华南理工大学学报(自然科学版) ›› 2014, Vol. 42 ›› Issue (6): 65-72.doi: 10.3969/j.issn.1000-565X.2014.06.011

• 材料科学与技术 • 上一篇    下一篇

1300MPa 级C-Si-Mn 系冷轧超高强钢的组织及性能

赵征志 佟婷婷 董瑞 丁然 张聪 孟祥   

  1. 北京科技大学 冶金工程研究院∥现代交通先进金属材料与加工技术北京实验室,北京 100083
  • 收稿日期:2014-02-21 修回日期:2014-04-01 出版日期:2014-06-25 发布日期:2014-05-01
  • 通信作者: 赵征志(1977-),男,博士,副研究员,主要从事汽车用先进高强钢开发等研究. E-mail:zhaozhzhi@ustb.edu.cn
  • 作者简介:赵征志(1977-),男,博士,副研究员,主要从事汽车用先进高强钢开发等研究.
  • 基金资助:

    国家自然科学基金资助项目(51271035)

Microstructure and Properties of 1300MPa -Grade C-Si -Mn Series Cold -Rolled Ultrahigh-Strength Steel

Zhao Zheng- zhi Tong Ting- ting Dong Rui Ding Ran Zhang Cong Meng Xiang   

  1. Engineering Research Institute,University of Science and Technology Beijing∥Beijing Laboratory of Modern Traffic Metal Materials and Processing Technology,Beijing 100083,China
  • Received:2014-02-21 Revised:2014-04-01 Online:2014-06-25 Published:2014-05-01
  • Contact: 赵征志(1977-),男,博士,副研究员,主要从事汽车用先进高强钢开发等研究. E-mail:zhaozhzhi@ustb.edu.cn
  • About author:赵征志(1977-),男,博士,副研究员,主要从事汽车用先进高强钢开发等研究.
  • Supported by:

    国家自然科学基金资助项目(51271035)

摘要: 设计了一种 C- Si- Mn 系(0.14C-1.4Si-2.72Mn)实验钢.采用热膨胀仪测定并研究了实验钢的 CCT 曲线和相变规律;通过 OM、SEM、TEM、EBSD 分析了经热轧、退火后钢板的微观组织、相分布等;用 XRD 测定了实验钢中的残余奥氏体含量.结果表明:0.14C-1.4Si-2.72Mn 实验钢具有较好的淬透性,临界冷速为 10.00℃ /s;退火后微观组织主要由马氏体、铁素体和少量残余奥氏体组成,其中部分马氏体发生回火,残余奥氏体主要以薄膜状分布在马氏体板条间,部分分布在铁素体晶粒内部,含量为 4%~6%;退火后钢板的抗拉强度可达 1333MPa,总伸长率为 13%,强度和塑性匹配较好.

关键词: 超高强钢, C- Si- Mn 系钢, 退火, 微观组织, 相分布, 残余奥氏体

Abstract:

A kind of C- Si- Mn series (0.14C-1.4Si-2.72Mn) tested steel was designed,and the CCT curves andphase transformation rules of the steel were measured by using a thermal dilatometer.Then,the microstructure andphase distribution of the tested steel sheet after hot- rolling and annealing were analyzed by means of OM,SEM,TEM and EBSD.Finally,the retained austenite content of the tested steel was measured by means of XRD.Theresults show that (1) the designed 0.14C-1.4Si- 2.72Mn tested steel possesses good hardenability and is of a criti-cal cooling rate of 10.00℃ /s; (2) the microstructure of annealed tested steel sheet is mainly composed of martens-ite,ferrite and a little amount of retained austenite; (3) the martensite is partially tempered,and the retained aus-tenite accounts for 4% ~6% and mainly distributes among martensite laths but partially distributes in the ferrite;(4) after the annealing of the tested steel sheet,the tensile strength and the total elongation reach 1333MPa and13%,respectively,and the tensile strength accords well with the ductility.

Key words: ultrahigh- strength steel, C- Si- Mn series steel, annealing, microstructure, phase distribution, retainedaustenite

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