Laser Peening of Ti-6Al-4V Super-Alloy: Effect of Coverage Rate on Thin Leading Edges of Turbine Blade

As an advanced surface processing technique, laser peening is used extensively to enhance the wear, fatigue and corrosion resistance of various specimens by means of compressive residual stress. The present paper will examine the effect of coverage rate on a leading edge of turbine blades. In this context, a 3D model of thin leading-edge parts made of Ti-6Al-4V is performed with ABAQUS software. The objective of this simulation involves the prediction of fundamental effects induced by the square laser spot overlapping: residual stress, plastic strain and damage. Besides the plastically affected depth, these induced mechanical effects progressively increase with increasing coverage rate. In addition, increasing the overlapping rate between two consecutive square laser pulses enhances the magnitude of residual stresses, plastic depth, plastic deformation and Johnson-Cook damage.