Peculiarities of Microstructure Changing on Outer Surface of Carbon Steel Wire at Combined Deformational Processing by Drawing with Torsion

Drawing is the basic operation of wire manufacturing. At drawing a wire contacts with a die resulting in decrease of its diameter. During this interaction wire microstructure changes, especially on the contact area between a die and a wire. Specificity of microstructure changing on outer surface of carbon steel wire at drawing and its combination with torsion is presented in the paper. Using optical microscopy, it was found out that in the outer surface of carbon steel wire a narrow layer of highly deformed grains is formed. It is shown that thickness of this layer depends on the deformational processing intensity and is very specific depending on carbon content of the wire.