Effect of Shot Peening and High-Temperature Shot Peening on the High Cycle Fatigue of 7010-T7452 Aluminum Alloy

FatigueFatigue failure remains a significant concern in engineering applications, especially in the aerospace and automotiveAutomotive industries where aluminum alloysAluminum alloys are widely used. Shot peeningShot peening is an attractive surfaceSurface treatment procedure to enhance the fatigue lifeFatigue life of materials. In this study, shot peeningShot peening at room temperature and 250 °C was performed at an Almen intensity of 0.20 mmA, on AA7010-T7452 aluminum alloyAluminum alloys fatigueFatigue specimens. The influence of the peening process on surface roughnessSurface roughness, hardnessHardness, and fatigue lifeFatigue life was investigated. Results showed that the average surface roughnessSurface roughness increased by 2.5 times and hardnessHardness increased by 4.6% as the temperature increased. TEM observations showed that the precipitation changed significantly during high-temperature shot peeningShot peening. High cycle fatigueFatigue tests revealed that HTSP at 250 °C decreased the fatigue lifeFatigue life of specimens by 2.6 times to 76% compared to specimens peened at room temperature. The decrease in fatigue lifeFatigue life of specimens peened at high temperature is due to the high surface roughnessSurface roughness.