Structural aspects of deformation hardening with repeated drawing low carbon wire

Abstract

While repeated drawing of low carbon wire, a decrease in the grain size of ferrite reduces the parameters of deformation hardening in the initial field of deformations with parabolic hardening and increases in the field of substructural hardening with large and extra‑large total compressions. The transition from large to super‑large total deformations goes along with the development of dynamic return processes that reduce the rate of deformation hardening. Preliminary thermal softening of cold‑formed wire increases the strength gain during subsequent drawing and can be used to increase the total compression of the wire rod before intermediate heat treatment.

Keywords

• ferrite grain size
• forest dislocations density
• distance between structural barriers
• structural irregularity of deformation
• parameters of deformation hardening