Abstract
The softening characteristics of cold-drawn pure copper wires were studied in relation to hot-working processes and impurities of hot worked Cu wire rods. The characteristics of several kinds of hot-rolled wire rods were examined by means of structural observations, tensile tests and electrical resistivity measurements. The softening characteristics of cold-drawn copper wires were obtained from spring elongation tests and electrical resistivity measurements of 90% cold-drawn wires.It was found that the grain size and Cu2O particle size of the continuous casting and rolling rod (SCR: Southwire Continuous Rod) were the smallest and its Cu2O particle distribution was uniform. On the other hand, the grain size of Oxygen Free Copper (OFC) wire rod was the largest and its electrical conductivity was the highest. SCR cold-drawn copper had the lowest softening temperature. Specimens of copper wires could be arranged according to the order of softening tendencies by annealing:\ oindentSCR>TPC 1(normal Tough Pitch Copper)>OFC>TPC 3(Tough Pitch Copper with 16 ppm Pb and 11 ppm Sn).\ oindentA large amount of annealing twins was observed in the SCR wires.From these experimental results, the softening characteristics of the cold-drawn copper wires are considered to be related to metallurgical structure which depends on the hot-working processes and purities.
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