Effect of surface modification on the corrosion resistance of austenitic stainless steel 316L in supercritical water conditions

Sami Penttilä (Corresponding Author), Aki Toivonen, J. Li, W. Zheng, R. Novotny

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

This work summarizes the results of corrosion studies of a surface treated austenitic stainless steel 316L at relevant operating conditions of SCWR (Supercritical Water Reactor). Different surface treatments were conducted for austenitic stainless steel 316L tube samples in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water (SCW) at 650 °C/25 MPa, up to 3000 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations using a Scanning Electron Microscope (SEM) in conjunction with Energy Dispersive X-ray Spectroscopy (EDS). Additional investigations using a Focused Ion Beam (FIB) microscope and a Transmission Electron Microscopy (TEM) were also performed on selected samples. It is observed that in machined sample, with a fine-grained microstructure and higher dislocation density in the sub-surface zone formed a very thin Cr-rich oxide film which suppresses the inward oxygen and outward iron diffusion.
Original languageEnglish
Pages (from-to)157-163
Number of pages6
JournalJournal of Supercritical Fluids
Volume81
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

Fingerprint

austenitic stainless steels
Austenitic stainless steel
corrosion resistance
Corrosion resistance
Surface treatment
Water
water
Focused ion beams
Corrosion rate
Oxide films
Energy dispersive spectroscopy
corrosion
Microscopes
Electron microscopes
Iron
Corrosion
Oxygen
Transmission electron microscopy
Scanning
Microstructure

Keywords

  • austenitic stainless steel oxidation
  • supercritical water
  • surface modification

Cite this

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abstract = "This work summarizes the results of corrosion studies of a surface treated austenitic stainless steel 316L at relevant operating conditions of SCWR (Supercritical Water Reactor). Different surface treatments were conducted for austenitic stainless steel 316L tube samples in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water (SCW) at 650 °C/25 MPa, up to 3000 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations using a Scanning Electron Microscope (SEM) in conjunction with Energy Dispersive X-ray Spectroscopy (EDS). Additional investigations using a Focused Ion Beam (FIB) microscope and a Transmission Electron Microscopy (TEM) were also performed on selected samples. It is observed that in machined sample, with a fine-grained microstructure and higher dislocation density in the sub-surface zone formed a very thin Cr-rich oxide film which suppresses the inward oxygen and outward iron diffusion.",
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author = "Sami Penttil{\"a} and Aki Toivonen and J. Li and W. Zheng and R. Novotny",
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pages = "157--163",
journal = "Journal of Supercritical Fluids",
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Effect of surface modification on the corrosion resistance of austenitic stainless steel 316L in supercritical water conditions. / Penttilä, Sami (Corresponding Author); Toivonen, Aki; Li, J.; Zheng, W.; Novotny, R.

In: Journal of Supercritical Fluids, Vol. 81, 2013, p. 157-163.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Effect of surface modification on the corrosion resistance of austenitic stainless steel 316L in supercritical water conditions

AU - Penttilä, Sami

AU - Toivonen, Aki

AU - Li, J.

AU - Zheng, W.

AU - Novotny, R.

PY - 2013

Y1 - 2013

N2 - This work summarizes the results of corrosion studies of a surface treated austenitic stainless steel 316L at relevant operating conditions of SCWR (Supercritical Water Reactor). Different surface treatments were conducted for austenitic stainless steel 316L tube samples in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water (SCW) at 650 °C/25 MPa, up to 3000 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations using a Scanning Electron Microscope (SEM) in conjunction with Energy Dispersive X-ray Spectroscopy (EDS). Additional investigations using a Focused Ion Beam (FIB) microscope and a Transmission Electron Microscopy (TEM) were also performed on selected samples. It is observed that in machined sample, with a fine-grained microstructure and higher dislocation density in the sub-surface zone formed a very thin Cr-rich oxide film which suppresses the inward oxygen and outward iron diffusion.

AB - This work summarizes the results of corrosion studies of a surface treated austenitic stainless steel 316L at relevant operating conditions of SCWR (Supercritical Water Reactor). Different surface treatments were conducted for austenitic stainless steel 316L tube samples in order to study the effect of cold work in sample surface on corrosion resistance. Samples were exposed in supercritical water (SCW) at 650 °C/25 MPa, up to 3000 h. The corrosion rate was evaluated by measuring the weight change of the samples and by cross-section examinations using a Scanning Electron Microscope (SEM) in conjunction with Energy Dispersive X-ray Spectroscopy (EDS). Additional investigations using a Focused Ion Beam (FIB) microscope and a Transmission Electron Microscopy (TEM) were also performed on selected samples. It is observed that in machined sample, with a fine-grained microstructure and higher dislocation density in the sub-surface zone formed a very thin Cr-rich oxide film which suppresses the inward oxygen and outward iron diffusion.

KW - austenitic stainless steel oxidation

KW - supercritical water

KW - surface modification

U2 - 10.1016/j.supflu.2013.05.002

DO - 10.1016/j.supflu.2013.05.002

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EP - 163

JO - Journal of Supercritical Fluids

JF - Journal of Supercritical Fluids

SN - 0896-8446

ER -