A technique to decrease surface roughness in overlapping laser shock peening

作者：Dai, Fengze^*; Zhou, Jianzhong; Lu, Jinzhong; Luo, Xinmin

来源：Applied Surface Science, 2016, 370: 501-507.

DOI：10.1016/j.apsusc.2016.02.138

• Elastic contact laser shock peening
• Surface roughness
• Residual stress

A technique called elastic contact laser shock peening (ECLSP) is presented in this paper. In this technique, a metal foil with high dynamic yield strength is fixed between absorbing layer and workpiece, and the peak pressure of laser shock wave is a little less than the dynamic yield strength of metal foil, but higher than the Hugoniot Elastic Limit (HEL) of work piece. Surface roughness, microhardness and residual stress are investigated. Compared with regular laser shock peening (LSP), ECLSP can reduce the depth and area of secondary plastic deformation of overlapping region. This can effectively reduce surface roughness in overlapping LSP. Measurement of microhardness and residual stress shows that the work hardening effects and strengthening effect are similar as regular LSP.

• 出版日期2016-5-1
• 单位江苏大学