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Influence of the aging time on the microstructure and electrochemical behaviour of a 15-5PH ultra-high strength stainless steel

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Luo,  Hong
Alloy Design and Thermomechanical Processing, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;

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Citation

Luo, H., Yu, Q., Dong, C., Sha, G., Liu, Z., Liang, J., et al. (2018). Influence of the aging time on the microstructure and electrochemical behaviour of a 15-5PH ultra-high strength stainless steel. Corrosion Science, 139, 185-196. doi:10.1016/j.corsci.2018.04.032.


Cite as: https://hdl.handle.net/21.11116/0000-0001-E615-4
Abstract
The effect of the aging time at 500 °C on the microstructure evolution and electrochemical behaviour of 15-5PH ultra-high strength martensitic stainless steel is presented. The results show that Cu-rich clusters and (Cu, Nb)-rich nanoparticles are observed from 1 min to 240 min. The aging time influences the pitting resistance and semiconductive behaviour of the passive film in a chloride solution. The disappearance of Cu species in the passive film after 240 min is attributed to the precipitation of Cu-rich nanoparticles. Moreover, the variations in the Cr/Fe ratio and dehydration effect with the aging time are discussed. © 2018 Elsevier Ltd