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Annealing temperature effects on superduplex stainless steel UNS S32750 welded joints. II: pitting corrosion resistance evaluation

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Abstract

This study deals with the effect of the annealing temperature on the pitting corrosion resistance of UNS S32750 submerged-arc welded joints. In a companion article (Part I), the influence of post-weld annealing temperature on microstructure evolution and chemical composition of austenite and ferrite was analyzed; this study can thus be considered directly connected with the previous one. The pitting corrosion resistance of the heat-treated welded joints was evaluated by using both electrochemical measurements and ASTM G48 standard gravimetric tests; examinations of initiation sites of pitting attack were carried out in order to correlate the experimental data obtained in this study with the predicted pitting corrosion behavior obtained by using the results described in Part I. Generally, the post-weld annealing treatment enhances the pitting corrosion resistance of UNS S32750 welded joints. By using PREN analysis of single phases, a correlation between the chemical composition evolution of ferrite and austenite and the experimental pitting behavior of the welded joints was found, in relation to welding and post-welding heat treatment temperature. In particular, an exponential relationship between PREN of weaker phase and pitting potential in 3.5% NaCl solution at 80 °C for the weld metal was obtained. The most favorable annealing temperature for the analyzed welded joints was found to be 1100 °C.

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Acknowledgements

The authors gratefully acknowledge the experimental support provided by Mr. Giacomo Mazzacavallo, Dr. Enrico Della Rovere, and Dr. Vincenzo Grassi. Special thanks are also due to Rivit S.p.A. (Caltrano, VI—Italy) for the materials supply and welding.

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Authors and Affiliations

  1. Department of Management and Engineering, University of Padova, Stradella San Nicola 3, 36100, Vicenza, Italy

    R. Cervo, P. Ferro & A. Tiziani

  2. Corrosion Study Centre A. Daccò, University of Ferrara, Via G. Saragat, 4A, 44100, Ferrara, Italy

    F. Zucchi

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  1. R. Cervo
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  2. P. Ferro
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  3. A. Tiziani
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  4. F. Zucchi
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Correspondence to R. Cervo.

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Cervo, R., Ferro, P., Tiziani, A. et al. Annealing temperature effects on superduplex stainless steel UNS S32750 welded joints. II: pitting corrosion resistance evaluation. J Mater Sci 45, 4378–4389 (2010). https://doi.org/10.1007/s10853-010-4311-0

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  • DOI: https://doi.org/10.1007/s10853-010-4311-0

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