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金属学报  2020, Vol. 56 Issue (4): 653-660    DOI: 10.11900/0412.1961.2019.00398
  研究论文 本期目录 | 过刊浏览 |
铁素体-贝氏体/马氏体双相钢中界面的定量化晶体学表征
李秀程,孙明煜,赵靖霄,王学林,尚成嘉()
北京科技大学钢铁共性技术协同创新中心 北京 100083
Quantitative Crystallographic Characterization of Boundaries in Ferrite-Bainite/Martensite Dual-Phase Steels
LI Xiucheng,SUN Mingyu,ZHAO Jingxiao,WANG Xuelin,SHANG Chengjia()
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
全文: PDF(9919 KB)   HTML
摘要: 

利用两相区轧制以及增加轧制后弛豫时间的方法,获得了具有不同铁素体-贝氏体/马氏体比例的双相显微组织实验用钢样品。通过对2种实验用钢的EBSD表征发现,对铁素体间的界面和铁素体与贝氏体/马氏体之间的界面而言,如果界面具有较大的整体取向差,则通常也具有较大的解理面取向差和滑移面取向差;但是如果贝氏体和马氏体内部变体间的界面具有较大的整体取向差,则通常也具有较大的解理面取向差,但并不一定具有较大的滑移面取向差,这种现象在马氏体组织中更为显著。双相钢的塑韧性不仅受到两相比例影响,还受两相晶粒细化程度的影响,所以要提高其综合力学性能,需要从有效滑移单元和有效解理单元2个方面对双相组织分别进行细化。

关键词 双相钢显微组织晶界取向差晶粒细化    
Abstract

In this study, two dual-phase steels with different ferrite-bainite/martensite ratios were obtained by rolling in two-phase region and setting the relaxation time after rolling. The tested steel with smaller ferrite content obtained higher yield strength and tensile strength, greater total elongation and lower ductile-brittle transition temperature; while the steel with higher ferrite content obtained higher uniform elongation and lower yield strength ratio. The EBSD characterization of the two steels shows that for the ferrite-ferrite boundaries and ferrite-bainite/martensite boundaries, if the interface has a large overall misorientation angle, it usually has a large cleavage plane misorientation angle and large slip plane misorientation angle; but for the variant-variant boundaries within bainite or martensite, if the interface has a large overall misorientation angle, it usually has a large cleavage plane misorientation angle, but not necessarily has a large slip plane misorientation angle, and this phenomenon is more significant in martensite microstructure. The ductility of dual-phase steel is not only affected by the proportion of the two phases, but also influenced by the grain refinement of the two phases. Therefore, in order to improve the comprehensive mechanical properties of the dual phase steel, it is necessary to refine the dual phase microstructure from the view of effective slip unit and the effective cleavage unit.

Key wordsdual-phase steel    microstructure    grain boundary    misorientation    grain refinement
收稿日期: 2019-11-22     
ZTFLH:  TG142  
基金资助:国家重点研发计划项目(2017YFB0304900)
通讯作者: 尚成嘉     E-mail: cjshang@ustb.edu.cn
Corresponding author: Chengjia SHANG     E-mail: cjshang@ustb.edu.cn
作者简介: 李秀程,男,1983年生,博士

引用本文:

李秀程,孙明煜,赵靖霄,王学林,尚成嘉. 铁素体-贝氏体/马氏体双相钢中界面的定量化晶体学表征[J]. 金属学报, 2020, 56(4): 653-660.
Xiucheng LI, Mingyu SUN, Jingxiao ZHAO, Xuelin WANG, Chengjia SHANG. Quantitative Crystallographic Characterization of Boundaries in Ferrite-Bainite/Martensite Dual-Phase Steels. Acta Metall Sin, 2020, 56(4): 653-660.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00398      或      https://www.ams.org.cn/CN/Y2020/V56/I4/653

PassDQ810AC730

Thickness

mm

Temperature

Rolling reduction ratio / %

Thickness

mm

Temperature

Rolling reduction ratio / %
0801200-801200-
168110015.068110015.0
255105019.755105019.7
344100020.044100020.0
43395025.03495022.7
52783018.22883021.4
62382014.82481014.3
72081013.0227408.3
8---207309.1
表1  2种实验用钢的热轧工艺
图1  2种实验用钢显微组织的OM像
图2  2种实验用钢的低倍EBSD像及整体取向差5°以上界面(红线)分布图

Steel

Yield strength

MPa

Tensile strength

MPa

Yield ratio

Uniform elongation

%

Total elongation

%

DQ8105507990.6910.125.6
AC7304577530.6111.922.8
表2  2种实验用钢的拉伸力学性能
Steel-40 ℃-60 ℃-80 ℃
DQ810147, 149, 181 (average: 159)123, 139, 161 (141)28, 43, 14 (28)
AC73050, 44, 38 (44)22, 39, 15 (25)17, 16, 11 (15)
表3  2种实验用钢的系列低温Charpy冲击韧性 (J)
图3  DQ810样品的EBSD像及5°以上界面(红线)分布图,及点A到点B连线上各界面的取向差角度
图4  AC730样品的EBSD像及5°以上界面(红线)分布图,及点A到点B连线上各界面的取向差角度
图5  以整体取向差统计的2种实验用钢界面密度图(直方图)与分布图(线形图)
图6  以解理面取向差统计的2种实验用钢界面密度图(直方图)与分布图(线形图)
图7  以滑移面取向差统计的2种实验用钢界面密度图(直方图)与分布图(线形图)
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