Surface nanocrystallization and enhanced surface mechanical properties of nickel-based superalloy by coupled electric pulse and ultrasonic treatment

Coupled electric pulse and ultrasonic treatment (CEPUT) is easy to cause severe plastic deformation on Inconel 718 nickel-based superalloy surface with high strength and high hardness. Moreover, the top surface grain with the average size of 25.8 nm and the nanocrystalline layer with the thickness of more than 40 μm are prepared on processed Inconel 718 surface. In CEPUT, the electric pulse can increase the material plasticity, accelerate the...