Stress corrosion cracking susceptibility of austenitic stainless steels in supercritical water conditions

R. Novotny (Corresponding Author), P. Hähner, J. Siegl, P. Hausild, S. Ripplinger, Sami Penttilä, Aki Toivonen

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

The presented paper summarizes the results of general corrosion and stress corrosion cracking (SCC) susceptibility tests in supercritical water (SCW), studied for austenitic stainless steel 316L, with the aim to identify maximum SCW temperature usability and specific failure mechanisms prevailing during slow strain-rate tensile (SSRT) tests in ultra-pure demineralized SCW solution with controlled oxygen content. The general corrosion tests clearly revealed the applicability of austenitic stainless steel in SCW to be limited to 550 °C as maximum temperature as oxidation rates of austenitic stainless steels 316L increase dramatically above 550 °C. The SSRT tests were performed using a step-motor controlled loading device in an autoclave at 550 °C SCW. Besides the strain rate (resp. crosshead speed), the oxygen content was varied in the series of tests. The obtained results showed that even at the lowest strain rate, a serious increase of SCC susceptibility, as typically characterized by IGSCC crack growth, was not observed. The fractography confirmed that failure was due to a combination of transgranular SCC and transgranular ductile fracture. Based on fractographic findings a phenomenological map describing the SCC regime of SSRT test parameters could be proposed for AISI 316L.
Original languageEnglish
Pages (from-to)117-123
Number of pages7
JournalJournal of Nuclear Materials
Volume409
Issue number2
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed
EventIAEA-EC Topical Meeting on Development of New Structural Materials for Advanced Fission and Fusion Reactor Materials, TR-37435 - Barcelona, Spain
Duration: 5 Oct 20099 Oct 2009

Fingerprint

stress corrosion cracking
austenitic stainless steels
Stress corrosion cracking
Austenitic stainless steel
strain rate
Strain rate
magnetic permeability
tensile tests
Water
water
transgranular corrosion
corrosion
Corrosion
fractography
Oxygen
corrosion tests
Fractography
Stepping motors
autoclaves
water temperature

Keywords

  • SCW
  • Corrosion
  • SCC
  • SSRT
  • general corrosion

Cite this

Novotny, R. ; Hähner, P. ; Siegl, J. ; Hausild, P. ; Ripplinger, S. ; Penttilä, Sami ; Toivonen, Aki. / Stress corrosion cracking susceptibility of austenitic stainless steels in supercritical water conditions. In: Journal of Nuclear Materials. 2010 ; Vol. 409, No. 2. pp. 117-123.
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abstract = "The presented paper summarizes the results of general corrosion and stress corrosion cracking (SCC) susceptibility tests in supercritical water (SCW), studied for austenitic stainless steel 316L, with the aim to identify maximum SCW temperature usability and specific failure mechanisms prevailing during slow strain-rate tensile (SSRT) tests in ultra-pure demineralized SCW solution with controlled oxygen content. The general corrosion tests clearly revealed the applicability of austenitic stainless steel in SCW to be limited to 550 °C as maximum temperature as oxidation rates of austenitic stainless steels 316L increase dramatically above 550 °C. The SSRT tests were performed using a step-motor controlled loading device in an autoclave at 550 °C SCW. Besides the strain rate (resp. crosshead speed), the oxygen content was varied in the series of tests. The obtained results showed that even at the lowest strain rate, a serious increase of SCC susceptibility, as typically characterized by IGSCC crack growth, was not observed. The fractography confirmed that failure was due to a combination of transgranular SCC and transgranular ductile fracture. Based on fractographic findings a phenomenological map describing the SCC regime of SSRT test parameters could be proposed for AISI 316L.",
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Stress corrosion cracking susceptibility of austenitic stainless steels in supercritical water conditions. / Novotny, R. (Corresponding Author); Hähner, P.; Siegl, J.; Hausild, P.; Ripplinger, S.; Penttilä, Sami; Toivonen, Aki.

In: Journal of Nuclear Materials, Vol. 409, No. 2, 2010, p. 117-123.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Stress corrosion cracking susceptibility of austenitic stainless steels in supercritical water conditions

AU - Novotny, R.

AU - Hähner, P.

AU - Siegl, J.

AU - Hausild, P.

AU - Ripplinger, S.

AU - Penttilä, Sami

AU - Toivonen, Aki

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AB - The presented paper summarizes the results of general corrosion and stress corrosion cracking (SCC) susceptibility tests in supercritical water (SCW), studied for austenitic stainless steel 316L, with the aim to identify maximum SCW temperature usability and specific failure mechanisms prevailing during slow strain-rate tensile (SSRT) tests in ultra-pure demineralized SCW solution with controlled oxygen content. The general corrosion tests clearly revealed the applicability of austenitic stainless steel in SCW to be limited to 550 °C as maximum temperature as oxidation rates of austenitic stainless steels 316L increase dramatically above 550 °C. The SSRT tests were performed using a step-motor controlled loading device in an autoclave at 550 °C SCW. Besides the strain rate (resp. crosshead speed), the oxygen content was varied in the series of tests. The obtained results showed that even at the lowest strain rate, a serious increase of SCC susceptibility, as typically characterized by IGSCC crack growth, was not observed. The fractography confirmed that failure was due to a combination of transgranular SCC and transgranular ductile fracture. Based on fractographic findings a phenomenological map describing the SCC regime of SSRT test parameters could be proposed for AISI 316L.

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