Effects of aluminum on the oxidation of 25Cr-35Ni cast steels

Belen, N.; Tomaszewicz, P.; Young, David J.

doi:10.1007/bf00656577

Cited by 32 publications

(19 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This value is very close to measurements made at 1000°C on a variety of cast heat resisting alloys [3,10,13]. If N ðsÞ o is controlled by equilibrium with the chromia scale, then it is calculated [10] from Eq. (7) clear that inward oxygen transport is very much faster than would be predicted for alloy matrix diffusion.…”

Section: Oxidationsupporting

confidence: 80%

“…However, large amounts of primary carbide were oxidised in situ 2Cr 23 as has been observed before in the oxidation of cast heat resisting steels [10,13]. As already noted, the depth of interdendritic oxidation was much greater than that of intradendritic silica precipitation.…”

Section: Oxidationsupporting

confidence: 58%

“…In most respects, the reaction products were the same as those produced by oxidation in non-carburising environments [3,10]: an external chromium-rich oxide scale, a chromium-depleted alloy subsurface region, interdendritic carbide oxidation and a shallow zone of internally precipitated oxides within the austenite dendrites. In addition, increased numbers of fine, secondary carbides formed in the interior of both alloys.…”

Section: Discussionmentioning

confidence: 90%

See 2 more Smart Citations

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

Xu¹,

Monceau²,

Young³

et al. 2008

Corrosion Science

View full text Add to dashboard Cite

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. b s t r a c tTwo commercial variants of the cast heat resistant grade HP40Nb (Fe-25Cr-35Ni, Nb modified) were exposed to CO/CO 2 gases at 982 and 1080°C in order to simulate exposure to the carbon and oxygen potentials realised in steam reformers under normal and overheated conditions. Both alloys developed external chromium-rich oxide scales, intradendritic silica precipitates and interdendritic oxide protrusions where primary, interdendritic carbides were oxidised in situ. Surprisingly, the lower silicon content alloy developed a more continuous internal silica layer, thereby slowing external scaling. Intradendritic oxidation was fast in both alloys, and is attributed to interfacial oxygen diffusion. Both alloys underwent rapid internal carburisation, indicating that their oxide scales failed to prevent carbon access to the underlying alloys under these reaction conditions.

show abstract

Section: Oxidationsupporting

confidence: 80%

Section: Oxidationsupporting

confidence: 58%

Section: Discussionmentioning

confidence: 90%

See 1 more Smart Citation

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

Xu¹,

Monceau²,

Young³

et al. 2008

Corrosion Science

View full text Add to dashboard Cite

show abstract

“…Transport in Internal Oxidation Zone Several works have shown that the oxygen permeability increases with increasing the solute concentration in IOZ of Ni-Al [8][9][10] and Fe-Al 7,11) systems. In these alloys, the oxides form acicular, rods or laths aligned with the diffusion direction.…”

Section: Effect Of Solute Concentration On the Oxygenmentioning

confidence: 99%

Oxygen Permeability through Internal Oxidation Zone in Fe–Cr Alloys under Dry and Humid Conditions at 973 and 1 073 K

et al. 2010

View full text Add to dashboard Cite

“…In addition to carbide dissolution and oxidation, internal silicon and aluminium oxides precipitate within the affected zone [6][7][8][9]. A consideration of the volume changes associated with these various events shows [8] that the volume of metal consumed by scale growth exceeds the volume change associated with internal oxidation, but the way in which the net volume loss is accommodated has never been established. This paper describes a microstructural investigation of the subsurface depletion zone developed by a cast heat resisting alloy during exposure to an oxidising-carburising gas.…”

Section: Introductionmentioning

confidence: 99%

Subsurface microstructural changes in a cast heat resisting alloy caused by high temperature corrosion

Oquab

Monceau

et al. 2010

Corrosion Science

View full text Add to dashboard Cite

OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author -deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 3807 b s t r a c tA cast HP ModNb alloy (Fe-25Cr-35Ni-1Nb, wt.%) was oxidised and carburised in CO-CO 2 corresponding to a C = 0.1 and p O 2 = 3 Â 10 À16 atm at 1080°C. Formation of an external, chromium-rich oxide scale led to depletion of this metal in a deep alloy subsurface zone. Within that zone, secondary chromium-rich carbides dissolved, primary carbides oxidised, solute silicon and aluminium internally oxidised, and extensive porosity developed. Pore volumes correspond to the difference between metal loss by scaling and metal displacement by internal oxidation, assuming the scale-metal interface to be fixed. The pores are concluded to be Kirkendall voids.

show abstract

Effects of aluminum on the oxidation of 25Cr-35Ni cast steels

Cited by 32 publications

References 22 publications

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

High temperature corrosion of cast heat resisting steels in CO+CO2 gas mixtures

Oxygen Permeability through Internal Oxidation Zone in Fe–Cr Alloys under Dry and Humid Conditions at 973 and 1 073 K

Subsurface microstructural changes in a cast heat resisting alloy caused by high temperature corrosion

Contact Info

Product

Resources

About