Abstract
The surface of material can be transmitted into nanocrystalline structure by some treatments such as ultrasonic peening (USP). The surface nanocrystalline (SNC) can play a significant role in promoting the strength, stiffness and fatigue life. The effect of surface nanocrystallization for stainless-steel sheet on its static mechanical behaviors is investigted. SNC treatment leads to the yield stress and the ultimate stress of the material to rise by about 96% and 13% respectively. The nanostructured layer acts as a very strong wall to block the dislocations and slips moving out of the surface of the structure so as to harden the material. A measurement of the stress distribution in sample section is carried out by means of moire interferometry and the experimental results show that the nanostructured layer shares rather portion of load because of its high stiffness.
