Oxidation of iron-nickel aluminum alloys in oxygen at 600?800� C

Sakiyama, Minoru; Tomaszewicz, P.; Wallwork, G. R.

doi:10.1007/bf00609303

Cited by 48 publications

(13 citation statements)

References 19 publications

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“…The development of these phases is a function of temperature, a faster development was observed at higher temperature (725°C) than at lower (675°C). The formation was associated with a faster diffusion at higher temperature [20]. This statement is in agreement with the findings of Trindade et al [24] that a low concentration of Cr (17.5 wt%) is required to develop a Cr 2 O 3 oxide scale when Fe-Cr alloys exhibit a fine-grained microstructure.…”

Section: The Role Of W In Low-alloyed Steelssupporting

confidence: 77%

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Metal Loss of Steam-Oxidized Alloys after Exposures at 675°C and 725°C for 500 Hours

Dudziak¹,

Grobauer²,

Simms³

et al. 2015

High Temperature Materials and Processes

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The paper reports metal loss data and general overview of steam oxidation behaviour of the selected alloys in water steam under atmospheric pressure in temperature range of 675-725°C. In this research, T22, T23, TP347HFG, HR3C and 718 þ alloys were used. In this study, kinetics and metal loss data were obtained for better understanding corrosion degradation of the exposed materials. All the samples after 500-h exposure were characterized using environmental scanning electron microscopy (ESEM) in backscattered mode (BSE) with energy-dispersive x-ray spectroscopy (EDX). The results indicate that the highest corrosion degradation and metal loss were observed in T22, T23 alloys, moderate degradation was found in TP347HFG, whereas HR3C and 718 þ nickel-based alloy showed good corrosion resistance.

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Section: The Role Of W In Low-alloyed Steelssupporting

confidence: 77%

“…• Disruption or mechanical failure in an initially formed passive layer with subsequent short-circuit diffusion • The co-development of two different scale phases from the onset of exposure [20,21] The formation of volatile CrO 2 (OH) 2 It is believed that oxygen in eq. (3) comes from dissociation of steam:…”

Section: The Role Of W In Low-alloyed Steelsmentioning

confidence: 99%

Metal Loss of Steam-Oxidized Alloys after Exposures at 675°C and 725°C for 500 Hours

Dudziak¹,

Grobauer²,

Simms³

et al. 2015

High Temperature Materials and Processes

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show abstract

“…extended periods of time, combined with the lack of spallFrom the literature, there appears to be a lack of agreement ation, results in a very low rate of aluminum consumption concerning nodule nucleation and growth on Fe-based and may suggest a potentially long oxidation lifetime for alloys. [32][33][34][35][36][37] Available mechanisms [32,33,34] for this type of the weldable alloys at this temperature. growth in sulfur-containing environments are based primarWhile the alumina scale was able to maintain low weight ily upon scale disruptions or mechanical failures in an inigains for extended periods of time, it was also protective tially formed passive layer that cannot re-establish itself.…”

Section: Discussionmentioning

confidence: 99%

The effect of aluminum content on the corrosion behavior of Fe-Al alloys in reducing environments at 700 °C

Banovic

DuPont

Marder

2000

Metall Mater Trans A

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The high-temperature corrosion behavior of monolithic Fe-Al alloys, with 0 to 20 wt pct Al, was investigated at 700 ЊC in a reducing atmosphere ( p(S 2 ) ϭ 10 Ϫ4 atm, p(O 2 ) ϭ 10 Ϫ25 atm) for up to 100 hours. Postexposure characterization of the corrosion reaction products consisted of surface and cross-sectional microscopy, in combination with energy dispersive spectroscopy, electron probe microanalysis, and quantitative image analysis. From the kinetic data, three stages of corrosion behavior (i.e., inhibition, breakdown, and steady state) were found with the observance and/or duration of each stage directly related to the aluminum content of the alloy. The first stage, labeled the inhibition stage, was characterized by low weight gains and the absence of rapid degradation of the alloy. Typically observed for compositions with 10 to 20 wt pct Al, protection was afforded due to the development of a thin, continuous alumina scale. For alloys with 7.5 wt pct Al, the ability to maintain the initially formed alumina scale was not observed, resulting in the breakdown stage. Localized corrosion product nodules, containing iron sulfide (Fe 1Ϫx S) and the spinel-type tau phase (FeAl 2 S 4 ), developed through the alumina scale due to sulfur short-circuit diffusion. These growths were accompanied by relatively high corrosion rates. Further decreasing the aluminum content to 5 wt pct and below lead to the formation of a continuous sulfide scale whose growth was controlled by iron and sulfur diffusion through the previously formed product. The alloy wastage rates in the steady-state stage were relatively high when compared to the previous two regions.

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“…Oxidation experiments on ternary Al-Cr-Ni alloys were performed at temperatures over 1000 • C [50][51][52][53][54][55] and oxide maps were established on the basis of these results [55]. ␥-Al 2 O 3 , ␣-Al 2 O 3 and Ni(Al,Cr) 2 O 4 phases were found in the oxide scale of the Ni-15Cr-24Al (at.%) with Y and Zr additives oxidized at 1100 • C [56].…”

Section: Oxidation Of Al-cr-ni Alloysmentioning

confidence: 99%