Corrosion behavior of laser powder bed fusion manufactured nickel-free stainless steels in high-temperature water

: Goel, Sneha; Bojinov, Martin; Capek, Jan; Saario, Timo; Polatidis, Efthymios; Kantonen, Tuomas; Salminen, Antti; Blankenburg, Malte; Ganvir, Ashish; Que, Zaiqing

Publisher: Elsevier Ltd

: 2024

: Corrosion Science

: 112410

: 239

: 1879-0496

DOI: https://doi.org/10.1016/j.corsci.2024.112410(external)

: https://doi.org/10.1016/j.corsci.2024.112410(external)

: https://research.utu.fi/converis/portal/detail/Publication/457769728(external)

The paper presents a comprehensive investigation of electrochemical behavior of laser powder bed fusion (PBF-LB/M) nickel-free stainless steels in high-temperature water. The PBF-LB/M nickel-free steels processed with various laser parameters and heat treatments exhibit tunable microstructures. Electrochemical impedance spectroscopy (EIS) indicates a 2–3 times lower oxidation rate for the nickel-free steels compared to wrought 316 L. The outer layer crystallites on nickel-free steels are close to pure Fe oxides. The significantly lower concentration of Ni in the inner oxide and at the alloy/oxide interface account for the important variations of the parameters of water reduction/hydrogen oxidation reactions than wrought 316 L.

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SG, TS and ZQ acknowledge the funding from the Euratom research and training program 2014–2018 under grant agreement No. 945300 , European Union – NextGenerationEU and the support from the European Union Horizon 2020 research and innovation program under grant agreement no. 857470 . MB acknowledges funding from National Recovery and Resilience Plan of the Republic of Bulgaria (Grant No. BG-RRP-2.004-0002 “BiOrgaMCT”). TK, AS and AG acknowledge the funding support from Tenure-Track grant to Prof. Ganvir by University of Turku; Department of Mechanical and Materials Engineering for supporting the MSc thesis of Mr. Tuomas Kantonen and Research Council of Finland as well as European Council for co-funded M.ERANET 2022, GREEN-BAT (2022-2025) project. JC thanks the financial support from the Strategic Focus Area Advanced Manufacturing (SFA-AM) initiative of the ETH Board. The authors would further like to express their gratitude for the helpful discussions and experimental contributions from Aki Toivonen, Tiina Ikäläinen, Johanna Lukin and Taru Lehtikuusi of VTT.