Laser shock peening (LSP) is a new surface modification technology that uses laser-induced plasma shock waves to improve the fatigue life of materials. Through the mechanical action of shock waves

the plastic deformation of materials surface occurs at a high strain rate

 which can significantly improve the surface microstructure of materials

realize grain refinement

increase dislocation density

and form dislocation tangles

dislocation walls as well as other structures. Based on LSP

warm laser shock peening (WLSP) and cryogenic laser shock peening (CLSP) can further improve the residual stress stability of materials by dynamic strain aging (DSA) effect

dynamic precipitation (DP) effect

high-density deformation twinning

and stacking faults. Based on the evolution of the microstructure of metal surface

LSP technology can significantly increase the hardness and yield strength of material

 thereby effectively improve the working stability of component. In addition

LSP technology can also enhance the corrosion resistance and fatigue life of materials to broaden the application field of LSP processing materials.