|
|||||
|
|
Laser-shock processing effects on surface microstructure and mechanical properties of low carbon steel |
|
| Authors: | JP Chu JM Rigsbee G Bana HE Elsayed-Ali |
| Affiliation: | aInstitute of Materials Engineering, National Taiwan Ocean University, Keelung, Taiwan, ROC bDepartment of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA cDepartment of Materials Science and Engineering, University of Alabama at Birmingham, Birmingham, AL 35294, USA dDepartment of Electrical and Computer Engineering, Old Dominion University, Norfolk, VA 23529, USA |
| Abstract: | The effects of laser-shock processing (LSP) on the microstructure, microhardness, and residual stress of low carbon steel were studied. Laser-shock processing was performed using a Nd:glass phosphate laser with≈600 ps pulse width and up to 120 J pulse energy at power densities above 1012 W cm−2. The effects of shot peening were also studied for comparison. Laser-shock induced plastic deformation caused the surface to be recessed by≈1.5 μm and resulted in extensive formation of dislocations. Surface hardness increased by up to 80% after the LSP. The microstructure and mechanical properties were altered up to≈100 μm in depth. The LSP strengthening effect on low carbon steel was attributed to the presence of a high dislocation density. Shot peening resulted in a relatively higher compressive residual stress throughout the specimen than did LSP. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |