Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c

Nick Tepylo, Xiao Huang, Shengli Jiang, Sami Penttilä

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.
Original languageEnglish
Article number011014
JournalJournal of Nuclear Engineering and Radiation Science
Volume5
Issue number1
DOIs
Publication statusPublished - 2019
MoE publication typeNot Eligible

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cementation
stainless steels
Stainless steel
water
Water
materials selection
spallation
hematite
spinel
Hematite
x rays
aluminum oxides
electron microscopes
reactors
X ray diffraction analysis
coatings
Electron microscopes
scanning
Alumina
oxides

Cite this

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title = "Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c",
abstract = "The choice of materials is of great concern in the construction of Gen IV supercritical water reactors (SCWR), particularly the fuel cladding, due to the harsh environment of elevated temperatures and pressures. A material's performance under simulated conditions must be evaluated to support proper material selection by designers. In this study, aluminide and Cr-modified aluminide coated 304, as well as bare stainless steel 304 as a reference material, were tested in SCW at 700 °C and 25 MPa for 1000 hours. The results showed that all three samples experienced weight loss. However, the aluminide coated 304 had 20 to 40 times less weight loss compared to CrAl coated and bare stainless steel 304 specimens, respectively. Based on Scanning Electron Microscope / Energy Dispersive X-ray Spectroscopy (SEM/EDS) and X-ray Diffraction (XRD) analysis results, spinel and hematite Fe2O3 formed on bare 304 after 1000 hours in SCW while alumina was observed on both coated specimens, i.e. aluminide and Cr-modified aluminide surfaces. Oxide spallation was observed on the bare 304 and Cr-modified aluminide surface, contributing to a larger weight loss. Based on the results from this study, pure aluminide coating demonstrated superior performance than bare 304 and Cr-modified aluminide coated 304.",
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Performance of aluminide and cr-modified aluminide pack cementation-coated stainless steel 304 in supercritical water at 700 °c. / Tepylo, Nick; Huang, Xiao; Jiang, Shengli; Penttilä, Sami.

In: Journal of Nuclear Engineering and Radiation Science, Vol. 5, No. 1, 011014, 2019.

Research output: Contribution to journalArticleScientificpeer-review

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