Quenching residual stresses in T-section 7050 aluminum alloy forging

摘要

7050 aluminum alloy is widely used in aerospace, and T-section A17050 forgings are used for manufacturing the connecting part of wing and fuselage, owing to their high specific strength, toughness and good corrosion resistance in many environments [1,2]. While in the manufacturing processes of aluminum alloy forgings especially in the quenching process, high residual stresses are introduced inevitably, which cannot be thermally relieved while maintaining the alloy's favorable mechanical properties, and cannot be relieved by traditional pre-stretching as aluminum plate due to their complex structure. The existence of unknown residual stresses in the aluminum alloy forgings is a major reason leading to serious deformation after the forgings are machined to components, which is fatal to the aerospace manufacturing. Thus, to obtain the distributions of quenching residual stresses in aluminum alloy forgings is very important.