In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water

Yoichi Takeda, Tetsuo Shoji, Martin Bojinov (Corresponding Author), Petri Kinnunen, Timo Saario

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.
Original languageEnglish
Pages (from-to)8580-8588
Number of pages9
JournalApplied Surface Science
Volume252
Issue number24
DOIs
Publication statusPublished - 2006
MoE publication typeA1 Journal article-refereed

Fingerprint

Stainless Steel
Oxide films
Stainless steel
Water
Electric resistance measurement
Temperature
Strain rate
Electric properties
Boiling water reactors
Electron spectroscopy
Chemical analysis
Coolants
Oxides
Vacancies
Corrosion
Cracks
Defects
Scanning electron microscopy

Keywords

  • stainless steel
  • simulated nuclear reactor coolant
  • contact electric resistance
  • slow strain rate test
  • oxide film
  • kinetic model

Cite this

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title = "In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water",
abstract = "A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.",
keywords = "stainless steel, simulated nuclear reactor coolant, contact electric resistance, slow strain rate test, oxide film, kinetic model",
author = "Yoichi Takeda and Tetsuo Shoji and Martin Bojinov and Petri Kinnunen and Timo Saario",
note = "Project code: G5SU01038",
year = "2006",
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pages = "8580--8588",
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In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water. / Takeda, Yoichi; Shoji, Tetsuo; Bojinov, Martin (Corresponding Author); Kinnunen, Petri; Saario, Timo.

In: Applied Surface Science, Vol. 252, No. 24, 2006, p. 8580-8588.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - In situ and ex situ characterisation of oxide films formed on strained stainless steel surfaces in high-temperature water

AU - Takeda, Yoichi

AU - Shoji, Tetsuo

AU - Bojinov, Martin

AU - Kinnunen, Petri

AU - Saario, Timo

N1 - Project code: G5SU01038

PY - 2006

Y1 - 2006

N2 - A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.

AB - A possible approach in describing the role of the environment in the phenomena behind initiation and propagation of a stress corrosion crack is to assume that the transport of matter and charge through the oxide film on the material is one of the rate-controlling factors. Straining of the bulk material may affect the transport rates of ionic defects, such as vacancies and interstitials, through the oxide film. The aim of the present work has been to verify the applicability of combined slow strain rate tests (SSRT) and contact electric resistance (CER) measurements to assess the influence of strain on the electric properties of oxide films on AISI 316L stainless steel with or without prior cold work in simulated boiling water reactor (BWR) coolant conditions. The SSRT-CER measurements have been combined with ex situ characterisation of the oxide films after experiments using electron spectroscopy for chemical analysis (ESCA) and scanning electron microscopy (SEM). The results suggest that the effect of strain on the resistance of the oxide films seems to correlate with the effect of the same parameter on the Cr(III) concentration in the inner layer of the oxide. In addition, important differences between the concentration of Ni and Fe in the outer layer formed on stressed and unstressed surface have been observed. Based on the mixed-conduction model for oxide films, an attempt is made to evaluate the effect of straining on the electric properties of the oxide films and to correlate these effects with the changes in film composition and structure.

KW - stainless steel

KW - simulated nuclear reactor coolant

KW - contact electric resistance

KW - slow strain rate test

KW - oxide film

KW - kinetic model

U2 - 10.1016/j.apsusc.2005.11.073

DO - 10.1016/j.apsusc.2005.11.073

M3 - Article

VL - 252

SP - 8580

EP - 8588

JO - Applied Surface Science

JF - Applied Surface Science

SN - 0169-4332

IS - 24

ER -