Mechanical characterization and evaluation of pitting corrosion resistance of a superferritic stainless steel model alloy 25Cr–6Mo

Mechanical characterization and evaluation of pitting corrosion resistance of a superferritic stainless steel model alloy 25Cr–6Mo–5Ni

Published:2023-06-28 Issue:12 Volume:114 Page:1070-1079
ISSN:1862-5282
Container-title:International Journal of Materials Research
language:en
Short-container-title:

Author:

Uchôa Reis Francisco Evaristo¹,Mourão dos Santos Luis Paulo²,Moura Lorena Braga³,Oliveira de Castro Mirela⁴,de Lima Neto Pedro²,Cardoso Jorge Luiz⁴^ORCID,Gomes de Abreu Hamilton Ferreira⁴

Affiliation:

1. Department of Engineering and Technology-DET , Federal Rural University of the Semi-Arid , Mossoró , Brazil

2. Graduate Program of Materials Science and Engineering , Federal University of Ceará , Fortaleza , Brazil

3. Federal Institute of Ceará - Reitoria, Federal Institute of Ceará , Fortaleza , Brazil

4. Department of Metallurgical and Materials Engineering , Federal University of Ceará , Fortaleza , Brazil

Abstract

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.

Publisher

Walter de Gruyter GmbH

Subject

Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics

Link

https://www.degruyter.com/document/doi/10.1515/ijmr-2021-8447/pdf

Reference32 articles.

1. Tverberg, J., Blessman, E. Condenser Technology, Seminar and Conference, 2002.

2. Ng, P. G., Clarke, E., Khoo, C. A., Fourlaris, G. Mater. Sci. Technol. 2006, 22, 852–858. https://doi.org/10.1179/174328406X91140.

3. Olubambi, P. A., Potgieter, J. H., Cornish, L. Mater. Des. 2009, 30, 1451–1457. https://doi.org/10.1016/j.matdes.2008.08.019.

4. Villanueva, D. M. E., Junior, F. C. P., Plaut, R. L., Padilha, A. F. Mater. Sci. Technol. 2006, 22, 1098–1104. https://doi.org/10.1179/174328406X109230.

5. Guo, T. M., Zhang, D. C., Han, C. S., Hui, Z., Zhao, L. M. Adv. Mater. Res. 2012, 476, 263–268. https://doi.org/10.4028/www.scientific.net/AMR.476-478.263.