Journal of South China University of Technology (Natural Science Edition) ›› 2013, Vol. 41 ›› Issue (10): 92-96.doi: 10.3969/j.issn.1000-565X.2013.10.015

• Materials Science & Technology • Previous Articles     Next Articles

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)

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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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