Abstract
The microstructural alterations suffered during the process of drawing deformation and subsequent annealing of pearlitic steel wires, were evaluated by scanning electron microscopy and atomic force microscopy. The deformed material showed the curling structure in cross section while, in the longitudinal section, the lamellae was aligned with the drawing direction. The microstructural characterization of deformed samples also allowed observing an interlamellar spacing reduction and the intermediate lamellae alignment process. After the heat treatment at 1000oC for 5 min the microstructure was restored, however, few recrystallized grains were observed. The recovery was the dominant phenomenon, due to factors associated with curling structure that inhibited recrystallization.
Highlights
The combination of high resistance associated with acceptable levels of ductility of the high carbon steels allows their application in various sectors, such as stay cables, piano strings, beads, etc
The wire drawing process employs a series of wire dies to reduce the cross-section of the wire and at the end of the process is applied heat treatment to restore mechanical properties
Many aspects related to the properties of high carbon steel wires are still not clear, such as microstructural changes resulting from drawing, hardening properties typical of pearlitic steels, formation of the curling structure, etc[4]
Summary
The combination of high resistance associated with acceptable levels of ductility of the high carbon steels allows their application in various sectors, such as stay cables, piano strings, beads, etc. These steels have been, for many years, the topic of considerable scientific research[1]. The structure predominantly pearlitic is responsible for this combination of properties. Many aspects related to the properties of high carbon steel wires are still not clear, such as microstructural changes resulting from drawing, hardening properties typical of pearlitic steels, formation of the curling structure, etc[4]
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