The effect of heat treatment on torsion characteristics of core for transmission conductors

송전선 강심의 비틀림 특성에 미치는 열처리의 영향

The effect of heat treatment on torsion characteristics of high nitrogen steel wire has been studied by using torsion test, micro vickers hardness and scanning electron microscopy. After heat treatment at $600{\sim}700^{\circ}C$, torsion cycle was increased with increasing temperature. Especially, in case of high nitrogen steel wire heat treated at $650^{\circ}C$, torsion cycle was sharply increased. It is estimated that the cold-worked high nitrogen steel wire started to recrystallize around at $640^{\circ}C$ in air atmosphere.