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51313-02646-Cyclic Oxidation Behavior and Durability of ODS-FeCrAl Alloys in H2O and CO2 Rich Environments

Picture for Cyclic Oxidation Behavior and Durability of ODS-FeCrAl Alloys in H2O and CO2 Rich Environments
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Product Number: 51313-02646-SG
ISBN: 02646 2013 CP
Author: Sebastien Dryepondt
Publication Date: 2013
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Oxide Dispersion Strengthened FeCrAl alloys exhibit excellent creep and oxidation resistance up to 1200ºC and are therefore of interest for high temperature fossil processes such as high temperature heat exchanger. The nano dispersion of oxide particles in the alloy results in the existence at a given temperature of a stress threshold below which creep deformation is negligible. For this reason the lifetime of a well designed component is expected to depend mostly on the alloy corrosion resistance. Cyclic oxidation testing was conducted at 1100ºC and 1200ºC in air and atmospheres rich in H2O and/or CO2 to simulate combustion environments. H2O was found to have no effect on the alumina scale growth at 1100ºC but accelerated the scale spallation at 1200ºC. Exposure at 1100ºC in a mixture of 50%H2O/50%CO2 increased also spallation compared with the same exposure in air but this effect on scale adhesion nearly disappeared when 0.75ppm of O2 was added to the 50%H2O/50%CO2 mixture. Oxidation-based models for lifetime prediction will be presented and the effect of H2O and CO2 on ODS component durability will be discussed.


_________________________
Research sponsored by the U. S. Department of Energy Office of Fossil Energy

Oxide Dispersion Strengthened FeCrAl alloys exhibit excellent creep and oxidation resistance up to 1200ºC and are therefore of interest for high temperature fossil processes such as high temperature heat exchanger. The nano dispersion of oxide particles in the alloy results in the existence at a given temperature of a stress threshold below which creep deformation is negligible. For this reason the lifetime of a well designed component is expected to depend mostly on the alloy corrosion resistance. Cyclic oxidation testing was conducted at 1100ºC and 1200ºC in air and atmospheres rich in H2O and/or CO2 to simulate combustion environments. H2O was found to have no effect on the alumina scale growth at 1100ºC but accelerated the scale spallation at 1200ºC. Exposure at 1100ºC in a mixture of 50%H2O/50%CO2 increased also spallation compared with the same exposure in air but this effect on scale adhesion nearly disappeared when 0.75ppm of O2 was added to the 50%H2O/50%CO2 mixture. Oxidation-based models for lifetime prediction will be presented and the effect of H2O and CO2 on ODS component durability will be discussed.


_________________________
Research sponsored by the U. S. Department of Energy Office of Fossil Energy

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