基于真实微观组织的双相钢力学行为多尺度模拟

Multi-scale modelling of mechanical behavior of dual-phase steels based on realistic microstructure

以两种不同化学成分和马氏体含量的双相钢为研究对象,对其显微组织进行了有限元建模。选取一部分显微组织作为代表性单元RVE来反映宏观材料特性,考虑合金成分和铁素体晶粒尺寸的影响,采用基于位错强化理论的Bailey-Hirsch模型描述铁素体和马氏体单相的流变行为,在ABAQUS中模拟了RVE的单向拉伸过程。结果表明,多尺度模型可以较好的预测宏观力学性能,并能合理的反映双相钢变形过程微观尺度的应力应变行为。

The finite element modelling for realistic microstructure was conducted for dual-phase steels containing different chemical components and martensite volume fractions.Macroscale materials properties were statistically represented by Representative Volume Element（RVE）based on selected microstructures.To describe the flow behavior of ferrite and martensite phases,a dislocation based Bailey-Hirsch model was used considering the effects of alloy components and grain sizes.The uniaxial tensile of RVE was simulated using ABAQUS software.Results show that the multi-scale model well predicts the macro mechanical behaviors of dual-phase steels,and reasonably reveals the inhomogeneous stress-strain development in micro-scale.