Simulation of Shot Peening Process For GH4169 Superalloy

Abstract

Shot peening process is done by a number of high-speed shots striking the surface of the workpiece which generates a compressive stress field on the surface, that prevents fatigue cracks from initiating and propagating and makes the workpiece last longer. Tensile stress usually forms in metal parts during the machining, casting, and other metal working process, it is known that tensile stress decreases the service life of machined parts, so shot peening enhances machined parts life by inducing negative compressive stress. This research presents a three-dimensional finite element dynamic and static analysis of a shot hitting a metal target plate and how the shot-peening process affects several key parameters such as shot speed, shot size, and shot angle. The finite element program ABAQUS 2017 is applied to simulate the technique that is used in the experiments. The shape of the target plate is considered deformable plate that is 1 mm by 1 mm by 0.3 mm and the size of the shot was between 0.2 mm to 0.4 mm. It is assumed that shot is completely spherical, discrete, and rigid, and mass is in the center of it. The material utilized for the model was a GH4169 superalloy which is mostly used in aeronautical industry, and the shots here utilized has ceramics property. The findings of the ABAQUS simulation demonstrated that, when shot velocity, shot size, and incident angle increased, the amplitude and depth of the residual stress field that is formed in the target plate also increased. This work also indicates the proposed finite element analysis has capability of investigating the influence of various parameters on the shot peening process.