Study the effect of cold working on the mechanical properties of aluminum alloy 2024 T4

Abstract

This paper studied the effect of cold working process on (AA2024-T4). shot peening and burnishing processes were utilized in this work. different times of peening (2, 4, 6,8,16 and 24 min) and two parameter of burnishing process (feed rate, spindle speed) were used to analysis the effect of these processes on the mechanical characteristic of aluminum alloy 2024 T4. Fatigue strength, surface hardness and surface roughness were studied. It was observed the shot peening and burnishing process leads to improve fatigue strength of AA2020 T4. The best value of fatigue strength (219 MPa) was obtained in burnishing process at spindle speed (720rpm) and constant feed rate (0.1). This improvement in fatigue life due to compressive residual stresses introducing on alloy's surface. The highest vales of surface hardness and roughness were(394HVN)) and (8.1 μm) that obtained at (24min) times of shot peening process.