Lifetime extension of FeCrAlRE alloys in air: Potential roles of an enhanced Al-reservoir and surface pre-treatment

Bennett, M. J.; Nicholls, John; Simms, N.J.; Naumenko, D.; Quadakkers, W. J.; Kochubey, V.; Fordham, R.J.; Bachorczyk, R.; Goossens, D.; Hattendorf, Heike; Smith, A. Burwood; Britton, Diane F.

doi:10.1002/maco.200503916

Cited by 14 publications

(9 citation statements)

References 14 publications

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“…Several values on the critical Al concentration have been reported, varying between close to 1 wt% and about 3.5 wt% at 1200-1300 8C [11][12][13]. The highest critical Al concentrations are reported for RE-free FeCrAl alloys while the lowest critical Al concentration are reported for wrought RE containing materials like Kanthal AF.…”

Section: Introductionmentioning

confidence: 96%

“…Generally there exists a critical aluminium concentration in the FeCrAl alloy when a protective alumina layer no longer is able to form. However, this critical aluminium concentration has no fix value, but depends on factors like temperature, exact relative alloy composition of Fe, Cr and Al, type of reactive elements (REs) added, oxidation environment as well as the processing of the alloy [11][12][13]. Generally a higher Al concentration in the alloy will prolong the time to breakaway oxidation, i.e.…”

Section: Introductionmentioning

confidence: 99%

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High temperature oxidation of FeCrAl‐alloys – influence of Al‐concentration on oxide layer characteristics

Engkvist

Bexell

Grehk

et al. 2009

Materials & Corrosion

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The superior high temperature oxidation resistance of FeCrAl alloys relies on the formation of a dense and continuous protective aluminium oxide layer on the alloy surface when exposed to high temperatures. Consequently, the aluminium content, i.e. the aluminium concentration at the alloy-oxide layer interface, must exceed a critical level in order to form a protective alumina layer. In the present study the oxidation behaviour of six different FeCrAl alloys with Al concentrations in the range of 1.2-5.0 wt% have been characterised after oxidation at 900 8C for 72 h with respect to oxide layer surface morphology, thickness and composition using scanning electron microscopy, energy dispersive X-ray spectroscopy and Auger electron spectroscopy. The results show that a minimum of 3.2 wt% Al in the FeCrAl alloy is necessary for the formation of a continuous alumina layer. For Al concentrations in the range of 2.0-3.0 wt% a three-layered oxide layer is formed, i.e. an oxide layer consisting of an inner alumina-based layer, an intermediate chromia-based layer and an outer iron oxide-based layer. In contrast, the 1.2 wt% Al FeCrAl alloy is not able to form a protective oxide layer inhibiting extensive oxidation.

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Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

High temperature oxidation of FeCrAl‐alloys – influence of Al‐concentration on oxide layer characteristics

Engkvist

Bexell

Grehk

et al. 2009

Materials & Corrosion

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“…In a number of high temperature applications the mentioned alloys are used as construction materials in extremely thin components (some tenths of a mm), e.g., foils, tubes, wires or rods. Due to the limited Al reservoir [22] such thin-walled components may after a certain time suffer from a critical Al depletion and eventually breakaway oxidation [19,[23][24][25], i.e., rapid oxidation of a less noble base element such as iron or nickel. The time to occurrence of breakaway is generally considered to be the lifetime limit for such thin-walled components.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…This The extent to which alloy composition and sample thickness influence the above described results is not known. Indeed, it is known that transient alumina formation is strongly dependent on those variables [19,20]. The sample composition (Aluchrom YHfAl) and thickness (50 lm foil) used in the present study were chosen due to their strong sensitivity to transient alumina formation, thus enabling clear observation of the growth phenomena.…”

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On the Competitive Growth of Alpha and Transient Aluminas During the First Stages of Thermal Oxidation of FeCrAl Alloys at Intermediate Temperatures

et al. 2008

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Many studies have been devoted to the oxidation of FeCrAl alloys in the intermediate temperature range 850-950°C, where ''abnormal'' oxide growth is observed [1][2][3]. This phenomenon has been described as a transition period in which the outward growth of metastable cubic aluminas is more rapid than the inward growth of the stable rhombohedral a-alumina, which effectively protects this type of alloy up to 1200°C. The consequently more rapid consumption of aluminum from the alloy due to metastable Al 2 O 3 growth is particularly detrimental in situations where thin metallic foils have to be used, as in the case of catalyst supports in exhaust systems of combustion engines [4][5][6], and has to be understood and suppressed or reduced.Previous studies have generally concluded that the transient metastable aluminas, characterized to be c, d and/or h modifications depending on alloy, temperature and characterization technique used [7], quickly form in the first minutes of oxidation and grow showing typical needle or platelet shapes. Kinetics follow near parabolic behavior, with high rate constants (k p s), extensively reported in the literature; see for example [8]. These alumina modifications are all stable regarding their formation

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Lifetime extension of FeCrAlRE alloys in air: Potential roles of an enhanced Al-reservoir and surface pre-treatment

Cited by 14 publications

References 14 publications

High temperature oxidation of FeCrAl‐alloys – influence of Al‐concentration on oxide layer characteristics

High temperature oxidation of FeCrAl‐alloys – influence of Al‐concentration on oxide layer characteristics

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

On the Competitive Growth of Alpha and Transient Aluminas During the First Stages of Thermal Oxidation of FeCrAl Alloys at Intermediate Temperatures

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