冷拉SAE1008低碳钢丝强化机制的探讨  

Strengthening mechanism of a low carbon SAE1008 steel wire during cold drawing

作　　者：张必明[1] 赵宇飞[1] 胡显军 麻晗 方峰[1] 蒋建清[1] 

机构地区：[1]东南大学江苏省先进金属材料高技术研究重点实验室,江苏南京211189 [2]江苏省(沙钢)钢铁研究院,江苏苏州215625

出　　处：《材料热处理学报》2014年第1期115-119,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51371050);江苏省自然科学基金(BK2011616);江苏省产学研前瞻性研究(BY2011144);张家港市科技攻关(ZKJ1013)

摘　　要：利用SEM,TEM和XRD等分析手段研究SAE1008低碳钢丝冷拔形变过程中微观组织和力学性能的变化规律。结果表明,钢丝的抗拉强度随着应变增加呈线性上升,基本符合Hall-Petch关系。应变较小时,钢丝的加工硬化率基本不变;当应变增加到3.03以后,钢丝的加工硬化率显著提高。冷拔过程中,横截面上铁素体晶粒明显细化,纵截面上晶粒逐渐被拉长呈片层状。形变过程中,铁素体片层中沿着拉拔方向会形成强烈的<110>丝织构。大应变后铁素体中位错密度也急剧增加,形成了大量的位错胞。The evolutions of microstructure and mechanical properties of a low carbon SAE1008 steel wire during cold drawing were investigated by means of SEM, TEM and XRD. The results show that the tensile strength of the wire increases linearly with the increasing of strain, which is basically followed the relationship of Hall-Petch. When the strain is small, the work hardening rate of the wire is almost unchanged, but it significantly improves with the strain increasing to 3.03. Ferrite grains in transverse section are refined and lamellar in longitudinal section of the wire deforms during cold drawing. With increasing strain the strong 〈 110 〉 fiber texture forms in ferrite along the drawing direction. The dislocation density and dislocation cells in ferrite lamellar increases significantly after large deformation.

关 键 词：低碳钢丝 冷拔形变 强化机制 位错 织构 

分 类 号：TG142.4[一般工业技术—材料科学与工程]