Description
The hardened layer at the surface of fine-drawn wire, the additional shear strain layer, is around 0.04 mm in depth and is generated by the friction between dies and wire. The main purpose of this paper is to clarify the tensile strength and microstructure of the additional shear strain layer. It was found that the layer is hardened in drawing with a low semi-angle die. It was also found that there is a correlation between an increase in tensile strength and the subdivisions of crystal grains in the additional shear strain layer.
