Evolution of carbides and chromium depletion profiles during oxidation of Alloy 602 CA

R. Pillai; H. Ackermann; H. Hattendorf; S. Richter

doi:10.1016/j.corsci.2013.05.013

Evolution of carbides and chromium depletion profiles during oxidation of Alloy 602 CA

R. Pillai, H. Ackermann, H. Hattendorf, S. Richter

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Abstract

The microstructure evolution in carbide strengthened Alloy 602 CA during exposure to a synthetic flue gas (N₂-2.5%O₂-8.6%H₂O-16.4%CO₂) at 1100°C has been studied. The chromium and aluminium loss resulted in a chromium depleted alloy subsurface area and the dissolution of the carbides within this area. An increase of the carbide fraction in the sample core was observed and quantified. Phase equilibria calculations revealed that the depletion of aluminium as well as that of chromium triggers carbon to leave the depleted area. The overall carbon depletion in that area corresponded to the observed increase in carbide fraction in the sample core.

Original language	English
Pages (from-to)	28-37
Number of pages	10
Journal	Corrosion Science
Volume	75
DOIs	https://doi.org/10.1016/j.corsci.2013.05.013
State	Published - Oct 2013
Externally published	Yes

Funding

The authors wish to thank the Bundesministerium für Wirtschaft und Technologie and the industrial partners for funding of the project under the program InnoNet.

Funders	Funder number
Bundesministerium für Wirtschaft und Technologie

Keywords

A. Superalloys
B. EPMA
C. High temperature corrosion

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10.1016/j.corsci.2013.05.013

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title = "Evolution of carbides and chromium depletion profiles during oxidation of Alloy 602 CA",

abstract = "The microstructure evolution in carbide strengthened Alloy 602 CA during exposure to a synthetic flue gas (N2-2.5%O2-8.6%H2O-16.4%CO2) at 1100°C has been studied. The chromium and aluminium loss resulted in a chromium depleted alloy subsurface area and the dissolution of the carbides within this area. An increase of the carbide fraction in the sample core was observed and quantified. Phase equilibria calculations revealed that the depletion of aluminium as well as that of chromium triggers carbon to leave the depleted area. The overall carbon depletion in that area corresponded to the observed increase in carbide fraction in the sample core.",

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T1 - Evolution of carbides and chromium depletion profiles during oxidation of Alloy 602 CA

AU - Pillai, R.

AU - Ackermann, H.

AU - Hattendorf, H.

AU - Richter, S.

PY - 2013/10

Y1 - 2013/10

N2 - The microstructure evolution in carbide strengthened Alloy 602 CA during exposure to a synthetic flue gas (N2-2.5%O2-8.6%H2O-16.4%CO2) at 1100°C has been studied. The chromium and aluminium loss resulted in a chromium depleted alloy subsurface area and the dissolution of the carbides within this area. An increase of the carbide fraction in the sample core was observed and quantified. Phase equilibria calculations revealed that the depletion of aluminium as well as that of chromium triggers carbon to leave the depleted area. The overall carbon depletion in that area corresponded to the observed increase in carbide fraction in the sample core.

AB - The microstructure evolution in carbide strengthened Alloy 602 CA during exposure to a synthetic flue gas (N2-2.5%O2-8.6%H2O-16.4%CO2) at 1100°C has been studied. The chromium and aluminium loss resulted in a chromium depleted alloy subsurface area and the dissolution of the carbides within this area. An increase of the carbide fraction in the sample core was observed and quantified. Phase equilibria calculations revealed that the depletion of aluminium as well as that of chromium triggers carbon to leave the depleted area. The overall carbon depletion in that area corresponded to the observed increase in carbide fraction in the sample core.

KW - A. Superalloys

KW - B. EPMA

KW - C. High temperature corrosion

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DO - 10.1016/j.corsci.2013.05.013

M3 - Article

AN - SCOPUS:84880945041

SN - 0010-938X

VL - 75

SP - 28

EP - 37

JO - Corrosion Science

JF - Corrosion Science

ER -

Evolution of carbides and chromium depletion profiles during oxidation of Alloy 602 CA

Abstract

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Keywords

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