Abstract
Shot peening, which usually serves as a final treatment on the components’ surface, greatly alters the surface geometrical and mechanical states. In this study, shot peening experiments using ceramic beads with a diameter of 0.3 mm are performed on the Inconel 718 alloy with varied peening intensity and coverage. The surface roughness, microhardness, and residual stress from shot peening and turning are characterized by a laser scanning confocal microscope, Vickers hardness tester, and X-ray diffraction to evaluate the influence of peening parameters. The results show that the shot peening treatment decreases the surface roughness of the specimens, and the roughness decreases with increasing intensity in the range of 0.13-0.17 mmA. Moreover, the shot peening intensity has a greater influence on the microhardness and residual stress of the shot peening surface compared with coverage. A surface with a large compressive residual stress profile (-1221 MPa in the axial direction) and a high hardness gradient (538.3 HV0.2 at a depth of 50 μm) is formed after the TPI3C3 process (shot peening with the peening intensity of 0.17 mmA and coverage of 300% after turning). The results of this research will provide guidance for developing more effective shot peening strategies.
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