Abstract
Effects of ultrasonic shot peening (USSP) on microstructure, strength and corrosion performances of Ni20Cr alloy were investigated. A gradient nanotwinned structure consisting of high densities of nanotwins, low angle grain boundaries and dislocations was formed. Hardness, strength-ductility synergy and corrosion resistance was enhanced simultaneously. Deformation mechanism varying with strain level was discussed. X-ray photoelectron spectroscopy (XPS) showed that thinner passive film with higher Cr3+ content formed after USSP, which might be accounted for the improvement in corrosion resistance. This work develops a simple method to enhance mechanical properties and corrosion resistance simultaneously in industrial Ni-Cr alloys.
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