采用正交试验法对冷拔至不同直径80WVRe钢丝的双相区球化退火工艺进行优化。结果表明: 奥氏体化温度、等温时间、等温温度、保温时间对3.39 mm钢丝退火后硬度的影响程度相当, 等温时间对1.91 mm钢丝退火后硬度的影响程度明显大于其它三因素; 对于3.39 mm钢丝, 当奥氏体化温度为760 ℃、保温时间为60 min、等温温度为690 ℃、等温时间为360 min时, 组织中碳化物的均匀性及圆整度最佳, 此时的硬度为175 HV0.5; 对于1.91 mm钢丝, 当奥氏体化温度为760 ℃、保温时间为90 min、等温温度为690 ℃、等温时间为240 min时, 组织中碳化物的均匀性及圆整度最佳, 此时的硬度为177 HV0.2。

Adopting orthogonal test to research the spheroidizing annealling process in dual-phase region of cold drawn 80WVRe steel wire. The results show, austenizing temperature, isothermal time, isothermal temperature and holding time had almost equivalence effects on hardness of 3.39 mm steel wire, while isothermal time had an obviously larger effect on hardness of 1.91 mm steel wire than the another three factors. The optimal spheroidizing annealing process of 3.39 mm steel wires was as follows: with austenizing temperature 760 ℃, holding time 60 min, isothermal temperature 690 ℃, isothermal time 360 min, uniformity and roundness of granule carbonization were improved markedly and hardness of the steel wire was 175 HV0.5. The optimal spheroidizing annealing process of 1.91mm steel wires was as follows: with austenizing temperature 760 ℃, holding time 90 min, isothermal temperature 690 ℃, isothermal time 240 min, uniformity and roundness of granule carbonization were improved markedly and hardness of the steel wire was 177 HV0.2.