双相钢冷拔钢丝的自然时效

Natural Aging of Cold Drawn Dual-Phase Steel Wire

研究了09Mn2Si热轧态双相钢冷拔钢丝经6个月自然时效后的力学性能和显微组织的变化。结果发现,无论是冷拔态钢丝还是冷拔-回复态钢丝,均呈现明显的自然时效现象。冷拔态钢丝经6个月自然时效后,强度提高而塑性降低。但是,对于冷拔-回复态钢,不仅强度提高,而且塑性也有明显改善。用透射电镜对钢丝金属薄膜进行了组织观察,并对两种不同的自然时效特性进行了讨论。

The effects of natural aging on mechanical properties and micro-structure of cold drawn dual-phase steel wire have been invastigated. It is found that the effect of natural aging for 6 monthe on the mechanical properties and microstructure of dual-phase steel wires is obvously, either of cold drawn or cold-drawn and followed by recovering before natural aging. In the case of cold-drawn, the tensile strength is increased during natural aging, while the ductility is reduced. However, in the case of cold-drawn and followed by recovering, the tensile strength is incresed during natural aging, while the ductility is also increased. The microstructures of steel wire have been observed by means of TEM. The resons of effect of natural aging on the mechanical properties were discussed.