Numerical Modeling of the Residual Stress Induced by multi-impact Shot Peening process on Carburized Fe-0.85Mo-0.35C and Fe-1.5Mo-0.3C Steel Materials

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Addis Ababa University


Shot peening is a surface treatment process in which a large number of small shots are impact an engineering component to generate a compressive residual stress layer at the surface of the component. The compressive residual stress increase fatigue life, resistance to stress corrosion, refine grain size, improve microhardness and prevent crack propagation on the component. However, improper shot peening process parameters would affect the surface quality, and have negative effect on the fatigue performance. The experimental assessment of shot peening process parameters is not only very complex but costly as well. In this paper, a sequential model of multiple-shot impacts has been established to investigate the shot peening process on a carburized prealloyed Fe-0.85Mo-0.35C and Fe-1.5Mo-0.3C steels. A commercial Finite Element Method ABAQUS/Explicit was used to model and simulate the process. The sequential model was applied for the predication of residual stress along the depth profile was obtained in the impact region. Furthermore, the numerical results of compressive residual stress were compared with the experimental result obtained using the x-ray diffraction (XRD) analysis. A parametric study is conducted to investigate the effect of shot velocity, diameter, initial stress and coverage on the residual stress profile. The result demonstrated that increasing shot velocity, diameter and coverage results an increase the surface compressive residual stress and decrease depth of compressive residual layer. On the other hand, initial residual stress increase depth of compressive residual stress layer. The simulation result was in good agreement with the measured result for both steels.