Abstract
Recently, it has been reported that the wear resistance of different stainless steel grades can be substantially improved by addition of boron as alloying element, however, with a trade-off in the corrosion resistance. In this work, CALPHAD method was employed to design a ferritic and an austenitic stainless steel modified with 1 wt pct B with high corrosion resistance. The designed alloys were produced by conventional casting in graphite mold and characterized by X-ray diffraction (XRD), optical microscopy and scanning electron microscopy (SEM). Structural characterization revealed that the target microstructures composed of ferrite and austenite matrixes with hard borides were successfully achieved. Their corrosion resistance was evaluated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests in synthetic seawater and compared to conventional 316 L stainless steel. It was shown that designing the chemical composition of the alloys’ matrixes is the key to obtain corrosion resistant boron-modified stainless steels.
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03 May 2021
A Correction to this paper has been published: https://doi.org/10.1007/s11661-021-06290-w
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Acknowledgments
This study was financed in part by the Coordenacão de Aperfeiçoamento de Pessoal de Nível Superior – Brasil (CAPES) – Finance Code 001. The authors thank the Laboratory of Structure Characterization (LCE) of the Department of Materials Engineering (DEMa) of Federal University of São Carlos (UFSCar) for the electron microscopy facilities. Dr. Eduardo Netto de Souza and Eng. Victor Spósito (Villares Metals S.A.) are gratefully acknowledged for providing the stainless steels used in this study.
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Manuscript submitted September 7, 2020; accepted February 25, 2021.
The original online version of this article was revised: The legend in Fig. 10a was corrected.
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dos Santos, E.R., da Silva, W.A., Koga, G.Y. et al. Corrosion Resistant Boron-Modified Ferritic and Austenitic Stainless Steels Designed by CALPHAD. Metall Mater Trans A 52, 2708–2719 (2021). https://doi.org/10.1007/s11661-021-06226-4
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DOI: https://doi.org/10.1007/s11661-021-06226-4