Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Título da fonte: | Biblioteca Digital de Teses e Dissertações da FEI |
Texto Completo: | https://repositorio.fei.edu.br/handle/FEI/3419 |
Resumo: | This work aims to investigate the relation between PREN of ferrite and austenite and the pitting potential of UNS S31803 DSS. Samples were solution-treated between 1040 °C and 1150 °C generating different phase fractions and, consequently, different alloy element contents. ThermoCalc® thermodynamic simulations were performed to predict the chemical composition of each phase allowing the PREN calculations. Besides, potentiodynamic polarization tests were conducted in 0.6 M NaCl solution at 70 °C to correlate pitting potential (Epit) and PREN. Thermodynamic simulation reveals that PREN for ferrite is higher than austenite between 975 °C and 1300 °C. Nevertheless, the electrochemical results show a slight reduction of pitting potential with increasing ferrite content, probably related to the reduction of Cr and Mo contents in this phase. Pits were found preferably in ferrite and in ferrite/austenite interfaces. This behavior suggests that, even with only a slight reduction of pitting potential and, consequently, a discrete corrosion resistance reduction, ferrite is more susceptible to pitting. No pits were found in austenite, suggesting that higher N contents are fundamental to maintain the corrosion resistance of this phase. |
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SANTOS, D.CMACARRAO, I. M.Rodrigo Magnabosco2021-10-28T20:36:14Z2021-10-28T20:36:14Z2019-12-12SANTOS, D.C; MACARRAO, I. M.; MAGNABOSCO, R. Relation between pitting potential and PREN values for ferrite and austenite in duplex stainless steels. BHM Berg- und Hüttenmännische Monatshefte, v. 165, n. 1, p. 46-50, 2019.1613-7531https://repositorio.fei.edu.br/handle/FEI/3419This work aims to investigate the relation between PREN of ferrite and austenite and the pitting potential of UNS S31803 DSS. Samples were solution-treated between 1040 °C and 1150 °C generating different phase fractions and, consequently, different alloy element contents. ThermoCalc® thermodynamic simulations were performed to predict the chemical composition of each phase allowing the PREN calculations. Besides, potentiodynamic polarization tests were conducted in 0.6 M NaCl solution at 70 °C to correlate pitting potential (Epit) and PREN. Thermodynamic simulation reveals that PREN for ferrite is higher than austenite between 975 °C and 1300 °C. Nevertheless, the electrochemical results show a slight reduction of pitting potential with increasing ferrite content, probably related to the reduction of Cr and Mo contents in this phase. Pits were found preferably in ferrite and in ferrite/austenite interfaces. This behavior suggests that, even with only a slight reduction of pitting potential and, consequently, a discrete corrosion resistance reduction, ferrite is more susceptible to pitting. No pits were found in austenite, suggesting that higher N contents are fundamental to maintain the corrosion resistance of this phase.1515BHM Berg- und Hüttenmännische MonatshefteduplexpittingpolarizationPRENRelation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steelsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccessreponame:Biblioteca Digital de Teses e Dissertações da FEIinstname:Centro Universitário da Fundação Educacional Inaciana (FEI)instacron:FEIhttps://link.springer.com/article/10.1007%2Fs00501-019-00925-7ORIGINALMagnabosco_pdfMagnabosco_pdfapplication/pdf1133792https://repositorio.fei.edu.br/bitstream/FEI/3419/1/Magnabosco_pdf379ee0360b7b5f5ccb4b5eaaacad2db6MD51TEXTMagnabosco_pdf.txtMagnabosco_pdf.txtExtracted texttext/plain17960https://repositorio.fei.edu.br/bitstream/FEI/3419/2/Magnabosco_pdf.txt8912bcf782e862723fb031c1facf7cd7MD52THUMBNAILMagnabosco_pdf.jpgMagnabosco_pdf.jpgGenerated Thumbnailimage/jpeg1581https://repositorio.fei.edu.br/bitstream/FEI/3419/3/Magnabosco_pdf.jpgef2ca7b0775f804220848a7e8528f6beMD53FEI/34192021-10-29 03:00:29.97Biblioteca Digital de Teses e Dissertaçõeshttp://sofia.fei.edu.br/pergamum/biblioteca/PRI |
dc.title.pt_BR.fl_str_mv |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
title |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
spellingShingle |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels SANTOS, D.C duplex pitting polarization PREN |
title_short |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
title_full |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
title_fullStr |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
title_full_unstemmed |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
title_sort |
Relation Between Pitting Potential and PREN Values for Ferrite and Austenite in Duplex Stainless Steels |
author |
SANTOS, D.C |
author_facet |
SANTOS, D.C MACARRAO, I. M. Rodrigo Magnabosco |
author_role |
author |
author2 |
MACARRAO, I. M. Rodrigo Magnabosco |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
SANTOS, D.C MACARRAO, I. M. Rodrigo Magnabosco |
dc.subject.por.fl_str_mv |
duplex pitting polarization PREN |
topic |
duplex pitting polarization PREN |
description |
This work aims to investigate the relation between PREN of ferrite and austenite and the pitting potential of UNS S31803 DSS. Samples were solution-treated between 1040 °C and 1150 °C generating different phase fractions and, consequently, different alloy element contents. ThermoCalc® thermodynamic simulations were performed to predict the chemical composition of each phase allowing the PREN calculations. Besides, potentiodynamic polarization tests were conducted in 0.6 M NaCl solution at 70 °C to correlate pitting potential (Epit) and PREN. Thermodynamic simulation reveals that PREN for ferrite is higher than austenite between 975 °C and 1300 °C. Nevertheless, the electrochemical results show a slight reduction of pitting potential with increasing ferrite content, probably related to the reduction of Cr and Mo contents in this phase. Pits were found preferably in ferrite and in ferrite/austenite interfaces. This behavior suggests that, even with only a slight reduction of pitting potential and, consequently, a discrete corrosion resistance reduction, ferrite is more susceptible to pitting. No pits were found in austenite, suggesting that higher N contents are fundamental to maintain the corrosion resistance of this phase. |
publishDate |
2019 |
dc.date.issued.fl_str_mv |
2019-12-12 |
dc.date.accessioned.fl_str_mv |
2021-10-28T20:36:14Z |
dc.date.available.fl_str_mv |
2021-10-28T20:36:14Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.citation.fl_str_mv |
SANTOS, D.C; MACARRAO, I. M.; MAGNABOSCO, R. Relation between pitting potential and PREN values for ferrite and austenite in duplex stainless steels. BHM Berg- und Hüttenmännische Monatshefte, v. 165, n. 1, p. 46-50, 2019. |
dc.identifier.uri.fl_str_mv |
https://repositorio.fei.edu.br/handle/FEI/3419 |
dc.identifier.issn.none.fl_str_mv |
1613-7531 |
identifier_str_mv |
SANTOS, D.C; MACARRAO, I. M.; MAGNABOSCO, R. Relation between pitting potential and PREN values for ferrite and austenite in duplex stainless steels. BHM Berg- und Hüttenmännische Monatshefte, v. 165, n. 1, p. 46-50, 2019. 1613-7531 |
url |
https://repositorio.fei.edu.br/handle/FEI/3419 |
dc.relation.ispartof.none.fl_str_mv |
BHM Berg- und Hüttenmännische Monatshefte |
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info:eu-repo/semantics/openAccess |
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openAccess |
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Centro Universitário da Fundação Educacional Inaciana (FEI) |
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FEI |
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Biblioteca Digital de Teses e Dissertações da FEI |
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Biblioteca Digital de Teses e Dissertações da FEI |
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