基于位错密度理论的超高强双相钢DP1000热变形本构模型

doi:10.11901/1005.3093.2016.728

材料研究学报

2017, Vol. 31

Issue (8): 576-584 DOI: 10.11901/1005.3093.2016.728

研究论文

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基于位错密度理论的超高强双相钢DP1000热变形本构模型

徐梅¹, 米振莉¹(

), 李辉², 唐荻³, 江海涛¹

1 北京科技大学工程技术研究院北京 100083
2 烟台南山学院工学院烟台 265700
3 北京科技大学钢铁共性技术协同创新中心北京 100083

Constitutive Model Based on Dislocation Density Theory for Hot Deformation Behavior of Ultra-high Strength Dual Phase Steel DP1000

Mei XU¹, Zhenli MI¹(

), Hui LI², Di TANG³, Haitao JIANG¹

1 Institute of Engineering Technology, University of Science and Technology Beijing, Beijing 100083, China
2 College of Engineering,Yantai Nanshan University, Yantai 265700, China
3 Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China

引用本文:

徐梅, 米振莉, 李辉, 唐荻, 江海涛. 基于位错密度理论的超高强双相钢DP1000热变形本构模型[J]. 材料研究学报, 2017, 31(8): 576-584.
Mei XU, Zhenli MI, Hui LI, Di TANG, Haitao JIANG. Constitutive Model Based on Dislocation Density Theory for Hot Deformation Behavior of Ultra-high Strength Dual Phase Steel DP1000[J]. Chinese Journal of Materials Research, 2017, 31(8): 576-584.

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摘要:

对超高强双相钢DP1000进行单道次热模拟压缩实验,研究了其在950~1150℃和0.05~10 s^-1条件下的热变形行为,分析了变形温度和变形速率对流变应力的影响,建立了基于位错密度理论的热力学本构模型,确定了可表征微观硬化和软化机制的材料特征参数,量化了加工硬化、动态回复和动态再结晶对宏观力学行为的影响。结果表明：超高强双相钢DP1000的热变形应变速率 $ε ˙$ ≤0.05 s^-1时以动态再结晶软化机制为主,应变速率 $ε ˙$ >0.1 s^-1时以动态回复软化机制为主,应变速率0.05 s^-1< $ε ˙$ ≤0.1 s^-1时由这两种软化机制共同作用。这个本构模型的预测值与实验值具有较高的一致性,能准确预测超高强双相钢DP1000在高温变形条件下的流变应力。

关键词 ：金属材料, 位错密度, 本构关系, 超高强双相钢, 动态再结晶, 临界应变

Abstract：

The compression deformation behavior of ultra-high strength dual phase steel (UHS-DP1000) was investigated by strain rates from 0.05 s^-1 to 10 s^-1 at temperatures from 950°C to 1150°C. The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Then a constitutive model for hot deformation of the steel UHS-DP1000 was established based on the dislocation density theory. The relevant softening mechanism of the steel was revealed in terms of the following two aspects that by low strain rates (lower than 0.05 s^-1) at high temperatures the dynamic recrystallization (DRX) softening mechanism was more evident, while by strain rates higher than 0.1 s^-1 the dynamic recovery (DRV) softening mechanism was dominant. The two softening mechanisms worked simultaneously by strain rates in a range between 0.05 s^-1 and 0.1 s^-1. The stress-strain values predicted by the present model for the steel UHS-DP1000 are well agreed with those acquired from experiments, which further confirmed that the established constitutive model could give an accurate estimate for the flow stress of high temperature deformation of the steel UHS-DP1000.

Key words： metallic materials dislocation density constitutive relationship ultra-high strength dual phase steel (UHS-DP1000) dynamic recrystallization critical strain

收稿日期: 2016-12-11

ZTFLH:

TG111

基金资助:国家自然科学基金(51371032)

作者简介:

作者简介徐梅,女,1983年生,博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.728 或 https://www.cjmr.org/CN/Y2017/V31/I8/576

图1 超高强双相钢DP1000不同变形条件下的流变应力曲线

表1 UHS-DP1000在不同变形条件下的软化机制

图2 UHS-DP1000在不同变形条件下应力与加工硬化率的关系

图3 在950℃、0.05 s-1变形条件下加工硬化率与应力和应变及其三次多项式拟合关系图

图4 基于θ-σ曲线和lnθ-ε曲线三次多项式拟合出的峰值应力与临界应力、峰值应变与临界应变的关系

表2 各工况下本构关系模型参数的计算值

Deformation temperature/°C	Strain rate/s^-1	Hot deformation constitutive model
1050~1150	≤0.1	$σ = σ sat 2 - σ sat 2 - σ 02 exp - rε 12, ε < ε c σ = σ p - F 2 exp a ε - ε p 2 + F 2, ε > ε c$ $σ sat = 1.042 × ε ˙ - 0.01566 exp 47460 RT$ $r = 75.84 × ε ˙ 0.1254 exp - 24380 RT$ $F 2 = 0.9203 × ε ˙ 0.1676 exp 51660 RT$ $a = - 9.785 × 106 × ε ˙ - 0.2707 exp - 132700 RT$
950~1050	≤0.05
1050~1150	>0.1	$σ = σ sat 2 - σ sat 2 - σ 02 exp - rε 12$ $σ sat = 4.333 × ε ˙ 0.1144 exp 28700 RT$ $r = 25.95 × ε ˙ 0.002238 exp - 12490 RT$
950~1050	>0.05

表3 不同工况下UHS-DP1000的本构关系

图5 不同变形条件下的预测流变应力值与实验值的比较

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