Effect of Pt doping on oxide scale formation on yttria-dispersion FeCrAl alloy at 1200℃

Huang, Taihong; Lu, Jian; Song, Peng; Khan, Asghar; Chen, Rong; Yi, Jianhong

doi:10.1016/j.corsci.2020.108580

Cited by 13 publications

(5 citation statements)

References 31 publications

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“…Such a big difference is particularly caused by the internal oxidation of grade A3, see Chapter 3.4. The oxide scale thicknesses of grades A1, A2 and A3 are quite similar to the ODS alloys PM 2000 [47], MA 956 [50] and binary Ni 30Cr alloy [35] at corresponding exposure times, respectively. The results of oxidation kinetics of the weight gain data are presented in Table 2.…”

Section: Oxidation Kineticsmentioning

confidence: 65%

“…This is also proved by the observed dominant growth of α-Al 2 O 3 layer via columnar grains into the substrate, i.e., the inward growth of the oxide scale. Dominant inward growth of α-Al 2 O 3 is referred for the alloys with various Al content at comparable conditions of exposure [48,50,52]. This is due to the excellent protective function of the single α-Al 2 O 3 film the oxidation rate gradually decreases with the thickening of the film.…”

Section: Discussion Of the Effect Of Al Content On Oxidization Mechanmentioning

confidence: 91%

“…This is due to the excellent protective function of the single α-Al 2 O 3 film the oxidation rate gradually decreases with the thickening of the film. The non-parabolic growth law of grades A1 and A2 seems to be a consequence of several factors, such as: the interference of the inter diffusion described by the thermodynamics models reported in [51,53,54], of the effect of the inter-diffusion of Al and Y elements and the columnar growth of α-Al 2 O 3 grains [48,50,52]. The presence of a relatively large amount of Y 2 O 3 nanoprecipitates in the system allows a significant modification of the oxide layer, because the phase diagram of the Al 2 O 3 -Y 2 O 3 binary system predicts the formation of three stoichiometric phases YAG, YAP (YAlO 3 ) and YAM (Y 4 Al 2 O 9 ) [55].…”

Section: Discussion Of the Effect Of Al Content On Oxidization Mechanmentioning

confidence: 98%

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The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C

Stratil

Horník

Dymáček

et al. 2020

Metals

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The aim of the paper is to evaluate the effect of aluminum content on the oxidation resistance of new-generation of oxide dispersion strengthened (ODS) alloy at 1200 °C. Three grades of the alloy of chemical composition Fe-15Cr-xAl-4Y2O3 with different Al contents x = 0.3 wt.%, 2.0 wt.% and 5.5 wt.% are prepared by mechanical alloying. The alloys are consolidated by high temperature rolling followed by heat treatment. To study the oxidation resistance the samples are isothermally aged in the air for 1 h, 4 h, 16 h and 64 h at 1200 °C. The oxidation kinetics, composition and formation mechanism of the oxide layers are analyzed. The weight gain of prepared steels is estimated. The kinetics of oxidation is studied on metallographic cross-sections of the exposed samples by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) analysis. The oxides on the surfaces are identified by X‑ray diffraction (XRD) analysis. The Al content significantly enhances the oxidation resistance of the alloy. For a sufficiently high Al content in the alloy a compact oxide layer of α‑Al2O3 on the surface is formed, which significantly suppresses further oxidation process.

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Section: Oxidation Kineticsmentioning

confidence: 65%

Section: Discussion Of the Effect Of Al Content On Oxidization Mechanmentioning

confidence: 91%

Section: Discussion Of the Effect Of Al Content On Oxidization Mechanmentioning

confidence: 98%

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The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C

Stratil

Horník

Dymáček

et al. 2020

Metals

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“…FeCrAl alloys are highly suitable for various high-temperature applications because of their outstanding oxidation resistance at elevated temperatures. [1][2][3][4][5] These applications depend on the formation of a slow-growing, stable, and continuous alumina scale, which prevents loss of metal by oxidation. However, the thermally grown alumina scale usually spalls off during oxidation, which lowers the oxidation life.…”

Section: Introductionmentioning

confidence: 99%

Effects of Zr Distribution on High‐Temperature Oxidation Resistance of a FeCrAlZr Alloy

Cao

Jiang

et al. 2022

steel research int.

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Two FeCrAlZr alloys are fabricated by twin‐roll strip casting (TRSC) and ingot casting (IC), and different Zr distributions are formed. After cyclic oxidation tests at 1200 °C for 200 h in air, it is found that the scale spallation resistance in the FeCrAlZr alloy is improved by homogenizing the Zr distribution by TRSC. To understand the improvement in oxidation resistance, the composition and microstructure of the thermally grown scales are investigated. During oxidation, Zr diffuses toward the scale and forms ZrO2 particles in the scale and at the surface of the oxide scale. Meanwhile, the outward diffusion of Zr inhibits the formation of interfacial voids and S segregation regardless of Zr distribution. However, the TRSC sample with a more uniform Zr distribution can form the high‐density oxide penetrations, keying the scale to the matrix and improving scale adhesion. The Zr fluxes toward the scales are calculated to explain the difference in the distribution of oxide penetrations in the TRSC and IC samples during oxidation.

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“…Due to the rising engine-inlet temperature, the protective coatings have to be able to serve in a more aggressive environment because the aluminide coating is easy to generate void, crack, and spallation during long-term servicing. The high temperature oxidation and corrosion resistance of aluminide coating can be enhanced by adding many elements (Montero et al, 2013;Zhao and Zhou, 2014;Yang et al, 2016;Huang et al, 2020). The common methods for preparing aluminide coating are thermal spray, pack cementation, chemical vapor deposition, and hot-dipping (Hu et al, 2006;Zhang et al, 2012;Cheng et al, 2013;Shirvani et al, 2013;Xu et al, 2015;Sitek et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

Zhang

Song

et al. 2021

Front. Mater.

Self Cite

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Aluminide coating is prepared on K438 Ni-based superalloy by pack cementation. The hot corrosion test of as-received and pre-oxidation aluminide coating in Na2SO4 salt are carried out at 1050°C. The coating morphologies, phase composition, and corrosion products are characterized by XRD, SEM, EDS, and TEM. The conclusion is that the pre-oxidation aluminide coating has excellent hot corrosion properties. After hot corrosion, the oxide scale of pre-oxidation aluminide coating is the thinnest and maintains good integrity. However, the oxide scale of as-received aluminide coating fluctuates greatly and there are corrosion cavities. CrS is formed in the alloy immediately below the oxide scale for the two coating systems.

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Effect of Pt doping on oxide scale formation on yttria-dispersion FeCrAl alloy at 1200℃

Cited by 13 publications

References 31 publications

The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C

The Influence of Aluminum Content on Oxidation Resistance of New-Generation ODS Alloy at 1200 °C

Effects of Zr Distribution on High‐Temperature Oxidation Resistance of a FeCrAlZr Alloy

Influence of Pre-Oxidation on High Temperature Oxidation and Corrosion Behavior of Ni-Based Aluminide Coating in Na2SO4 Salt at 1050°C

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