Insight into the microstructural features and corrosion properties of wire arc additive manufactured super duplex stainless steel (ER2594)

•WAAM process is a promising technology for fabricating super duplex stainless steel components.•WAAM processed SDSS 2594 exhibited excellent pitting resistance and corrosion rate ranged between 1.54 and 1.61 mpy.•The PREN was > 40 for all samples and conforms the NACE standards recommended for o...

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Bibliographic Details
Published in:	Materials letters 2020-07, Vol.270, p.127680, Article 127680
Main Authors:	Rajesh Kannan, A., Siva Shanmugam, N., Rajkumar, V., Vishnukumar, M.
Format:	Article
Language:	eng
Subjects:	Corrosion Corrosion rate Corrosion resistance Corrosion tests Duplex stainless steels Electrochemical corrosion Electrochemical impedance spectroscopy Electrode polarization Gas metal arc welding Intergranular corrosion Microstructure Photomicrographs Pitting (corrosion) Super duplex stainless steel WAAM Welding Wire
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Summary:	•WAAM process is a promising technology for fabricating super duplex stainless steel components.•WAAM processed SDSS 2594 exhibited excellent pitting resistance and corrosion rate ranged between 1.54 and 1.61 mpy.•The PREN was > 40 for all samples and conforms the NACE standards recommended for oil and gas industries.•DLEPR test revealed no sensitization, which is due to the absence of detrimental phases and comparable microstructure. This work investigates the understanding between microstructure and corrosion behaviour of SDSS 2594 wall component fabricated using gas metal arc welding (GMAW) based wire arc additive manufacturing (WAAM) process, with the help of optical micrographs and electrochemical corrosion tests. Potentiodynamic polarization tests and Electrochemical impedance spectroscopy (EIS) analysis in 3.5% NaCl solution revealed excellent pitting resistance while the corrosion rate ranged between 1.51 and 1.61 mils per year (mpy) with pitting resistance equivalent number (PREN) > 40. The intergranular corrosion (IGC) test results confirmed the absence of sensitization and highlights that the formation of passive film is compact for corrosive environments.
ISSN:	0167-577X 1873-4979