Range 900–1000 °C

et al. 2010

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Numerous chromia-forming austenitic steels and nickel-base alloys contain chromium-rich strengthening precipitates, e.g. chromium-base carbides. During high temperature exposure the formation of the chromia base oxide scale results in chromium depletion in the alloy matrix and consequently in dissolution of the strengthening phase in the sub-surface zone. The present study describes the oxidation induced phase changes in the chromium depletion layer in case of alloy 625, a nickel base alloy in which the strengthening precipitates contain hardly any or only minor amounts of chromium. Specimens of alloy 625 were subjected to oxidation up to 1000 h at 900 and 1000°C and analyzed in respect to oxide formation and microstructural changes using light optical microscopy, scanning electron microscopy, energy and wavelength dispersive analysis, glow discharge optical emission spectroscopy, and X-ray diffraction. In spite of the fact that the alloy precipitates d-Ni 3 Nb and/or (Ni, Mo) 6 C contain only minor amounts of chromium, the oxidation induced chromium depletion results in formation of a wide sub-surface zone in which the precipitate phases are depleted. However, in parallel, substantial niobium diffusion occurs towards the alloy surface resulting in formation of a thin layer of d-Ni 3 Nb phase adjacent to the alloy/oxide interface. By modeling phase equilibria and diffusion processes using Thermo-Calc and DICTRA it could be shown that the phase changes in the sub-scale zone are governed by the influence of alloy matrix chromium concentration on the thermodynamic activities of the other alloying elements, mainly niobium and carbon. The d-phase depletion/ enrichment process is caused by a decreasing niobium activity with decreasing chromium concentration whereas the (Ni,Mo) 6 C dissolution finds its cause in the increasing carbon activity with decreasing chromium content.A. Chyrkin (&) Á P. Huczkowski Á V. Shemet Á L. Singheiser Á W. J. Quadakkers

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A Study of the Oxidation of Gd-Doped FeCrAl in 1000 °C Steam Environments

Liu

Sun

Guo

et al. 2022

J. of Materi Eng and Perform

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Effect of carbon content on the oxidation behaviour of FeCrAlY alloys in the temperature range 1200–1300°C

Cited by 4 publications

References 14 publications

Effects of minor additions and impurities on oxidation behaviour of FeCrAl alloys. Development of novel surface coatings compositions

Effects of minor additions and impurities on oxidation behaviour of FeCrAl alloys. Development of novel surface coatings compositions

Sub-Scale Depletion and Enrichment Processes During High Temperature Oxidation of the Nickel Base Alloy 625 in the Temperature Range 900–1000 °C

A Study of the Oxidation of Gd-Doped FeCrAl in 1000 °C Steam Environments

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