Shot peening applied on parabolic leaf spring is a mechanical surface treatment intended to improve the fatigue strength by generating residual compressive stress. However, a systematic investigation of the effect of shot peening parameters on residual stresses is still required. The aim of the present work is to improve the knowledge of the role of shot peening in manufacturing leaf springs vehicles, through analyzing effects of different shots peening parameters by X-ray diffraction analysis. Among this investigation the parameters of the shot penning machine; turbine speed, amperage presented by the Almen intensity and the deflection of spring has been varied to optimal performance regarding residual stress. X-ray diffraction analysis shows that; on the one hand; the increase of shots speed and subsequently the Almen Intensity improves the residual stress at depth but the surface stress decreases. On the other hand, spring deflection improves the residual stress profile.
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