Mechanical characterization and evaluation of pitting corrosion resistance of a superferritic stainless steel model alloy 25Cr–6Mo–5Ni
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Francisco Evaristo Uchôa Reis
and
Hamilton Ferreira Gomes de Abreu
Abstract
The mechanical properties and corrosion resistance of annealed superferritic stainless steel model alloy 25Cr–6Mo–5Ni were investigated in 0.6 M NaCl solution. The microstructure consisted of a ferrite matrix and eutectoid phase with a lamellar structure distributed at grain boundaries and within the ferrite grains with a spherical morphology. Tensile and impact results suggested brittle behavior of the model alloy. Fractography analysis revealed typical cleavage facets, river patterns and micro-cracks at grain boundaries and across the ferrite grains. Pitting corrosion began within the eutectoid phase, which contains in chrome depletion zones. Electrochemical impedance spectroscopy measurements suggest that the breakdown of passive films was more susceptible in the eutectoid phase.
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The authors would like to thank the Brazilian agencies CNPq, CAPES and FUNCAP for financial support and to the FAI (Fundição de Aço Inox Ltda) company from Brazil for providing the SFSS model alloy 25Cr-6Mo-5Ni used in this research. Luis P. M. Santos thanks the CAPES scholarship (88882.463158/2019-01) PNPD/CAPES.
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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- News
- DGM – Deutsche Gesellschaft für Materialkunde
Articles in the same Issue
- Frontmatter
- Original Papers
- Nanocrystalline PbS thin film produced by alkaline chemical bath deposition: effect of inhibitor levels and temperature on the physicochemical properties
- Effect of laser power on microstructure and tribological behavior of laser clad NiCr coating
- Mechanical characterization and evaluation of pitting corrosion resistance of a superferritic stainless steel model alloy 25Cr–6Mo–5Ni
- Factors dictating the extent of low elongation in high sulfur-containing bainitic steels
- Effect of process parameters on mechanical properties and wettability of polylactic acid by fused filament fabrication process
- Critical systematic investigation of the Cd–Ce system: phase stability and Gibbs energies of formation and equilibria via thermodynamic description
- Experimental study of the phase relations of the Fe–Pt–Ho ternary system at 500 °C
- Ultraviolet-B radiation from Gd (III) doped hardystonite
- Photoluminescence features of trivalent holmium doped Ca2La8(SiO4)6O2 phosphors
- Thermal stability of Al3BC3 powders under a nitrogen atmosphere
- News
- DGM – Deutsche Gesellschaft für Materialkunde
