Effect of thermal cycling on protective properties of alumina scale grown on thin Haynes 214 foil

Chyrkin, A.; Mortazavi, N.; Halvarsson, Mats; Grüner, Daniel; Quadakkers, W. J.

doi:10.1016/j.corsci.2015.06.020

Cited by 31 publications

(15 citation statements)

References 43 publications

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“…The instantaneous value for k′ w at 20 h (Fig. ) measured by thermogravimetry is higher than that observed on alumina forming materials such as Ni‐aluminides or the alumina forming wrought nickel base alloy 214 . This might be related to the presence of precipitates of various other oxides in the alumina scale (Fig.…”

Section: Discussionmentioning

confidence: 76%

Effect of alloy composition on the oxidation‐induced boron depletion in cast Ni‐base superalloy components

Nowak

Naumenko

Jalowicka

et al. 2016

Materials & Corrosion

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Cover: High temperature corrosion attack of the surface of a heat resistant high-alloy steel for boiler tubes (DMV304HCu) after exposure to a chlorine-free coal-power-plant ash at 625 °C for 1000 hours (cross section/false colors): Coal-power-plant ash containing sulphur, sodium, potassium, calcium and iron-rich oxides (dark red and violet); outer iron-rich oxide scale (yellow); inward growing chromia scale containing sulphur (turquoise); small chromium sulphides at the corrosion front in the metal subsurface zone (pink). The corrosion test was conducted within a project of DECHEMA-Forschungsinstitut to investigate accelerated hot-corrosion through co-fi ring of "green fuels" in conventional coal-fi red power plants. The project was funded by Federal Ministry for Economic Affairs and Energy (BMWi) under contract No. 03ET7012D. More detailed information on the project can be found at http://dechema-dfi .de/en/L%C3%BCbkorr.html Aim of the study is to develop a simulation software for the prediction of internal corrosion during high-temperature applications. Within this study, the cellular automata approach was used to describe TiN formation in Ni-20Cr-2Ti, MnO formation in a Mn-steel containing 3.7 wt% Mn and intergranular Al 2 O 3 formation in Inconel 625Si. It is shown that experimental and simulated results are in good agreement. EFC-Workshop: Insight, mechanisms and modelling in high temperature corrosion M. Schütze and W. J. Quadakkers As a fi rst step toward multicomponent simulations of oxidation, simulations of oxidation of pure iron has been performed. The simulations were performed using a modifi ed version of the homogenization model as implemented in Dictra using Calphad databases. A reasonable agreement with experimental data has been obtained. An alumina forming austenitic steel is exposed in a nitriding atmosphere. The internal nitridation is compared with thermodynamic and kinetic modelling. The order of appearing nitrides from the surface of the sample is predicted by the modelling. However, the cubic chromium nitride was not detected in the sample and the experimental nitridation depth is smaller than the modelled nitridation depth. Isothermal, 500 h exposures at 750 °C in 1-300 bar CO 2 found little effect of pressure on the mass change or reaction rates for a group of chromia-and alumina-forming structural alloys. In addition to examining polished cross-sections, macroscopic evaluations via hardness and ex situ tensile properties did not reveal any evidence of signifi cant internal carburization under these conditions. During exposure of alloy 625 in wet air at 900-1000 °C chromium loss due to formation of volatile Cr species increases with increasing gas fl ow rate up to the maximum considered value of 6 m/s. Geometrical factors of the test specimen substantially affected the extent of volatile species formation; especially the specimen leading edge exhibited more extensive formation of volatile Cr species than other specimen areas. 159-170 Effect of gas fl ow rate on oxidation behaviour of al...

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Section: Discussionmentioning

confidence: 76%

Effect of alloy composition on the oxidation‐induced boron depletion in cast Ni‐base superalloy components

Nowak

Naumenko

Jalowicka

et al. 2016

Materials & Corrosion

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“…The oxidation morphology of the CCAs was studied using SEM-STEM-EDXS (Figs. [3][4][5]. At both temperatures, the surface of AlTiVCr was fully covered by Ti-and V-rich oxides (Figs.…”

Section: Resultsmentioning

confidence: 96%

“…As such, the ability of high-temperature alloys to form an adherent, slow-growing and protective surface oxide (scale), nominally consisting of chromia (Cr2O3) and alumina (Al2O3), is essential for sustained high temperature and harsh environment exposure without premature failure [1,2]. Of the two family of high-temperature materials, i.e., alumina-and chromia-formers, alloys forming protective Al2O3 scales such as iron (Fe)-based (FeCrAls) [1], nickel (Ni)-based (NiCrAls) [3], cobalt (Co)-based (CoCrAls) [4] and nickel aluminates (NiAl)-type materials [5] are considered for applications with operating temperatures >900ºC. This is because α-Al2O3 scale possess several characteristics that are highly desired for the high-temperature oxidation performance of alloys including: (i) they grow very slowly, (ii) thermodynamic stability and (iii) chemically inert [1,2].…”

Section: Introductionmentioning

confidence: 99%

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

Esmaily¹,

Qiu²,

Bigdeli³

et al. 2020

Preprint

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Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multiprincipal element alloys (MPEAs), are being considered as a potential solution for many energyrelated applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two "opposing" alloys; namely a lightweight (5.06 g/cm 3 ) single-phase AlTiVCr CCA and a multiple-phase Al0.9FeCrCoNi CCA (6.9 g/cm 3 ). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900°C revealed that while AlTiVCr revealed linear oxidation, Al0.9FeCrCoNi tended to obey the desired parabolic rate law. However, postexposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al0.9FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.

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“…5a). The formation of voids cannot be attributed to cooling or to the volume change during the formation of the spinel from transient oxides, as discussed in [78], because they were absent in the case Cr90Fe10. Instead the voids are suggested to form due to a rather significant deformation of the anode as a consequence of Crdepletion in the alloy Cr70Fe30 (Fig.…”

Section: Compositional Analysis Of the Reaction Products After Electrmentioning

confidence: 98%

“…According to the phase diagram [76,77], at >1200°C, the two oxides chromia (Cr2O3) and alumina (Al2O3) are completely miscible, forming stable solid-solutions. It is key to note that the thermodynamically stable Al2O3-Cr2O3 solid-solutions are known for their superior mechanical properties and excellent thermal shock resistance, and hence, are widely utilized as corrosion resistant refractories in fibreglass furnaces, carbon black reactors, incinerators and wide range of solid waste vitrification processes as a corrosion resistance refractory [77][78][79]. The Mg-rich layer (Fig.…”

Section: Compositional Analysis Of the Reaction Products After Electrmentioning

confidence: 99%

Oxidation and electrical properties of chromium-iron binary alloys in a corrosive molten electrolyte environment

Esmaily¹,

Mortazavi²,

Birbilis³

et al. 2020

Preprint

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Chromium-iron (CrFe) binary alloys have recently been proposed to serve as the ʺinertʺ anode for molten oxide electrolysis (MOE). Herein, the effects of anodic polarization on physical and functional properties of CrFe anodes in the corrosive environment of MOE are studied via empirical observations and theoretical calculations. The findings indicate that the alloys form an inner chromia-alumina solid-solution covered by an MgCr2O4 spinel layer. A survey into the electrical properties of the detected oxides suggests that the layered oxide scale function as an efficient conductor of electricity at elevated temperature. The formation mechanism of the oxides is also investigated.

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Effect of thermal cycling on protective properties of alumina scale grown on thin Haynes 214 foil

Cited by 31 publications

References 43 publications

Effect of alloy composition on the oxidation‐induced boron depletion in cast Ni‐base superalloy components

Effect of alloy composition on the oxidation‐induced boron depletion in cast Ni‐base superalloy components

High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys

Oxidation and electrical properties of chromium-iron binary alloys in a corrosive molten electrolyte environment

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