STUDY OF INFLUENCE OF COLD ROLLING AND ANNEALING ON ULTIMATE TENSILE STRENGTH OF AA2024 ALLOY USING BOX-BEHNKEN EXPERIMENTAL DESIGN

This study investigates the effects of thermo-mechanical processing parameters, specifically cold rolling and annealing, on the ultimate tensile strength (UTS) of AA2024 alloy, employing a Box-Behnken experimental design. The deformation during cold rolling, the annealing temperature, and the time annealing were varied to evaluate their individual and combined effects on the UTS. The results demonstrated that the UTS increased with deformation from 50% to 60%, but decreased with higher annealing temperatures (460°C - 500°C) and extended annealing times (10 to 30 minutes. Among the parameters, annealing time exhibited the most significant influence on UTS, followed by deformation level and annealing temperature. The optimized parameters - 60% deformation, 460°C annealing temperature, and 10 minutes time annealing - predicted a UTS of 628 MPa, with experimental verification confirming a 3% deviation. This research underscores the critical importance of controlling thermo-mechanical parameters to optimize the mechanical properties of AA2024 alloy, offering valuable insights for industrial applications.