High temperature oxidation of Fe13CrxAl alloys in vapour mixtures

Kvernes, I.; Oliveira, M.I.L.L.; Kofstad, Per

doi:10.1016/0010-938x(77)90049-x

Cited by 143 publications

(50 citation statements)

References 8 publications

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“…Surprisingly, the Al contents remaining in the coatings (0.5-1.1 at%) were even lower than that observed after failure at 700°C (also shown in Figure 7a). Based on prior work on Fe-Cr-Al alloys oxidized in wet air, 26,27 it was expected that the critical Al content (needed to form protective alumina) would be higher at 800°C compared to 700°C. This results suggests that the critical Al content needed for protective behavior may be inversely related to temperature.…”

Section: °C Oxidation Resultsmentioning

confidence: 99%

Performance of Al‐rich oxidation resistant coatings for Fe‐base alloys

Pint

Zhang

2010

Materials & Corrosion

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This multi-layer program has examined the oxidation resistance of Al-rich coatings made by chemical vapor deposition and pack cementation on ferritic-martensitic (e.g. T91, Fe-9Cr-1Mo) and austenitic (Type 304L, Fe-18Cr-8Ni) substrates at 650°-800°C. The main goal of this work was to demonstrate the potential benefits and problems with alumina-forming coatings. To evaluate their performance, oxidation exposures were conducted in a humid air environment where the uncoated substrates experience rapid oxidation, similar to steam. Exposure temperatures were increased to accelerate failure by oxidation and interdiffusion of Al into the substrate. The final results focused on thinner coatings with less Al and a ferritic Fe(Al) structure which have a lower thermal expansion than intermetallic phases. To improve the previously developed coating lifetime model, a final series of exposures were conducted to determine the effect of substrate composition (e.g. Cr content using Fe-12Cr and Fe-9Cr-2W substrates) and exposure temperature on the critical Al content for coating failure. For the coated Fe-(9-12)Cr specimens, there was little effect of Cr on lifetime at 800°C. At 700° and 800°C, thin coated austenitic specimens (304L and 316) continue to be protective at up to double the lifetime of a similar coating on T91. This increase could be attributed to the higher Cr content or the slower interdiffusion in austenitic substrates which is illustrated with electron microprobe measurements from thicker coatings stopped after 10-20 kh.

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Section: °C Oxidation Resultsmentioning

confidence: 99%

Performance of Al‐rich oxidation resistant coatings for Fe‐base alloys

Pint

Zhang

2010

Materials & Corrosion

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“…• The presence of water vapor adversely affects the selective oxidation of elements such as aluminum and chromium from iron-based alloys [45]. Water vapor also affects the selective oxidation of aluminum from TiAl [46].…”

Section: Surface Morphologies and Characteristics After Oxidation In mentioning

confidence: 99%

Water vapor effect on high-temperature oxidation behavior of Fe₃Al intermetallics

Chevalier

Juzoń

Przybylski

et al. 2009

Science and Technology of Advanced Materials

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Nb) were oxidized at 950• C in dry and humid (11 vol% water) synthetic air. Thermogravimetric measurements showed that the oxidation rates of the tested intermetallics were lower in humid air than in dry air (especially for Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb). The addition of small amounts of Zr, Mo or Nb improved the kinetics compared with that of the undoped Fe 3 Al. Fe 3 Al showed massive spallation, whereas Fe 3 Al-Zr, Fe 3 Al-Zr,Mo and Fe 3 Al-Zr,Mo,Nb produced a flat, adherent oxide layer. The rapid transformation of transient alumina into alpha alumina may explain the decrease in the oxidation rate in humid air.

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“…They can be classified into two main groups. One group concerns the deterioration of the mechanical property of a Cr 2 O 3 scale [5][6][7][8] . That is, invasion of water vapor into the substrate is caused by deterioration of the mechanical property of the Cr 2 O 3 scale accompanying the generation of cracks, which is due to dissolution of hydrogen into the Cr 2 O 3 scale or to an originally brittle property of it.…”

Section: Introductionmentioning

confidence: 99%