Laser shock processing and aluminizing compound technology used on steel blade

Scanning electron microscopy (SEM), X-ray diffraction (XRD) and other techniques were used to detect the influence of laser shock processing (LSP) on aluminizing layer, which is infiltrated into the stainless steel blade for antisepticising. The results show that the aluminizing layer will be destroyed when LSP is implemented after aluminizing. And the quality of aluminizing layer will be improved while LSP is implemented before aluminizing. The influence on the LSP by the high temperature in the course of aluminizing was studied through residual stress test and metallographic analysis. After 150 minutes in the condition of aluminizing temperature 510°C, the residual compressive stress in the LSP zone was still -295 MPa and the refined grain did not grow up remarkably. The residual compressive stress and grain refinement layer induced by LSP had good thermo stability. Finally, the vibration fatigue performance of different states stainless steels was tested. When the maximum stress is 660 MPa, the fatigue life of "LSP before aluminizing" is about 3.98 × 10 ⁶, which is about fourteen times than that of aluminizing.