Abstract
High-intensity ultrasonic vibration was focused on the tip of conical steel specimens to induce severe plastic deformation at room temperature. We found, for the first time, that grain size smaller than 200 nm was obtained. Furthermore, the sharp tip of the conical specimen became umbrella-shaped or disk-shaped. The tip size changed from 0.5 mm diameter to a disk about 5 mm diameter, representing a large amount of plastic deformation in the metal at the tip of the conical specimen.
Highlights
Nanostructured materials offer unique and entirely different mechanical, electrical, optical, and magnetic properties compared with conventional micro or millimeter-sized materials
The sharp tip of the specimen became “umbrella” shaped almost instantly when ultrasonic vibration was applied to the specimen
It is worth to note that the elongation of the hot rolled AISI 1010 steel is only about 28% and the forming limit for rolling the steel at room temperatures is usually less than 40% per pass
Summary
Nanostructured materials offer unique and entirely different mechanical, electrical, optical, and magnetic properties compared with conventional micro or millimeter-sized materials. Chen et al (2000) [13], using a Multi-Axis Restraint Compression process which is capable of achieving extremely large strains with constant deformation volume, obtained grain size about one micron and an ultimate tensile strength 2 times higher than that of the conventionally hot rolled plain carbon steel (AISI 1018). These recent developments suggest that methods that can produce severe plastic deformation have the potential for the production of nanostructured materials. To overcome the fatigue failure issue, we used external compressive forces to offset the instantaneous tensile stress induced by ultrasonic vibration since the stresses are additive in nature
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