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首页> 外文期刊>Journal of Materials Engineering and Performance >A Simplified Micromechanical Modeling Approach to Predict the Tensile Flow Curve Behavior of Dual-Phase Steels
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A Simplified Micromechanical Modeling Approach to Predict the Tensile Flow Curve Behavior of Dual-Phase Steels

机译：一种简化的微机械建模方法来预测双相钢的拉伸流动曲线行为

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摘要

Micromechanical modeling is used to predict material's tensile flow curve behavior based on microstructural characteristics. This research develops a simplified micromechanical modeling approach for predicting flow curve behavior of dual-phase steels. The existing literature reports on two broad approaches for determining tensile flow curve of these steels. The modeling approach developed in this work attempts to overcome specific limitations of the existing two approaches. This approach combines dislocation-based strain-hardening method with rule of mixtures. In the first step of modeling, 'dislocation-based strain-hardening method' was employed to predict tensile behavior of individual phases of ferrite and martensite. In the second step, the individual flow curves were combined using 'rule of mixtures,' to obtain the composite dual-phase flow behavior. To check accuracy of proposed model, four distinct dual-phase microstructures comprising of different ferrite grain size, martensite fraction, and carbon content in martensite were processed by annealing experiments. The true stress-strain curves for various microstructures were predicted with the newly developed micromechanical model. The results of micromechanical model matched closely with those of actual tensile tests. Thus, this micromechanical modeling approach can be used to predict and optimize the tensile flow behavior of dual-phase steels.
机译：微机械建模用于预测基于微观结构特性的材料的拉伸流动曲线行为。该研究开发了一种简化的微机械建模方法，用于预测双相钢的流动曲线行为。现有的文献报告了两种广泛的方法来确定这些钢的拉伸流曲线。本工作中开发的建模方法试图克服现有两种方法的具体限制。这种方法结合了基于错位的应变硬化方法与混合物规则。在建模的第一步中，采用“基于脱位的应变硬化方法”来预测铁素体和马氏体各个阶段的拉伸行为。在第二步中，使用“混合物规则”组合各个流曲线，以获得复合双相流动行为。为了检查所提出的模型的精度，通过退火实验加工四种不同的铁氧体晶粒尺寸，马氏体分数和马氏体中的碳含量的不同的双相微结构。用新开发的微观机械模型预测了各种微结构的真正应力 - 应变曲线。微机械模型的结果与实际拉伸试验密切相关。因此，这种微机械建模方法可用于预测和优化双相钢的拉伸流动行为。

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