• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2017, Vol. 53 ›› Issue (12): 133-139.doi: 10.3901/JME.2017.12.133

• 第三代高强钢汽车板 • 上一篇    下一篇

中锰钢(0.15C-5Mn-Al)冷轧ART退火组织转变与力学性能

周天鹏1, 陈泽军1,2, 曹文全3   

  1. 1. 重庆大学材料科学与工程学院 重庆 400044;
    2. 重庆大学机械传动国家重点实验室 重庆 400044;
    3. 钢铁研究总院特殊钢研究所 北京 100081
  • 出版日期:2017-06-20 发布日期:2017-06-20
  • 作者简介:

    周天鹏,男,1990年出生,博士研究生。主要研究方向为高强汽车钢组织性能控制。

    E-mail:ztp@cqu.edu.cn

    陈泽军(通信作者),男,1979年出生,博士,教授,博士研究生导师。主要研究方向为金属轧制工艺及组织性能控制。

    E-mail:zjchen@cqu.edu.cn

  • 基金资助:
    * 中央高校基本科研业务费汽车专项重点资助项目(CDJZR14135504); 20160801收到初稿,20170314收到修改稿;

Microstructure Evolution and Mechanical Properties of ART-Annealed Medium Manganese Steel (0.15C-5Mn-Al) Processed by Cold Rolling

ZHOU Tianpeng1, CHEN Zejun1,2, CAO Wenquan3   

  1. 1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044;
    2. State Key Laboratory of Mechanical Transmission, Chongqing University, Chongqing 400044;
    3. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081
  • Online:2017-06-20 Published:2017-06-20

摘要:

中锰钢是一种典型的第3代汽车钢,其冷轧后奥氏体逆转变(Austenite reverted transformation, ART)退火过程中亚稳奥氏体的有效调控是获得优异性能的关键环节之一。研究经热轧和冷轧变形后的中锰钢(0.15C-5Mn-Al)在675 ℃时奥氏体逆转变退火工艺,基于扫描电镜、电子背散射衍射、X射线衍射等微观表征技术和力学性能测试,研究退火过程中微观组织演变规律,给出奥氏体形态、含量、晶粒度等微观组织特征与力学性能之间的关系。研究表明:中锰钢(0.15C-5Mn-Al)经过合理的ART退火处理后强塑积(Rm×A)可达40 GPa·%,亚稳奥氏体的形态、含量、尺寸和稳定性对钢材的强度和塑性有重要的影响,中锰钢的塑性和强塑积随着亚稳奥氏体含量的增加而提高。

关键词: 奥氏体逆转变退火, 力学性能, 强塑积(Rm×A), 微观组织, 中锰钢

Abstract:

Medium manganese steels is a typical of the 3rd generation of automotive steel. The effective control of metastable austenites is one of the key techniques to obtain excellent performances during the austenite reverted transformation (ART) annealing process for the cold rolled medium manganese steels. This paper focus on the medium manganese steel (0.15C-5Mn-Al) and investigate the ART annealing process at 675 ℃ for the medium manganese steel undergoing hot rolling and cold rolling. The microstructure evolution and mechanical property were investigated based on the scan electron microscope, electron backscatter diffraction, X-ray diffraction characteristic techniques and mechanical properties tests. The relationships between microstructure characteristics of austenites (morphology, content, grain size etc.) and mechanical properties were described. The research indicates that the product of strength to ductility (Rm×A) of medium manganese steel (0.15C-5Mn-Al) can up to 40 GPa·% undergoing reasonable ART-annealing. The morphology, content, sizes, and stability of the metastable austenites have significant effects on the strength and plasticity of the medium manganese steels. The ductility andRm×A of medium manganese steel increased with the increase of volume fraction of metastable austenites.

Key words: austenite reverted transformation(ART), mechanical properties, microstructure, product of strength and ductility (Rm×A), medium manganese steel