Abstract
In this work, the finite element method simulated the symmetrical hot rolling process of 7050 aluminum alloy plate. The simulation result show that different thickness layers of 7050 aluminum alloy plate experienced different temperature and strain history in the rolling process, which leads to the difference of recrystallization fraction along the thickness direction and affects the distribution of grain size. The grain size of 7050 aluminum alloy rolled plate was obtained by the metallographic test, which was in good agreement with the simulation result. The true stress-strain curve and yield strength of 7050 aluminum alloy were acquired by hot compression test. Subsequently, a prediction model of yield strength was constructed based on the Hall–Patch relationship. The result show that the predicted inhomogeneity reached 8.7%, and the difference was about 5.3% compared with that of the experimental value.
Highlights
Aluminum alloy 7050 is widely used in aerospace industries because of its high strength and fracture toughness, low density, and good corrosion resistance [1,2,3,4]
It can bethe seen that the temperature change of the rolled in recrystallization, the hot rolling process decreased with development of dynamic recrystallization, at theplate end of work influences thedynamic flow characteristics of the ametal, which leads to stress the inhomogeneous deformation hardening, and softening achieved balance and the flow tends to a steady-state value.in theItthickness direction the rolled plate
The hot compression deformation of 7050 aluminum alloy is contained of transition stage and steady state, which has obvious dynamic recovery and recrystallization
Summary
Aluminum alloy 7050 is widely used in aerospace industries because of its high strength and fracture toughness, low density, and good corrosion resistance [1,2,3,4]. Some researchers focused the influence of rolling technology upon the microstructures and mechanical properties of 7050 Al alloy sheet They found that the grain sizes, as well as their through-thickness homogeneity, were greatly improved while using smaller thickness reduction per pass (TRPP) during asymmetric rolling, which contributed to the good through-thickness homogeneity of mechanical properties [9]. Some people concentrated on reducing the hardness unevenness of 7050 aluminum alloy during quenching to improve the mechanical properties of aluminum alloy when considering high quenching sensitivity of 7xxx aluminum alloys [13] Most of these studies centered on the relationship between processing technology and microstructure. The yield strength and the inhomogeneity could be determined based on the Hall–Patch relationship and the simulation result
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