| 热轧双相钢微观应力-应变模型 |
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| 作者姓名： | 庞启航 唐荻 赵征志 |
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| 作者单位： | 北京科技大学冶金工程研究院, 北京 100083 |
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| 摘 要： | 利用扫描电子显微镜和透射电子显微镜对热轧后双相钢的微观组织进行分析,用Image-Pro Plus软件测定双相钢微观组织中各独立相的体积分数.根据多相材料中间混合法则和Swift方程,建立热轧双相钢微观应力-应变模型,并用DP590和DP780钢单向拉伸曲线进行验证.结果表明,该应力-应变关系微观模型基本阐明热轧双相钢微观组织参数与宏观力学性能的内在联系,能够准确地描述材料的变形行为,同时很好地预测热轧双相钢宏观的拉伸曲线.
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| 关 键 词： | 双相钢 微观组织 应力-应变关系 数学模型 Swift方程 |
| 收稿时间： | 2014-08-05 |
Microstructure-based model for the stress-strain relationship of hot-rolled dual-phase steel |
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| Affiliation: | Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | The microstructure of hot-rolled dual-phase steel was studied by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The volume fraction of each phase in the dual-phase steel was determined by Image-Pro Plus software. A microstructure-based model was deduced for the stress-strain relationship of the dual-phase steel according to the mixing rule of multiphase materials and the Swift equation. Then the model was verified by the strain-stress curves of DP590 and DP780 steels obtained from uniaxial tensile testing. The results show that the model expounds the relationship between the microstructural parameters and macroscopic mechanical properties,and it is able to accurately describe the deformation behavior of materials and well predict the tensile curve of hot rolled dual-phase steel. |
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