基于3D模拟的双相钢中组元相间变形协调性

doi:10.3901/JME.2020.12.085

摘要/Abstract

摘要： 双相金属材料通常可以兼顾两相的优点，但由于两相性能的异质性，使两相的变形不协调，受力状态及变形特征较为复杂。基于代表体元法（Representative volume element，RVE）构建奥氏体+铁素体双相钢3D仿真模型，进行不同两相比例压缩变形的数值模拟，分析变形协调特性，讨论组元相微观性能与双相钢宏观性能间的关联规律。结果表明，两相的相内应力、应变分布不均，其中等效塑性应变呈正态分布，而等效应力则呈负偏态分布。在初始变形阶段，两相间表现出显著的变形不协调性；随变形量的增加，两相间的变形协调性得到改善并趋于稳定。两相的塑性应变与宏观应变基本满足线性关系，两相应变增量分别与宏观应变增量之差的比值为一个与相比例相关的定值。引入与两相相比例相关的应变配分参数K，建立基于广义体积分数的应变混合公式，可更加准确地表征复相材料组元相应变与宏观应变间的关联规律，为分析复相材料相间变形协调行为提供理论支持。

关键词: 双相钢, 组元, 变形协调性, 应变配分, 代表体元法

Abstract: Advanced metal materials with two constituent phases usually take advantage of the characteristics of two phases. However, uncoordinated deformation always exists between two phases due to the differences in the properties of each other, and meanwhile, the stress state and deformation characteristics are more complicated. Based on the representative volume element (RVE), a 3D model is constructed and austenite and ferrite distributed randomly in units via a program. Numerical simulations of different comparative phases are carried out, and the deformation coordination are analyzed. The deformation characteristics of individual phase between two constituent phases are discussed in order to clarify the mechanical response in macro-and micro-scale. The results show that both stress and strain distribution in individual phase are uneven. The equivalent plastic strain shows a Gaussian distribution, while the equivalent stress distributes in the negative skewness. In initial deformation stage, the deformation coordination between the two phases is unsatisfactory. As the deformation increases, the deformation coordination between both phases is improved and gradually tends to be stable. In approximately, a linear relationship is shown between the plastic strain in each individual phase and the macroscopic strain. The ratio of strain increment difference between each individual phase and overall duplex steel shows a phase fraction-dependent constant value. The strain distribution parameter K associated with the phase fraction is introduced, whereby the mixed law of strain based on the generalized phase fraction is established to modify classic strain mixing theory. It can more accurately characterize the correlation of composite materials between the change of component and the macroscopic strain, and provide theoretical support for analyzing the coordinated behavior of phase-to-phase deformation of composite materials.

Key words: duplex steel, constituent, coordination of deformation, strain partitioning, representative volume element

中图分类号:

TG142

金淼, 张文彬, 张庆玲, 贾祺祥, 郭宝峰, 陈雷. 基于3D模拟的双相钢中组元相间变形协调性[J]. 机械工程学报, 2020, 56(12): 85-91.

JIN Miao, ZHANG Wenbin, ZHANG Qingling, JIA Qixiang, GUO Baofeng, CHEN Lei. Deformation Coordination between Component Phases in Duplex Steel Based on 3D Simulation[J]. Journal of Mechanical Engineering, 2020, 56(12): 85-91.

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