Oxidation of a Dispersion-Strengthened Powder Metallurgical FeCrAl Alloy in the Presence of O2 at 1,100 °C: The Influence of Water Vapour

Hellström, Kristina; Israelsson, Niklas; Mortazavi, N.; Canovic, Sead; Halvarsson, Mats; Svensson, Jan‐Erik; Johansson, Lars‐Gunnar

doi:10.1007/s11085-015-9534-7

Cited by 21 publications

(13 citation statements)

References 40 publications

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“…95 % N 2 . The chosen pre-oxidation conditions were studied more in detail by Hellström et al [18,19]. A short description of the obtained alumina scales can be found below.…”

Section: Resultsmentioning

confidence: 99%

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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The KCl-induced corrosion of the FeCrAl alloy Kanthal Ò APMT in an O 2 ? N 2 ? H 2 O environment was studied at 600°C. The samples were pre-oxidized prior to exposure in order to investigate the protective nature of alumina scales in the present environment. The microstructure and composition of the corroded surface was investigated in detail. Corrosion started at flaws in the pre-formed a-alumina scales, i.e. a-alumina was protective in itself. Consequently, KCl-induced corrosion started locally and, subsequently, spread laterally. An electrochemical mechanism is proposed here by which a transition metal chloride forms in the alloy and K 2 CrO 4 forms at the scale/gas interface. Scale de-cohesion is attributed to the formation of a sub-scale transition metal chloride.

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“…95 % N 2 . The chosen pre-oxidation conditions were studied more in detail by Hellström et al [18,19]. A short description of the obtained alumina scales can be found below.…”

Section: Resultsmentioning

confidence: 99%

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

et al. 2015

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“…The 6 wt% of Al in the investigated alloy is above the minimum Al concentration suggested for the formation of Al-rich oxide layers on FeCrAl alloys [33] and, indeed, the formation of an Al-rich oxide layer was evident after the different preoxidation treatments (Figures 1, 3 and 4). It is well documented [19][20][21]24,25,[33][34][35][36][37][38][39][40] that formation of any of the Al2O3 polymorphs (α-, γ-, δ-, θ-phase) is influenced by variables such as H2O in the environment, temperature and time. Earlier studies [22,24,32] have reported that α-Al2O3 formation is favoured at temperatures above 1050 o C, while at lower temperatures metastable polymorphs (δ-, γ-, θ-Al2O3) predominate.…”

Section: The Influence Of Preoxidation Conditionsmentioning

confidence: 99%

Influence of Preoxidation on High-Temperature Corrosion of a FeCrAl Alloy Under Conditions Relevant to Biomass Firing

et al. 2017

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Preoxidation of a commercial FeCrAl alloy (Kanthal APM) was evaluated as a surface modification approach to reduce alkali chloride induced corrosion during biomass firing in power plants. Samples of the alloy preoxidized at 900 o C in O2 or O2 + 10 vol % H2O, and at 1100 o C in O2, were coated with KCl and exposed at 560 o C to a gas mixture comprising of 12 vol % CO2, 6 vol % O2, 3 vol % H2O, 400 ppmv HCl and 60 ppmv SO2. The oxide formed at 1100 o C showed no reactivity with the corrosive species. In contrast, all samples preoxidized at 900 o C suffered severe attack, resulting in formation of Fe, Cr and Al containing corrosion products in a heterogeneous morphology, similar to non-preoxidized samples. The observed differences with respect to the degree of corrosion attack on the preoxidized samples are discussed in terms of the composition and thickness of the different types of Al2O3 layers obtained by the preoxidation treatment.

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“…This work is expected to lead to the development of correlations between microstructure and mechanical properties of APMT TM steel. This is relevant because recent studies [1,4,7] on this steel mostly focused on the oxidation/corrosion characteristics of this steel, not on its mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of accident-tolerant aluminum-bearing ferritic steels

Guria

Charit

2017

Annals of Nuclear Energy

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Tensile behavior of Kanthal APMT TM steel was studied over a temperature range from room temperature to 500 o C at three strain rates (10-4 , 10-3 and 10-2 s-1). Yield strength, ultimate tensile strength and percentage elongation to fracture were evaluated. Serrated plastic flow was observed in a specific temperature/strain rate regime, signifying occurrence of dynamic strain aging (DSA). Characteristic features of DSA such as plateau/peak in yield and tensile strength as a function of temperature, ductility minima and negative strain rate sensitivity were also observed. The activation energy of serrated flow was found to be affected by diffusion of interstitial impurity modified by high concentration of chromium. Microstructural examination and Vickers hardness testing were also performed on Kanthal APMT TM steel. Room temperature tensile properties of the APMT TM steel are compared with those of Goodfellow FeCralloy TM steel in the light of operating strengthening mechanisms.

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Oxidation of a Dispersion-Strengthened Powder Metallurgical FeCrAl Alloy in the Presence of O2 at 1,100 °C: The Influence of Water Vapour

Cited by 21 publications

References 40 publications

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Cyclic Corrosion and Chlorination of an FeCrAl Alloy in the Presence of KCl

Influence of Preoxidation on High-Temperature Corrosion of a FeCrAl Alloy Under Conditions Relevant to Biomass Firing

Tensile properties of accident-tolerant aluminum-bearing ferritic steels

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