engleski

Influence of cold reduction on the structure and hardness of cold drawn copper wire

The production of copper wires involves the application of various processing operations thatlead to the certain structural changes. The electrical properties of wire depend on certain structural hanges. Research was carried out on copper wire produced by the UPCAST process. Copper wire was subsequently subjected to the cold drawing through the dies in multiple passes. The structural changes in the process of cold drawing of Cu-wire were observed. During the cold drawing of Cu-wire through dies, a significant change in deformed structure occurred in relation to the initial cast structure. The microstructure analysis and hardness values of the deformed sample indicated that during the initial reduction the majority of the deformation was performed at the surface area of the Cu-wire that was in contact with the die. The initial equiaxed grains at the surface of the Cu-wire elongated in the drawing direction as a consequence of the deformation degree increase.

cold drawing, copper wire, microstructure, hardness

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