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High Pressure Steam Oxidation of Alloys for Advanced Ultra-Supercritical Conditions

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Abstract

A steam oxidation test was conducted at 267 ± 17 bar and 670 °C for 293 h. A comparison test was run at 1 bar. All of the alloys showed an increase in scale thickness and oxidation rate with pressure, and TP304H and IN625 had very large increases. Fine-grained TP304H at 267 bar behaved like a coarse grained alloy, indicative of high pressure increasing the critical Cr level needed to form and maintain a chromia scale. At 267 bar H230, H263, H282, IN617 and IN740 had kp values a factor of one–to-two orders of magnitude higher than at 1 bar. IN625 had a four order of magnitude increase in kp at 267 bar compared to 1 bar. Possible causes for increased oxidation rates with increased pressure were examined, including increased solid state diffusion within the oxide scale and increased critical Cr content to establish and maintain a chromia scale.

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Acknowledgments

This work was funded by the U.S. DOE Cross-cutting Technologies program at the National Energy Technology Laboratory. This report was prepared as an account of work sponsored by the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

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    Gordon R. Holcomb

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Correspondence to Gordon R. Holcomb.

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Holcomb, G.R. High Pressure Steam Oxidation of Alloys for Advanced Ultra-Supercritical Conditions. Oxid Met 82, 271–295 (2014). https://doi.org/10.1007/s11085-014-9491-6

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