华南理工大学学报(自然科学版) ›› 2013, Vol. 41 ›› Issue (10): 92-96.doi: 10.3969/j.issn.1000-565X.2013.10.015

• 材料科学与技术 • 上一篇    下一篇

双相钢中残留奥氏体的分布及演变规律

李辉 段路昭 米振莉 赵征志 唐荻   

  1. 北京科技大学 冶金工程研究院,北京 100083
  • 收稿日期:2013-05-14 修回日期:2013-07-03 出版日期:2013-10-25 发布日期:2013-09-03
  • 通信作者: 米振莉(1971-),女,教授,主要从事汽车用钢的研究 E-mail:mizl@nercar.ustb.edu.cn
  • 作者简介:李辉(1983-),男,博士生,主要从事特殊钢的组织性能研究. E-mail:wenjinglh@163.com
  • 基金资助:

    国家自然科学基金资助项目( 50904006 ) ; 北京科技大学中央高校基本科研业务费专项资金资助项目( 2302011FRFTP11005B)

Distribution and Evolution of Retained Austenite in Dual-Phase Steel

Li Hui Duan Lu-zhao Mi Zhen-li Zhao Zheng-zhi Tang Di   

  1. Engineering Research Institute,University of Science and Technology Beijing,Beijing 100083,China
  • Received:2013-05-14 Revised:2013-07-03 Online:2013-10-25 Published:2013-09-03
  • Contact: 米振莉(1971-),女,教授,主要从事汽车用钢的研究 E-mail:mizl@nercar.ustb.edu.cn
  • About author:李辉(1983-),男,博士生,主要从事特殊钢的组织性能研究. E-mail:wenjinglh@163.com
  • Supported by:

    国家自然科学基金资助项目( 50904006 ) ; 北京科技大学中央高校基本科研业务费专项资金资助项目( 2302011FRFTP11005B)

摘要: 在双相钢( 铁素体+马氏体,DP) 的基础上通过合理的热处理工艺得到一定量的残留奥氏体,达到强度和塑性的良好结合. 通过光学显微镜分析、X 射线衍射分析和背散射电子衍射分析等方法研究了该DP 钢的微观组织,并进一步分析了残留奥氏体随形变量的演变规律. 结果表明:残留奥氏体晶粒细小,主要呈粒状,均匀地分布在铁素体或马氏体的晶界位置,也有少量分布在铁素体内部; 残留奥氏体的转变主要集中在形变量小于10%之前,之后的转变与应变成线性关系,拉伸断裂后未发现残留奥氏体.

关键词: 双相钢, 热处理, 残留奥氏体, 形变量, 演变规律

Abstract:

A certain amount of retained austenite in the dual phase steel was obtained through a rational heat treatmentprocess,and the steel thus achieved a good combination of strength and plasticity.Then,the microstructure ofthe DP steel was investigated by means of the optical metallography,XRD and the electron back-scatter diffraction( EBSD),and the evolution rules of the retained austenite during the deformation were discussed.The results showthat ( 1) the retained austenite is fine and mainly granular,and most of it distributes uniformly at the boundaries offerrites and /or martensites with few in the ferrites; ( 2) the transformation of retained austenite mainly occurs at thedeformation extent of less than10%,and it is linearly related to strain at the deformation extent of more than 10%;and ( 3) in the EBSD observation,the retained austenite is not found in the fractured sample after tensile fracture.

Key words: dual phase steel, heat treatment, retained austenite, deformation extent, evolution rule

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