The carburization behavior of alloy 800HT in high temperature supercritical-CO2

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The contribution of high temperature supercritical-CO2 (S-CO2) exposure (650 degrees C for 1000 h) on the carburization behavior of Alloy 800HT was studied. For comparison, Alloy 800HT specimens were also exposed to air and vacuum environments. The S-CO2 exposed specimens showed carbon-accumulated layer at the oxide-matrix interface. All specimens showed subsurface carbide precipitation but it was more pronounced for the S-CO2 exposed specimen, suggesting inward carbon diffusion from the carbon-accumulated layer at oxide-matrix interface. The pronounced subsurface carbide precipitation for the S-CO2 exposed specimens resulted in much increased hardening and reduction in ductility. Thus, we clearly identified that S-CO2 exposure caused the formation of the interfacial carbon-accumulated layer and more subsurface carbide precipitates, and resulting in additional hardening and reduction in ductility for Alloy 800HT. (C) 2021 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER
Issue Date
2021-09
Language
English
Article Type
Article
Citation

MATERIALS LETTERS, v.299, pp.130067

ISSN
0167-577X
DOI
10.1016/j.matlet.2021.130067
URI
http://hdl.handle.net/10203/286953
Appears in Collection
NE-Journal Papers(저널논문)
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