拉丝过程中温升对高碳钢丝扭转性能的影响

Influence of temperature increasing during wire drawing on the torsional property of high-carbon steel wire

设计了一系列的模拟试验,研究了拉丝过程中温升对高碳钢丝扭转性能的影响,确定了钢丝扭转性能恶化的临界回火温度为140℃。三维原子探针分析结果表明:渗碳体中的碳原子在回火过程中发生溶解且在铁素体中局部偏聚,聚集的碳原子对位错运动起到了钉扎作用,降低了铁素体的塑性,这是钢丝扭转性能下降的根本原因。

A series of simulation tests were designed to investigate the influence of temperature increasing during wire drawing on the torsional property of high carbon steel wire.The results show that the torsional property will decrease if the temperature is above 140 ℃.The results of three dimensional atom probe show that the carbon atoms will migrate from cementite to ferrite and concentrate in some places in the ferrite during tempering.The concentrated carbon can pin the dislocations during torsion and result in plasticity decreasing of ferrite,which deteriorates torsional property of steel wire.