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金属学报  2015, Vol. 51 Issue (8): 897-903    DOI: 10.11900/0412.1961.2014.00620
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珠光体层片取向对冷拔珠光体钢丝形变的影响*
周立初1,胡显军2,马驰3,周雪峰1,蒋建清1,方峰1()
2 江苏省(沙钢)钢铁研究院, 张家港 215625
3 盛利维尔(中国)新材料技术有限公司, 常州 213200
EFFECT OF PEARLITIC LAMELLA ORIENTATION ON DEFORMATION OF PEARLITE STEEL WIRE DURING COLD DRAWING
Lichu ZHOU1,Xianjun HU2,Chi MA3,Xuefeng ZHOU1,Jianqing JIANG1,Feng FANG1()
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189
2 Sha-Steel Iron and Steel Research Institute of Jiangsu Province, Zhangjiagang 215625
3 Sunnywell (China) New Material Technology Co. Ltd., Changzhou 213200
引用本文:

周立初,胡显军,马驰,周雪峰,蒋建清,方峰. 珠光体层片取向对冷拔珠光体钢丝形变的影响*[J]. 金属学报, 2015, 51(8): 897-903.
Lichu ZHOU, Xianjun HU, Chi MA, Xuefeng ZHOU, Jianqing JIANG, Feng FANG. EFFECT OF PEARLITIC LAMELLA ORIENTATION ON DEFORMATION OF PEARLITE STEEL WIRE DURING COLD DRAWING[J]. Acta Metall Sin, 2015, 51(8): 897-903.

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摘要: 

利用TEM, SEM和纳米压痕仪研究了珠光体钢丝在冷拉拔形变过程中, 珠光体层片取向对其形变及力学性能的影响. 结果表明: 与拉拔轴向夹角较小的珠光体层片, 通过珠光体团旋转, 使珠光体层片转向平行于拉拔轴向, 并率先形成铁素体<110>丝织构; 铁素体中位错由单滑移到多滑移, 最终变成同一滑移系的单滑移, 位错分布较均匀, 渗碳体与铁素体保持协调变形. 与拉拔轴向夹角较大的珠光体层片, 通过弯折转向接近平行拉拔轴向, 渗碳体发生断裂碎化、铁素体中形成位错胞, 造成后续形变困难, 层片缓慢减薄. 经拉拔形变后, 平直珠光体的显微硬度高于弯折珠光体, 表明接近平行于拉拔轴向的珠光体层片加工硬化率较高, 有利于形变强化.

关键词 珠光体钢丝冷拉拔珠光体层片取向塑性变形    
Abstract

Cold drawing pearlitic steel wires with ultra-high strength have important applications such as the automobile tire, springs rope and bridge cables. There have been many investigations which are paid attention to the hardening mechanisms of pearlitic steel wire, covering evolution of microstructure, texture and dislocation. In this work, effects of pearlitic lamella orientation on mechanical properties and deformation of pearlite steel wire in cold drawing were investigated by combining TEM, SEM and nano-indentor. The experimental results showed that pearlitic lamellae having low angle with drawing direction would be turned to parallel the drawing direction through a combined rotating process of pearlite colonies. The <110> fiber texture in the ferrite phase formed and the distribution of dislocations in ferrite was almost uniform. The deformation between cementite and ferrite was coordinated. Pearlitic lamellae having large angle with drawing direction would be bent and turned to parallel the drawing direction. It was difficult for the bent pearlite to deform because of the fragmentation of cementite and formation of dislocation cell in ferrite. After cold drawing process, the micro-hardness of straight pearlite was higher than that of bent pearlite. The result indicated that pearlitic lamellae having low angle with drawing direction have higher working-hardening rate in drawing.

Key wordspearlitic steel wire    cold drawing    pearlitic lamella orientation    plastic deformation
    
基金资助:* 国家自然科学基金项目51371050和51301038, 江苏省科技成果转化专项项目BA2014088及江苏省产学研前瞻性研究项目BY2014127-03资助
图1  不同应变量的珠光体钢丝纵截面的SEM像
图2  不同应变量的平直珠光体的STEM像
图3  不同应变量弯折珠光体的STEM像
图4  不同层片取向珠光体应变量为1.1时纳米压痕后的SEM像
图5  应变量为2.5时珠光体钢丝的STEM像
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