Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7981048 | Materials Science and Engineering: A | 2014 | 60 Pages |
Abstract
Ultrasonic surface rolling process (USRP) is a novel surface nanocrystallization technique based on severe plastic deformation (SPD). The combination of static extrusion and dynamic impact generates intensive plastic deformation, which leads to the strengthening of the material surface. The present paper aims to investigate the mechanical properties of material surface after USRP. For this purpose, nano-indentation tests were adopted to obtain the load P and penetration depth h. Dimensional analysis of test results (P-h curves) was then performed for determining the microplasticity of the treated material locally. The values of yield strength and strain hardening exponent of the surface layer were calculated and verified by finite-element simulation. Good agreement was obtained between experimental curves and simulated ones. The microstructural evolution of the surface treated by USRP was discussed to interpret the mechanism of surface strengthening. Finally, effects of USRP parameters including static force, vibration amplitude and repeated processing numbers on the variation of plastic parameters in the surface layer were discussed.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Yu Liu, Xiaohui Zhao, Dongpo Wang,