深度冷拉珠光体钢丝的显微组织与力学性能
Microstructure and Mechanical Properties of Heavily Cold-draw Pearlitic Steel Wires
蓝 鹏1, 黄维刚1, 刘晓军2, 尹 皓2
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作者单位：1. 四川大学 材料科学与工程学院, 四川 成都 610065; 2. 四川圣德钢缆有限公司, 四川 德阳 618005
中文关键字：珠光体钢丝； 冷拔变形； 显微组织； 力学性能； 强化机制
英文关键字：pearlitic steel wires; cold -drawn; microstructure; mechanical property; strengthening mechanism
中文摘要：采用SEM、XRD和材料试验机研究了不同拉拔变形量下珠光体钢丝的微观组织演变以及力学性能。实验结果表明，随着拉拔应变量的增大，珠光体团发生转向，片层组织趋于拉拔方向排列，片层间距逐渐减小，渗碳体片发生明显的扭曲或塑性变形。随着应变量的增大，铁素体的{110}α、{200}α和{211}α晶面的衍射峰都发生不同程度的宽化，衍射强度降低，并出现峰位的左移。钢丝的强度和屈强比均随拉拔应变量的增大而增大，而塑性则随拉拔应变量的增大而减小。
英文摘要：The microstructure evolution and mechanical properties of pearlitic steel wires under cold-drawn deformation were studied by SEM, XRD and material testing machine. The results show that, with the increase of strain, the pearlite colonies changes its direction, the pearlitic lamellar microstructure turns to the drawing direction and the pearlite lamellar spacing decreases gradually. The lamellar cementite undergoes distortion and plastic deformation. The (110)α, (200)α and (220)α diffraction peaks become broaden and the diffraction intensity of peaks significantly reduces. At the same time, the position of the diffraction peaks shifts left. The strength and yield ratio of the steel wire drawn heavily increase and the plasticity decreases sharply with the increase of strain.