Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR
This work analyzed the volume fraction of the sigma phase in a superduplex stainless steel UNS S32760. Two electrochemical testing methodologies were applied for this purpose. Firstly the DL-EPR test was performed in three different electrolytic solutions. The LSV-KOH test was also used, a recent me...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423022317 |
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| author | Marcelo T.G. de Sampaio Anderson B. Furtado Marcelo D.C. Ignácio Sérgio S.M. Tavares Juan M. Pardal André R. Pimenta Javier A.C. Velasco Eduardo A. Ponzio |
| author_facet | Marcelo T.G. de Sampaio Anderson B. Furtado Marcelo D.C. Ignácio Sérgio S.M. Tavares Juan M. Pardal André R. Pimenta Javier A.C. Velasco Eduardo A. Ponzio |
| author_sort | Marcelo T.G. de Sampaio |
| collection | DOAJ |
| description | This work analyzed the volume fraction of the sigma phase in a superduplex stainless steel UNS S32760. Two electrochemical testing methodologies were applied for this purpose. Firstly the DL-EPR test was performed in three different electrolytic solutions. The LSV-KOH test was also used, a recent methodology proposal for analyzing these alloys. Seven specimens were solution annealed at 1100 °C for 60 min and heat-treated at 850 and 950 °C for 5, 20, and 60 min to promote the formation of different fractions of the sigma phase. The sigma phase volume fraction present in these specimens was determined by quantitative metallography. The DL-EPR analyses in all three conditions proved to be limited in quantifying the sigma phase, especially in specimens heat-treated at 950 °C. On the other hand, from the analyses with the LSV-KOH technique, it was possible to construct a reference curve between the sigma volume fractions and the electrochemical response of the LSV-KOH test (charge density), obtaining a linear regression coefficient of 0.97. This curve can then be applied to quantify the sigma phase. For comparison, the best regression coefficient obtained for DL-EPR was 0.53. Accompanied by the quantitative analysis, a qualitative analysis of the sigma phase can be made from a deeper analysis of the LSV-KOH voltammograms. In these analyses, it was possible to infer whether the sigma phase morphology is lamellar or in blocks. From the results obtained, it was possible to show that the LSV-KOH test is more precise in quantifying the sigma phase and allows a morphological analysis. |
| first_indexed | 2024-03-11T15:05:10Z |
| format | Article |
| id | doaj.art-d27eadd21d58468eb18ff60ae00f9d3c |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-11T15:05:10Z |
| publishDate | 2023-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-d27eadd21d58468eb18ff60ae00f9d3c2023-10-30T06:04:37ZengElsevierJournal of Materials Research and Technology2238-78542023-09-012681498164Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPRMarcelo T.G. de Sampaio0Anderson B. Furtado1Marcelo D.C. Ignácio2Sérgio S.M. Tavares3Juan M. Pardal4André R. Pimenta5Javier A.C. Velasco6Eduardo A. Ponzio7Laboratório de Materiais da UFF (G2E/LaMUFF), Instituto de Química, Universidade Federal Fluminense – UFF, Rua Outeiro de São João Batista, s/n, CEP 24020-141, Niterói, RJ, BrazilLaboratório de Materiais da UFF (G2E/LaMUFF), Instituto de Química, Universidade Federal Fluminense – UFF, Rua Outeiro de São João Batista, s/n, CEP 24020-141, Niterói, RJ, BrazilLaboratório de Materiais da UFF (G2E/LaMUFF), Instituto de Química, Universidade Federal Fluminense – UFF, Rua Outeiro de São João Batista, s/n, CEP 24020-141, Niterói, RJ, BrazilPrograma de Pós-Graduação em Engenharia Mecânica e Montagem Industrial, Escola de Engenharia, Universidade Federal Fluminense – UFF, Rua Passo da Pátria, 156, CEP 24210-240, Niterói, RJ, BrazilPrograma de Pós-Graduação em Engenharia Mecânica e Montagem Industrial, Escola de Engenharia, Universidade Federal Fluminense – UFF, Rua Passo da Pátria, 156, CEP 24210-240, Niterói, RJ, BrazilPrograma de Pós-Graduação em Engenharia Mecânica e Montagem Industrial, Escola de Engenharia, Universidade Federal Fluminense – UFF, Rua Passo da Pátria, 156, CEP 24210-240, Niterói, RJ, Brazil; Laboratório de Instrumentação e Simulação Computacional LISCOMP, Campus Paracambi, Instituto Federal do Rio de Janeiro, Rua Sebastião Lacerda, s/n, CEP 26600-000, Paracambi, RJ, BrazilLaboratório de H2S, CO2 e Corrosividade (LAH2S) - Instituto Nacional de Tecnologia (INT) – Rio de Janeiro – RJ, BrazilLaboratório de Materiais da UFF (G2E/LaMUFF), Instituto de Química, Universidade Federal Fluminense – UFF, Rua Outeiro de São João Batista, s/n, CEP 24020-141, Niterói, RJ, Brazil; Corresponding author.This work analyzed the volume fraction of the sigma phase in a superduplex stainless steel UNS S32760. Two electrochemical testing methodologies were applied for this purpose. Firstly the DL-EPR test was performed in three different electrolytic solutions. The LSV-KOH test was also used, a recent methodology proposal for analyzing these alloys. Seven specimens were solution annealed at 1100 °C for 60 min and heat-treated at 850 and 950 °C for 5, 20, and 60 min to promote the formation of different fractions of the sigma phase. The sigma phase volume fraction present in these specimens was determined by quantitative metallography. The DL-EPR analyses in all three conditions proved to be limited in quantifying the sigma phase, especially in specimens heat-treated at 950 °C. On the other hand, from the analyses with the LSV-KOH technique, it was possible to construct a reference curve between the sigma volume fractions and the electrochemical response of the LSV-KOH test (charge density), obtaining a linear regression coefficient of 0.97. This curve can then be applied to quantify the sigma phase. For comparison, the best regression coefficient obtained for DL-EPR was 0.53. Accompanied by the quantitative analysis, a qualitative analysis of the sigma phase can be made from a deeper analysis of the LSV-KOH voltammograms. In these analyses, it was possible to infer whether the sigma phase morphology is lamellar or in blocks. From the results obtained, it was possible to show that the LSV-KOH test is more precise in quantifying the sigma phase and allows a morphological analysis.http://www.sciencedirect.com/science/article/pii/S2238785423022317Superduplex stainless steelSigma phaseMorphologySigma phase electrochemical quantificationLinear sweep voltammetry |
| spellingShingle | Marcelo T.G. de Sampaio Anderson B. Furtado Marcelo D.C. Ignácio Sérgio S.M. Tavares Juan M. Pardal André R. Pimenta Javier A.C. Velasco Eduardo A. Ponzio Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR Journal of Materials Research and Technology Superduplex stainless steel Sigma phase Morphology Sigma phase electrochemical quantification Linear sweep voltammetry |
| title | Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR |
| title_full | Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR |
| title_fullStr | Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR |
| title_full_unstemmed | Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR |
| title_short | Electrochemical characterization of sigma phase in superduplex stainless steels: LSV-KOH as a promising methodology over DL-EPR |
| title_sort | electrochemical characterization of sigma phase in superduplex stainless steels lsv koh as a promising methodology over dl epr |
| topic | Superduplex stainless steel Sigma phase Morphology Sigma phase electrochemical quantification Linear sweep voltammetry |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423022317 |
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