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

A steam oxidation test was conducted at 267 ± 17 bar and 670°C for 293 hr. 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.
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0030-770X
Resource Type:
Journal Article
Resource Relation:
Journal Name: Oxidation of Metals; Journal Volume: 82; Journal Issue: 3-4
Research Org:
National Energy Technology Laboratory - In-house Research
Sponsoring Org:
USDOE Office of Fossil Energy (FE)
Country of Publication:
United States
Steam, Oxidation, Superalloy, Pressure, Advanced Ultra-supercritical