Quenching residual stresses in T-section 7050 aluminum alloy forging
Keywords:Aluminum alloy, Residual stress, Finite element method, X-ray diffraction, Contour method, Layer removal method
Distribution of quenching residual stresses in T-section 7050 aluminum alloy forging was obtained using a combination method of finite element method (FEM), contour method, layer removal method and X-ray diffraction. The results show that, experimental results and FEM result of internal residual stresses are in good agreement. While surface stresses obtained by layer removal method and contour method are slightly different with X-ray diffraction and FEM results, thus X-ray diffraction measurement of surface stresses must be taken into consideration to fully understand the distribution of quenching stresses in the T-section 7050 aluminum alloy forging. Moreover, surface residual stresses are compressive of about -150MPa, while residual stresses in the core are tensile with a maximum up to 210MPa, which is very harmful for the subsequent machining.