Studying the influence of radial-shear rolling on the thermo-deformation conditions of aluminum AA1050 processing

The effect of deformation modes on the process conditions of radial-shear rolling (RSR) of commercial purity aluminum AA1050 is analyzed. Based on finite-element modeling (FEM), temperature variation at various feed angles and elongation in the first and last passes is obtained. An increase in the feed angle slightly raises temperature fluctuations in the surface layer due to increasing reduction per pass, but it does not significantly influence the total deformation heating during RSR. The final deformation temperature can be controlled by varying the reduction ratio. In this case, it is necessary to take into account the initial heating temperature, dimensions of final rolled products and elongation per pass. The billet size has a significant effect on thermal variations during RSR. In the last pass, when diameters are 20–14 mm, deformation heating is almost completely compensated by rod cooling in contact with the environment and the tool and begins to prevail with an increase in the elongation ratio of more than 1.2. The analysis of equivalent strain (ε_e) at various deformation modes showed that the difference in ε_e values over the rod cross-section decreases with the increasing feed angle. A comparison of the data obtained with the hardness and microstructure of rolled AA1050 samples shows that ε_e has a significant effect on changes in the structure and properties to a certain value. This is confirmed by the obtained microhardness distribution over the cross section of rods. Mechanical properties of obtained rods correspond to the properties of commercial purity aluminum in the work hardened condition (σ_в ~ 115 MPa, σ_0.2 ~ 110 MPa, δ ~ 1 %, HV ~ 40÷43).

aluminium, radial-shear rolling, finite element modelling, plastic deformation, feed angle, elongation ratio, deformation modes

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