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金属学报  2019, Vol. 55 Issue (5): 585-592    DOI: 10.11900/0412.1961.2018.00319
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低温回火对超大形变冷拔珠光体钢丝显微组织和力学性能的影响
冯汉臣1,闵学刚2,魏大圣1,周立初1,崔世云2,方峰1()
1. 东南大学材料科学与工程学院 南京 211189
2. 江苏省宝钢精密钢丝有限公司 南通 226114
Effect of Low Temperature Annealing on Microstructure and Mechanical Properties of Ultra-Heavy Cold-DrawnPearlitic Steel Wires
Hanchen FENG1,Xuegang MIN2,Dasheng WEI1,Lichu ZHOU1,Shiyun CUI2,Feng FANG1()
1. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China
2. Jiangsu Bao Steel Precision Steel Wire Co., Ltd., Nantong 226114, China
全文: PDF(48884 KB)   HTML
摘要: 

采用力学分析、SEM、TEM、3DAP和DSC技术研究了低温回火对超大应变冷拔珠光体钢丝微观组织和力学性能的影响。结果表明:应变ε≤4的钢丝,在120~170 ℃范围内进行低温回火能有效提高钢丝的强度,同时塑性略有下降;ε=3.0的钢丝,在150 ℃回火8 min后,钢丝强度提高约150 MPa;ε=4.5的钢丝,在170 ℃回火后,钢丝强度和塑性同时下降。钢丝经超大应变(ε=4.5)变形后,渗碳体发生分解。冷拔钢丝在150~170 ℃之间存在明显的放热峰,TEM衍射斑分析发现了衍射斑点拖尾的现象,这主要是由于在150 ℃热处理后,C原子在位错处偏聚引起的;而HRTEM分析表明,在170 ℃处理后,渗碳体由非晶转变为纳米晶,有效地钉扎和阻碍位错运动,这2种现象共同导致了钢丝的低温回火强化。

关键词 珠光体钢丝冷拔低温回火处理抗拉强度渗碳体    
Abstract

Ultra-heavy cold-drawn pearlite wires provide an excellent combination of ductility and strength. Therefore, they have been widely used in engineering applications, such as suspension bridge cables, automotive tyre cords and cutting wires. In this work, the effects of low temperature annealing on the microstructure and mechanical properties of ultra-heavy cold-drawn pearlitic steel wires were investigated. The mechanical properties have been determined by tensile testing and the structures analyzed by TEM and HRTEM. The overall carbon contents in the detected volumes as well as the carbon concentrations in ferrite and cementite were measured by 3DAP. Experimental results show that, for the steel wires with strain (ε) less than 4, annealing in the range of 120~170 ℃ could effectively increase the strength of steel wires and remain most of the plastic performance. The tensile strength of wire with a strain of 3.0 can be increased about 150 MPa after annealing at 150 ℃ for 8 min. However, both of strength and toughness of steel wires with a strain 4.5 decreased after annealed at 170 ℃. After the steel wire is deformed by excessive strain (ε=4.5), the cementite decomposed obviously. DSC analysis showed that there is an obviously exothermic peak between 150 ℃ and 170 ℃ in the DSC curve. The TEM diffraction pattern analysis reveal the phenomenon of tailing at diffraction pattern, which is mainly caused by segregation of carbon atom at the dislocation after annealed at 150 ℃. However, HRTEM images show that annealing temperature as low as 170 ℃ could result in the transformation of partial cementite from amorphous state to nano-crystalline state. It could effectively pin and hinder the movement of dislocations. The underlying mechanism responsible for changes in microstructure and mechanical properties after annealing at low temperature are closely related to C-segregation and "crystal-amorphous" cementite transformation in heavy cold-drawn pearlitic steel wires.

Key wordspearlitic steel wire    cold-drawn    low temperature annealing    tensile strength    cementite
收稿日期: 2018-07-09     
ZTFLH:  TG142  
基金资助:国家自然科学基金项目(51371050);江苏省333工程资助项目(BRA2018045);江苏省科技成果转化资金专项项目(BA2017112);江苏省六大人才高峰计划项目(2015-XCL-004)
通讯作者: 方峰     E-mail: fangfeng@seu.edu.cn
Corresponding author: Feng FANG     E-mail: fangfeng@seu.edu.cn
作者简介: 冯汉臣,男,1991年生,博士生

引用本文:

冯汉臣,闵学刚,魏大圣,周立初,崔世云,方峰. 低温回火对超大形变冷拔珠光体钢丝显微组织和力学性能的影响[J]. 金属学报, 2019, 55(5): 585-592.
Hanchen FENG, Xuegang MIN, Dasheng WEI, Lichu ZHOU, Shiyun CUI, Feng FANG. Effect of Low Temperature Annealing on Microstructure and Mechanical Properties of Ultra-Heavy Cold-DrawnPearlitic Steel Wires. Acta Metall Sin, 2019, 55(5): 585-592.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00319      或      https://www.ams.org.cn/CN/Y2019/V55/I5/585

图1  不同回火温度下不同应变(ε)冷拔钢丝的抗拉强度随回火时间的变化曲线
图2  不同应变下冷拔钢丝经不同温度回火32 min前后的工程应力-应变曲线
图3  盘条及冷拔钢丝(ε=3.0)经170 ℃回火处理32 min前后的显微组织
图4  ε=3.0冷拔钢丝经170 ℃回火处理32 min前后纵截面显微组织的TEM明场像和暗场像
图5  冷拔钢丝(ε=3.5)经170 ℃回火32 min前后的HRTEM分析
图6  ε=4.5时冷拔钢丝C原子三维空间分布图及垂直方向和水平方向的C浓度分布
图7  ε=4.0时冷拔钢丝经150 ℃回火32 min后纵截面TEM明场像及电子衍射花样
图8  不同应变冷拔珠光体钢丝的DSC曲线
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