Cold deformation for ameliorating the corrosion resistance of 654SMO in a high-temperature simulated seawater environment: the combined effect of texture and twinning boundaries

• Published in: Journal of materials science 2021-11, Vol.56 (31), p.17505-17526
• Main Authors: Liao, Luhai, Li, Jingyuan, Xu, Fanghong, Zhang, Wei
• Format: Article
• Language: English
• Subjects: Analysis; Brasses; Ceramics; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cold rolling; Corrosion; Corrosion mechanisms; Corrosion resistance; Corrosion resistant steels; Crystallography and Scattering Methods; Deformation; Deformation effects; Dislocation density; Grain boundaries; Heat resistant steels; High temperature; Low temperature resistance; Marine environment; Martensite; Martensitic transformations; Materials Science; Misalignment; Polymer Sciences; Rolling texture; Sea-water; Seawater; Solid Mechanics; Stainless steels; Steel; Twin boundaries; Twinning
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-021-06449-1

The influence of cold rolling deformation on the electrochemical and corrosion behavior of 654SMO super-stainless steel in a high-temperature 3.5% NaCl solution was investigated by potentiodynamic curves, EIS, Mott–Schottky plots and XPS. Results of the electrochemical experiments and surface analyses showed that 654SMO under 33.3% reduction had a maximum deterioration in corrosion properties. After heavy deformation (55.6% and 66.7%), the corrosion resistance of 654SMO improved. XRD and EBSD were performed to illustrate the potential mechanism for the improvement in corrosion resistance. Results showed that there was no strain-induced martensite transformation for steels even under 66.7% deformation, and the dislocation density increased monotonically with an increasing deformation. The cold rolling texture of steels could be described by high Goss, S , brass and copper textures with a low brass- R component. Misorientation analysis and grain boundary characterization obtained from EBSD showed that a large number of mechanical twins formed in steels under 55.6% and 66.7% reductions. A hypothesis was proposed that the combined effect of the strong rolling texture and ∑3 twin boundaries ameliorated the corrosion resistance of 654SMO under large deformations.