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Wear and Corrosion Resistances of Active Screen Plasma-Nitrided Duplex Stainless Steels

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Abstract

Two grades of duplex stainless steel, SAF 2205 and SAF 2507, were nitrided using an active screen plasma process carried out at 380 °C for 10 h and were characterized in terms of microstructure and hardness. Wear resistance was assessed by means of linear scratch tests, using loads below and above the critical load. Potentiodynamic polarization was used to analyze corrosion behavior in 0.6 M NaCl solution. X-ray diffractometry showed expanded austenite formation in all nitrided samples. The super duplex steel SAF 2507 showed much better scratch resistance, with low friction coefficient and greater toughness, as judged by the pattern of superficial cracks when it was tested above the critical load. The corrosion behavior of steels was also different, mainly in the active region, and nitriding had a more beneficial effect upon SAF 2507. The potential relative to the transpassive region was practically unaffected by the nitriding.

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Acknowledgments

G. Pintaude thanks the CNPq Brazilian Funding Agency for support of his scholarship through the project “Low-Temperature Plasma Nitriding of Superduplex Stainless Steel” (process 233074/2014-7). The authors thank S. C. Gallo for assistance with nanoindentation tests and Z. Zhang for assistance with plasma treatments. The authors also thank the Multi-User Center for Materials Characterization (CMCM) of the UTFPR for SEM analysis and Sandvik do Brasil S/A for supplying duplex stainless steel bars.

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Authors and Affiliations

  1. Surface and Contact Lab (LASC), Federal University of Technology - Paraná, Rua Deputado Heitor Alencar Furtado, 5000, Curitiba, 81280-340, Brazil

    Giuseppe Pintaude, Ane C. Rovani & Julio C. Klein das Neves

  2. Earth Science Department, Federal University of Paraná, Curitiba, Brazil

    Leonardo E. Lagoeiro

  3. School of Metallurgy and Materials, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK

    Xiaoying Li & Hanshan S. Dong

Authors
  1. Giuseppe Pintaude
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  2. Ane C. Rovani
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  3. Julio C. Klein das Neves
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  4. Leonardo E. Lagoeiro
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  5. Xiaoying Li
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  6. Hanshan S. Dong
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Correspondence to Giuseppe Pintaude.

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Pintaude, G., Rovani, A.C., das Neves, J.C.K. et al. Wear and Corrosion Resistances of Active Screen Plasma-Nitrided Duplex Stainless Steels. J. of Materi Eng and Perform 28, 3673–3682 (2019). https://doi.org/10.1007/s11665-019-04114-y

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  • DOI: https://doi.org/10.1007/s11665-019-04114-y

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