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Electrochemical investigation of pre-deformation in AISI 321stainless steels LV Jin-long, HAN Yun-tao, and LUO Hong-yun Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics Abstract: This project studied the effect of tensile deformation on the corrosion behavior of an austenitic AISI 321 stainless steel in a 5% NaCl solution, at room temperature. Pre-deformed tensile samples ranging from 6% to 30% were tested. Microstructural changes were analyzed by means of XRD, scanning electron microscope (SEM), and transmission election microscopy (TEM). An explanation of the role of the tensile pre-deformation magnitude in influencing the deformation slip band and martensite transformation, based on the results of scanning electron microscopy and XRD investigations, was proposed. The corrosion resistance of uniaxial tensile pre-deformed stainless steel was evaluated using polarization curves and electrochemical impedance spectroscopy. Results indicated that martensite transformation mechanisms included at least two types of nucleation processes. A nonlinear trend of pitting potential, with increasing deformation, was observed. The relationship between pitting corrosion and deformation structures as regards the tensile pre-deformation magnitude was discussed.
Keyword: 321 stainless steels; tensile pre-deformation; pitting corrosion; electrochemical impedance spectroscopy; martensite transformation
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