Causal relation between ultrasonic vibration cutting and corrosion resistance

In external turning of carbon steel without/with ultrasonic vibration (abbreviated to USV), the effect of crystal structure, hardness, surface roughness, residual stress and surface energy on corrosion is discussed. Corrosion of the machined surface is investigated for humid environment and salt water. As a result, in cutting without USV larger corrosion occurs, and built-up edge (abbreviated to BUE) generation and large surface roughness cause the corrosion. The position of BUE fragments corresponds to the origin of corrosion. And also, the residual tensile stress on the machined surface in cutting without USV can easily occur the crack on the machined surface, which can, in turn, increase the generation of corrosion.