The reactive element effect in commercial ODS fecrai alloys

B. A. Pint; A. J. Garratt-Reed; L. W. Hobbs

doi:10.1080/09603409.1995.11689496

The reactive element effect in commercial ODS fecrai alloys

B. A. Pint, A. J. Garratt-Reed, L. W. Hobbs

Research output: Contribution to journal › Article › peer-review

203 Scopus citations

Abstract

Two commercial oxide dispersion strengthened alumina-forming FeCrAl alloys, Inco alloy MA956 and Kanthal alloy APM, were studied in order to look at the effect of reactive elements on their oxidation behaviour. MA956 has a distribution of Y₂O₃−Al₂O₃ particles, while APM has a ZrO₂—AI₂O₃ distribution. Isothermal oxidation at 1000°C and 1200°C showed a reduced oxidation rate for both alloys compared to that of an undoped FeCrAl alloy. In short-term cyclic tests at 1200°C, both alloys exhibited excellent scale adhesion. Using scanning transmission electron microscopy with X-ray energy dispersive spectroscopy, both Y and Zr, respectively, were found to segregate to the oxide grain boundaries and the metal-scale interface after oxidation at 1000°C and 1200°C. These experimental observations are discussed with regard to a new theory to explain the reactive element effect.

Original language	English
Pages (from-to)	3-16
Number of pages	14
Journal	Materials at High Temperatures
Volume	13
Issue number	1
DOIs	https://doi.org/10.1080/09603409.1995.11689496
State	Published - Jan 1 1995
Externally published	Yes

Funding

The authors are very grateful to W. Gao at MIT, W. Lipscomb at Inco and B. Jonsson at Kanthal for providing materials; and to J. Adario for his assistance with the GAXRD work, G. Arndt and R. Perilli for assistance with the oxidation equipment and P. Tortorelli at ORNL for reviewing the manuscript. The Timken Company and the Electric Power Research Institute provided financial support for this research.

Funders	Funder number
Timken Company
Electric Power Research Institute

Keywords

Inco MA956
Kanthal APM
Reactive element effect

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10.1080/09603409.1995.11689496

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abstract = "Two commercial oxide dispersion strengthened alumina-forming FeCrAl alloys, Inco alloy MA956 and Kanthal alloy APM, were studied in order to look at the effect of reactive elements on their oxidation behaviour. MA956 has a distribution of Y2O3−Al2O3 particles, while APM has a ZrO2—AI2O3 distribution. Isothermal oxidation at 1000°C and 1200°C showed a reduced oxidation rate for both alloys compared to that of an undoped FeCrAl alloy. In short-term cyclic tests at 1200°C, both alloys exhibited excellent scale adhesion. Using scanning transmission electron microscopy with X-ray energy dispersive spectroscopy, both Y and Zr, respectively, were found to segregate to the oxide grain boundaries and the metal-scale interface after oxidation at 1000°C and 1200°C. These experimental observations are discussed with regard to a new theory to explain the reactive element effect.",

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N2 - Two commercial oxide dispersion strengthened alumina-forming FeCrAl alloys, Inco alloy MA956 and Kanthal alloy APM, were studied in order to look at the effect of reactive elements on their oxidation behaviour. MA956 has a distribution of Y2O3−Al2O3 particles, while APM has a ZrO2—AI2O3 distribution. Isothermal oxidation at 1000°C and 1200°C showed a reduced oxidation rate for both alloys compared to that of an undoped FeCrAl alloy. In short-term cyclic tests at 1200°C, both alloys exhibited excellent scale adhesion. Using scanning transmission electron microscopy with X-ray energy dispersive spectroscopy, both Y and Zr, respectively, were found to segregate to the oxide grain boundaries and the metal-scale interface after oxidation at 1000°C and 1200°C. These experimental observations are discussed with regard to a new theory to explain the reactive element effect.

AB - Two commercial oxide dispersion strengthened alumina-forming FeCrAl alloys, Inco alloy MA956 and Kanthal alloy APM, were studied in order to look at the effect of reactive elements on their oxidation behaviour. MA956 has a distribution of Y2O3−Al2O3 particles, while APM has a ZrO2—AI2O3 distribution. Isothermal oxidation at 1000°C and 1200°C showed a reduced oxidation rate for both alloys compared to that of an undoped FeCrAl alloy. In short-term cyclic tests at 1200°C, both alloys exhibited excellent scale adhesion. Using scanning transmission electron microscopy with X-ray energy dispersive spectroscopy, both Y and Zr, respectively, were found to segregate to the oxide grain boundaries and the metal-scale interface after oxidation at 1000°C and 1200°C. These experimental observations are discussed with regard to a new theory to explain the reactive element effect.

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The reactive element effect in commercial ODS fecrai alloys

Abstract

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