Comparison of the Consequences of Shot Peening Treatment Methods on the Surface Layer Characteristics of Ti6246

Abstract Shot peening, as a technique to enhance the surface characteristics of rotating parts in aircraft engines is well known as a way to prevent the initiation and propagation of cracks. However, shot peening generally increases the surface roughness and therefore, reduces aerodynamic efficiency on aerofoil. This paper aims to compare different shot peening procedures as regards roughness, hardness, residual stress magnitude and depth in Ti6246, in order to identify a method, which leads to the required mechanical properties, but keeps the increase of surface roughness to a minimum. Therefore, Ti6246 specimens, processed similarly to integral bladed compressor disks, are treated with defined target intensity and coverage. The changes in surface roughness, residual stress, and hardness are measured and discussed.