异构中碳双相钢丝的微观组织与力学性能

doi:10.13251/j.issn.0254-6051.2023.07.006

金属热处理 ›› 2023, Vol. 48 ›› Issue (7): 32-37.DOI: 10.13251/j.issn.0254-6051.2023.07.006

异构中碳双相钢丝的微观组织与力学性能

刘宜林¹, 陈如柑², 贾玉心², 李玉胜¹, 范雯¹, 郑小腾³

1.南京理工大学材料科学与工程学院纳米结构材料中心, 江苏南京 210094;
2.贝卡尔特亚洲研发中心, 江苏江阴 214400;
3.绍兴市特种设备检测院, 浙江绍兴 312000

收稿日期:2022-12-19 修回日期:2023-05-13 出版日期:2023-07-25 发布日期:2023-09-04
通讯作者: 李玉胜,教授,博士,E-mail:liyusheng@njust.edu.cn
作者简介:刘宜林(1998—),女,硕士研究生,主要研究方向为异质结构材料,E-mail:liuyilin@njust.edu.cn。

Microstructure and mechanical properties of heterostructured medium carbon dual-phase steel wire

Liu Yilin¹, Chen Rugan², Jia Yuxin², Li Yusheng¹, Fan Wen¹, Zheng Xiaoteng³

1. Nano Structural Materials Center, School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing Jiangsu 210094, China;
2. Bekaert (Asia) Research and Development Center, Jiangyin Jiangsu 214400, China;
3. Shaoxing Special Equipment Testing Institute, Shaoxing Zhejiang 312000, China

Received:2022-12-19 Revised:2023-05-13 Online:2023-07-25 Published:2023-09-04

摘要/Abstract

摘要： 运用异构材料理念,通过冷拉拔和临界热处理工艺制备了异构中碳双相钢丝。通过光学显微镜和扫描电镜研究了钢丝冷拉拔和热处理后的微观组织结构,并通过拉伸和硬度试验测试了力学性能,探讨了微观组织与力学性能的关系。结果表明,冷拉拔大变形处理结合短时间的临界热处理工艺,促进马氏体相变,减少铁素体再结晶,可以有效地调控组织结构,得到大量马氏体包裹细小铁素体的理想异构双相组织。随着拉拔应变量以及热处理温度的增加,马氏体体积分数增加,铁素体晶粒尺寸减小,钢丝的强度和硬度显著提高,可与高碳钢丝的强度相比。异构中碳双相钢丝的优异力学性能来源于铁素体晶粒细化、马氏体相变时在铁素体内产生的大量位错和马氏体/铁素体异质结构力学不相容性带来的非均匀变形。

关键词: 钢丝, 热处理, 异构材料, 双相钢, 力学性能

Abstract: Heterogeneous medium carbon duplex steel wire was prepared by cold drawing and subsequent annealing process based on the emerging heterogeneous materials concept. The microstructure and mechanical properties were studied by means of optical microscope, scanning electron microscope, hardness and tensile tests, and the relationship between microstructure and mechanical properties was investigated. The results show that cold drawing with large deformation combined with short-time intercritical annealing can effectively control the microstructure, which can promote martensite transformation and reduce ferrite recrystallization, and an ideal heterogeneous duplex structure of fine ferrite surrounded by a large amount of martensite was introduced. With the increase of cold drawing strain and annealing temperature, the volume fraction of martensite increases, the grain size of ferrite decreases, and the strength and hardness of the steel wire are significantly improved, which is equivalent to that of high carbon steel wire. The superior properties of the heterogeneous medium carbon duplex steel wire is come from ferrite grain refinement, a large number of dislocations generated in ferrite during martensitic transformation, and non-uniform deformation caused by mechanical incompatibility of heterostructure structures of martensite/ferrite.

Key words: steel wire, annealing, heterostructured materials, dual-phase steel, mechanical property

中图分类号:

TG142.1

刘宜林, 陈如柑, 贾玉心, 李玉胜, 范雯, 郑小腾. 异构中碳双相钢丝的微观组织与力学性能[J]. 金属热处理, 2023, 48(7): 32-37.

Liu Yilin, Chen Rugan, Jia Yuxin, Li Yusheng, Fan Wen, Zheng Xiaoteng. Microstructure and mechanical properties of heterostructured medium carbon dual-phase steel wire[J]. Heat Treatment of Metals, 2023, 48(7): 32-37.

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异构中碳双相钢丝的微观组织与力学性能

Microstructure and mechanical properties of heterostructured medium carbon dual-phase steel wire

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