Water Jet Shot Peening Strengthening Surface Roughness

Shot peening pressure, nozzle scanning velocity, and target distance were chosen as effect factors when shot peening test to 45 steel and 2Al1 aluminum alloy material was made by water jet. Adopted stylus method for measuring shot peening surface roughness Ra and Ry, observed macroscopically shape character of shot peening surface by scanning electron microscope. The results indicated that shot peening pressure, nozzle scanning velocity, target distance caused uniform effect rules on shot peening surface roughness of 45 steel and 2Al1 aluminum alloy material, surface roughness Ra augments as the increase of shot peening pressure and minishs as the increase of scanning velocity, furthermore, there exists the biggest surface roughness target distance. When shot peening target distance was less than the biggest surface roughness target distance, surface roughness Ra and Ry tend to augment as the increase of target distance and inversely proportional to the material strength. When gives less original surface roughness and lower shot peening pressure, it’s not suitable for using Ry to represent shot peening surface roughness but Ra. When shot peened excessively, the surface of the material occurred body exfoliation and corrosion.