CONTROL OF MICROSTRUCTURES OF FERRITE/BAINITE (F/B) DUAL-PHASE STEELS AND ANALYSIS OF THEIR RESISTANCE TO DEFORMATION BEHAVIOR

被引：24
|
作者：
Nie Wenjin [1 ,2 ]
Shang Chengjia [1 ]
Guan Hailong [1 ]
Zhang Xiaobing [2 ]
Chen Shaohui [2 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
[2] Jiangsu Shagang Grp, Zhangjiagang 215625, Peoples R China
来源：
ACTA METALLURGICA SINICA | 2012年 / 48卷 / 03期
关键词：
ferrite/bainite dual-phase steel; work-hardening behavior; yield ratio; uniform elongation; modified C-J analysis; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; VOLUME FRACTION; MARTENSITE;
D O I：
10.3724/SP.J.1037.2011.00634
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Five ferrite/bainite (F/B) dual-phase steels with the chemistry of low carbon, high manganese and high niobium, and different volume fractions of bainite (15%-98%) were produced by control rolling+relaxing+ACC processing. With the help of the modified Crussard-Jaoul (C-J) analysis, the effects of soft phase (ferrite) content and its grain size on the work-hardening behavior of the steels and the cooperative deformation relationship between softer phase and harder phase were studied, which was validated by EBSD analysis. The results illustrate that a reasonable proportion of F/B can be helpful to improve initial work-hardening (a high R-t1.5/R-t0.5), reduce the yield ratio, and maintain a high uniform elongation. It is known that the cooperative deformation of ferrite and bainite is the main mechanism for improving the stress ratio and the uniform elongation of the F/B dual-phase steels.
引用
收藏
页码：298 / 306
页数：9
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