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材料研究学报  2017, Vol. 31 Issue (11): 801-808    DOI: 10.11901/1005.3093.2016.733
  研究论文 本期目录 | 过刊浏览 |
基于修正C-J法和RVE模型的780 MPa级冷轧双相钢的应变硬化行为
王彦华, 黄兴民, 张雷, 郭远博, 楚珑晟, 戴光泽
1 西南交通大学材料科学与工程学院成都 610031。
2 西南交通大学材料先进技术教育部重点实验室成都 610031。
Characterization and Simulation of Strain-hardening Behavior of a Cold-rolled Dual Phase Steel of 780 MPa Grade by Means of Modified C-J Method and RVE Model
Yanhua WANG, Xingmin HUANG, Lei ZHANG, Yuanbo GUO, Longsheng CHU, Guangze DAI
1 School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China.
2 Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China.
引用本文:

王彦华, 黄兴民, 张雷, 郭远博, 楚珑晟, 戴光泽. 基于修正C-J法和RVE模型的780 MPa级冷轧双相钢的应变硬化行为[J]. 材料研究学报, 2017, 31(11): 801-808.
Yanhua WANG, Xingmin HUANG, Lei ZHANG, Yuanbo GUO, Longsheng CHU, Guangze DAI. Characterization and Simulation of Strain-hardening Behavior of a Cold-rolled Dual Phase Steel of 780 MPa Grade by Means of Modified C-J Method and RVE Model[J]. Chinese Journal of Materials Research, 2017, 31(11): 801-808.

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摘要: 

针对经不同工艺热处理的780 MPa级冷轧双相钢板,采用修正的C-J(Crussard-Jaoul)法分析了应变硬化行为,并基于真实组织形貌的代表性体积单元(Representative volume element, RVE)模型模拟其形变行为。结果表明：不同状态的实验钢均表现出较高的初始应变硬化率。岛状和针状马氏体表现出两阶段应变硬化特征,依次对应铁素体塑性变形和铁素体/马氏体协同塑性变形;当马氏体为粗大块状呈现三阶段应变硬化特征,其中第三阶段主要发生马氏体塑性变形时应变硬化能力下降明显。模拟结果表明：当块状和针状马氏体的应变集中分布在铁素体和马氏体界面,岛状马氏体的应变集中分布在马氏体块的连接部位。
关键词 ： 金属材料,  冷轧双相钢,  应变硬化,  修正C-J法,  RVE模型    
Abstract：

The strain-hardening behavior of a cold-rolled dual phase steel of 780MPa grade after different heat treatments was analyzed by a modified Crussard-Jaoul ( C-J ) method, and the deformation behavior of which was simulated with representative volume element (RVE) model. The results show that dual phase steels of different states all exhibit higher initial strain-hardening rate. The steel containing island- and needle-like martensite showed two-stage strain-hardening characteristics which related to the plastic deformation of ferrite and coordination plastic deformation of ferrite and martensite respectively, while the steel containing coarse block-like martensite exhibited three-stage strain-hardening characteristics and of which, the strain hardening capacity of the third stage decreases significantly due to the plastic deformation. The finite element method (FEM) simulation result showed that the strain concentration of the dual phase steel containing coarse block- and needle-like martensite mainly distributed in the interface of ferrite and martensite, while that containing island-like martensite distributed in junctions of martensite grains.
Key words： metallic materials    cold-rolled dual phase steel    strain hardening    modified C-J method    RVE model
收稿日期: 2016-12-20     
基金资助:资助项目四川省科技支撑计划
作者简介:

王彦华,男,1992年生,硕士生
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王彦华
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楚珑晟
戴光泽

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.733      或      https://www.cjmr.org/CN/Y2017/V31/I11/801

Elements C Si Mn Cr Ni Al Fe
Content 0.076 0.150 1.430 0.180 0.042 0.041 Bal.
表1  实验钢的化学成分(质量分数, %)
图1  热处理工艺示意图
图2  不同工艺实验钢的显微组织
F ε/% 0.15 4.05 6.03 9.09 12.98 16.99
σ/MPa 396.70 453.90 470.30 500.08 502.55 521.56
M ε/% 0.18 0.59 0.99 1.96 6.22 11.10
σ/MPa 368.89 604.61 800.01 1028.20 1345.14 1400.00
表2  模拟用铁素体和马氏体的应力-应变数据
图3  不同工艺实验钢的工程和真实应力-应变曲线
Sample YS/MPa UTS/MPa Total elongation/% UTS×TA/GPa% Martensite volume fraction/% Grain size/µm
Cold-rolled 400 800 5.32 4.16 32.06 7.69
T1 350 762 8.07 6.15 55.87 17.55
T2 260 670 11.95 8.02 32.03 6.62
T3 300 732 18.02 13.19 48.41 5.70
表3  不同工艺实验钢的组织及力学性能参数
图4  不同工艺实验钢的ln(dσ/dε)与lnσ关系曲线
图5  三种不同热处理工艺实验钢的有限元模型
图6  不同工艺实验钢的真实应力-应变实测和模拟曲线
Sample m1 m2 m3 ε1/% ε2/%
Cold-rolled 1.17 2.60 17.30 0.90 1.30
T1 1.57 3.20 16.20 0.90 1.60
T2 2.43 5.40 1.60
T3 2.40 5.42 1.50
表4  不同工艺实验钢的ln(dσ/dε)与lnσ关系曲线参数
Εavg/% 0.9 1.6 3 5 10 15
T1 F 1.41% 7.33% 33.12% 64.03%
M 0.02% 0.21% 0.37%
T2 F 0.98% 3.03% 60.50%
M 0.39% 1.30%
T3 F 0.02% 0.14% 5.82% 19.19%
M 0.10% 0.70% 1.60%
表5  不同实验钢在不同平均应变下的应变集中区域比例
图7  T1实验钢在5%应变下铁素体和马氏体的等效塑性应变分布
图8  T2实验钢在10%应变下铁素体和马氏体的等效塑性应变分布
图9  T3实验钢在15%应变下铁素体和马氏体的等效塑性应变分布
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