Volgograd State Technical University (Volgograd, Russia)

V. F. Danenko, Cand. Eng., Associate Prof., Deputy Head of “Materials Technology” dept.
L. M. Gurevich, Cand. Eng., Associate Prof., Head of “Material science and Composite materials” dept.
R. E. Novikov, Post-graduate, “Material science and Composite materials” dept. E-mail: omd@vstu.ru

The infl uence of the scale factor on the strain state of the metal layers of the deformed zone in drawing wire with diam. 3.3 mm and 1.3 mm was studied by finite element simulation. It was established earlier achievement for each transition the finite values of strain of the central layers of the deformed zone in the longitudinal and radial directions, as well as an increase in the value of additional shear of the near-surface layers at drawing wire with diam. 3.3 mm, which promotes an increase in the plastic strain resistance and a decrease in the plasticity of the metal of these layers. With increasing total reduction, the resistance of plastic strain of peripheral layers decreases due to an increase in the contribution of alternating shear strain. The constancy of the value of the linear strain determined by the angle of inclination of the corresponding curves to the longitudinal axis is shown for the middle part of the deformed zone in the longitudinal and radial directions. The irregularity of strain along the cross-section of the wire during drawing is suggested to be  evaluated by comparing the values of longitudinal strain of the central and peripheral layers of the middle part of the deformed zone. With a general reduction not more than 60%, the ratio between the longitudinal strain of the central and peripheral layers when drawing wire with diam. 3.3 mm is 20–50% higher than the wire with diam. 1.3 mm, which indicates an increase in the irregularity of the strain in the volume of the metal. It is experimentally established that the strength and ductility of colddrawn wire with diam. 1.3 mm are increased in comparison with a wire with diam 3.3 mm. It is experimentally established that the strength and ductility of cold-drawn wire with diam. 1.3 mm are increased in comparison with a wire with diam. 3.3 mm. The difference in the values of microhardness of the surface and central layers of the wire with diam. 3.3 mm is due to the effect of the irregularity of layerwise strain on the structure over the volume of the metal.

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