Experimental Analysis of Shot Peening Parameters on EN9

Engineering components and structures are regularly subjected to alternating loads, which made them prone to fatigue failures. It is well known fact that almost all fatigue cracks form at surface due to variety of surface stress concentration features, including grain boundaries, machining marks, surface breaking inclusions. Fatigue performance of metallic parts depends on three factors: Metallurgical, surface geometry and residual stress. The residual stresses are mainly of two types i.e. tensile residual stresses and compressive residual stresses. Tensile residual stresses are responsible for detrimental effects on the component and compressive residual stresses for beneficial effects on the components. The shot peening is the process by which the compressive residual are induced in the component and that increases surface hardness which can be helpful to avoid the fatigue failure of the component. The performance of the shot peening can be measured by the Arc height and the Almen Intensity. The experimental study made with the help of RSM and validation by the regression and ANOVA of shot peening process on the chain link used in the conveyors.