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Sensitization Behavior of Type 409 Ferritic Stainless Steel: Confronting DL-EPR Test and Practice W of ASTM A763

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Abstract

Stainless steels employed for manufacturing automotive exhaust systems must withstand severe thermal cycles, corrosive environment due to urea decomposition, and welding operations. AISI 409 ferritic stainless steel can be considered a low-cost alternative for this application. However, depending on the manufacturing conditions during welding cycles, this material can be sensitized due to the precipitation of chromium carbides at grain boundaries. In this work, the intergranular corrosion resistances of the AISI 409 ferritic stainless steel were evaluated after annealing at 300, 500, and 700 °C for 2, 4, and 6 h. Solution-annealed samples were also tested for comparison purposes. Two methodologies were used to assess the sensitization behavior of the 409 stainless steel samples: the first one was based on the ASTM A763 (practice W), while the second one was based on the double-loop electrochemical potentiodynamic reactivation test. It was possible to identify that the annealing treatment performed at 500 °C was more critical to the occurrence of intergranular corrosion.

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Acknowledgments

The authors are grateful to Suprens (Brazil) for the kind gesture in providing the AISI 409 sheet used in this work.

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Authors and Affiliations

  1. Centro de Engenharia, Modelagem e Ciências Sociais Aplicadas (CECS), Universidade Federal do ABC (UFABC), Santo André, SP, 09210-580, Brazil

    Taís Campos Scalise & Renato Altobelli Antunes

  2. Centro de Inovação, Empreendedorismo e Tecnologia (CIETEC), Electrocell Ind. Com. Equip. Elet. LTDA, São Paulo, SP, 05508-000, Brazil

    Mara Cristina Lopes de Oliveira

  3. Instituto de Geociências, Universidade de São Paulo, Rua do Lago, 562, São Paulo, SP, 05508-080, Brazil

    Isaac Jamil Sayeg

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  1. Taís Campos Scalise
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  2. Mara Cristina Lopes de Oliveira
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Correspondence to Renato Altobelli Antunes.

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Scalise, T.C., de Oliveira, M.C.L., Sayeg, I.J. et al. Sensitization Behavior of Type 409 Ferritic Stainless Steel: Confronting DL-EPR Test and Practice W of ASTM A763. J. of Materi Eng and Perform 23, 2164–2173 (2014). https://doi.org/10.1007/s11665-014-1010-z

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  • DOI: https://doi.org/10.1007/s11665-014-1010-z

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