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Welding Heat Input Influence on UNS S82441 Lean Duplex Stainless Steel Corrosion Resistance Assessed by Scanning Vibrating Electrode Technique (SVET)

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Abstract

The precipitation of the intermetallic phases can impair mechanical and corrosion properties. In the case of lean duplex stainless steels, they present solidification mode as primary ferrite, with austenite precipitation in the solid state, during cooling. This means the heat-affected zone balanced microstructure can be changed during the welding by the cooling rate, which is associated to the welding heat input, the thickness of the plate and the physical properties of the material. This work intends to present the influence of welding heat input on the corrosion resistance of UNS S82441 lean duplex stainless steel. The gas metal arc welding process was used to make the weld beads, using ER2209 as filler metal, which characterizes a dissimilar welded joint. The corrosion resistance of these specimens was analyzed through scanning vibrating electrode technique. It was observed that welding heat input variation distinctly influences corrosion in different zones of the weld beads over the specimen exposure time. The weld bead under intermediate welding heat input showed the highest corrosion rate and the one under the highest welding heat input, the lowest corrosion rate intensity.

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Acknowledgments

The authors appreciate Outokumpu for the donation of UNS S82441 duplex stainless steel plates, the University of São Paulo for the physical structure used in the tests and Voith Hydro for supplying the filler metals.

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Authors and Affiliations

  1. Metallurgy and Materials Engineering Department, University of São Paulo – Escola Politécnica, São Paulo, SP, Brazil

    Evandro Armini de Pauli, Jaime Casanova Soeiro Junior & Sérgio Duarte Brandi

  2. Chemical Engineering Department, University of São Paulo – Escola Politécnica, São Paulo, SP, Brazil

    Fernando Cotting & Idalina Vieira Aoki

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  1. Evandro Armini de Pauli
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  2. Fernando Cotting
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  3. Jaime Casanova Soeiro Junior
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  4. Idalina Vieira Aoki
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  5. Sérgio Duarte Brandi
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Correspondence to Evandro Armini de Pauli.

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de Pauli, E.A., Cotting, F., Junior, J.C.S. et al. Welding Heat Input Influence on UNS S82441 Lean Duplex Stainless Steel Corrosion Resistance Assessed by Scanning Vibrating Electrode Technique (SVET). J. of Materi Eng and Perform 27, 6389–6397 (2018). https://doi.org/10.1007/s11665-018-3721-z

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  • DOI: https://doi.org/10.1007/s11665-018-3721-z

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