High Cr ODS steels performance under supercritical water environment

R. Novotny (Corresponding Author), P. Janik, Sami Penttilä, P. Hähner, J. Macak, J. Siegl, P. Hausild

Research output: Contribution to journalArticleScientificpeer-review

24 Citations (Scopus)

Abstract

This paper summarizes the results of supercritical water corrosion studies of two ferritic oxide dispersion strengthen (ODS) steels MA956 and PM2000 at the temperature of the upper limit of potential peak cladding temperature under normal operation, according to the conceptual design being developed in the EU. As the high temperature and pressure above the thermodynamic critical point of water result in higher oxidation rate for conventional austenitic alloys than observed in sub-critical light water reactor (LWR) conditions, ensuring adequate corrosion resistance is critical for thin-wall components like fuel cladding. This study concentrated on the investigation of two effects, surface finish and orientation of the cuts. Two different surface treated coupons were prepared in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water at 650 °C and 25 MPa, for up to 1800 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations. The microstructure of the oxide layers was analyzed using a scanning electron microscope (SEM) in conjunction with energy dispersive spectroscopy (EDS) and X-ray diffraction analysis (XRD). Weight gain results of both ODS steels proved a good resistance to general corrosion. Nevertheless the cross-sectional SEM study showed signs of nodular corrosion, observed mostly on the ground specimens after long exposure times.
Original languageEnglish
Pages (from-to)147-156
Number of pages10
JournalJournal of Supercritical Fluids
Volume81
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

Steel
Oxides
corrosion
steels
Corrosion
oxides
Corrosion resistance
Water
Electron microscopes
corrosion resistance
water
Scanning
Light water reactors
electron microscopes
light water reactors
Conceptual design
Corrosion rate
thin walls
Temperature
X ray diffraction analysis

Keywords

  • EDS
  • general corrosion
  • ODS steel
  • SEM
  • supercritical water
  • surface finish

Cite this

Novotny, R. ; Janik, P. ; Penttilä, Sami ; Hähner, P. ; Macak, J. ; Siegl, J. ; Hausild, P. / High Cr ODS steels performance under supercritical water environment. In: Journal of Supercritical Fluids. 2013 ; Vol. 81. pp. 147-156.
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High Cr ODS steels performance under supercritical water environment. / Novotny, R. (Corresponding Author); Janik, P.; Penttilä, Sami; Hähner, P.; Macak, J.; Siegl, J.; Hausild, P.

In: Journal of Supercritical Fluids, Vol. 81, 2013, p. 147-156.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Novotny, R.

AU - Janik, P.

AU - Penttilä, Sami

AU - Hähner, P.

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AU - Siegl, J.

AU - Hausild, P.

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AB - This paper summarizes the results of supercritical water corrosion studies of two ferritic oxide dispersion strengthen (ODS) steels MA956 and PM2000 at the temperature of the upper limit of potential peak cladding temperature under normal operation, according to the conceptual design being developed in the EU. As the high temperature and pressure above the thermodynamic critical point of water result in higher oxidation rate for conventional austenitic alloys than observed in sub-critical light water reactor (LWR) conditions, ensuring adequate corrosion resistance is critical for thin-wall components like fuel cladding. This study concentrated on the investigation of two effects, surface finish and orientation of the cuts. Two different surface treated coupons were prepared in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water at 650 °C and 25 MPa, for up to 1800 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations. The microstructure of the oxide layers was analyzed using a scanning electron microscope (SEM) in conjunction with energy dispersive spectroscopy (EDS) and X-ray diffraction analysis (XRD). Weight gain results of both ODS steels proved a good resistance to general corrosion. Nevertheless the cross-sectional SEM study showed signs of nodular corrosion, observed mostly on the ground specimens after long exposure times.

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