Análise da influência de parâmetros de shot peening na dureza superficial, rugosidade e tensão residual em aço ASTM A743-CA6NM

Abstract

The present work is based on the study of the treatment of shot peening, in this treatment is propelled small granules on the surface of the steel, in order to modify their mechanical properties. Thus, the main objective of this research is to evaluate the influence of pressure, angle and distance of shot peening on the behavior of residual stress, roughness, hardness and mass loss in martensitic stainless steel sheet ASTM A743-CA6NM. Two pressure levels, distance and angle of incidence of the granules were varied during the treatment. Regarding hardness, noticed a significant increase in surface hardness after shot peening, where the most influential variable parameter was the angle of attack of the granules. For roughness, the factor that had the greatest significance in the mean roughness (Ra) was the pressure. While the analysis of mass loss, was not found significant changes in any of the specimens. Regarding the study of the behavior of the residual stress, was realized that regardless of the parameters of shot peening applied, occurred a decrease in the intensity of Von Mises stress while increased the depth of the test hole drilling. Another relevant conclusion was that the treatment distance from the least influence on the Von Mises stress, while the pressure and angle of attack affected to the same degree.