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首页> 外文期刊>Materials Science and Engineering >Micromechanical behavior of eutectoid steel quantified by an analytical model calibrated by in situ synchrotron-based X-ray diffraction
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Micromechanical behavior of eutectoid steel quantified by an analytical model calibrated by in situ synchrotron-based X-ray diffraction

机译：通过基于原位同步加速器的X射线衍射校准的分析模型量化共析钢的微力学行为

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摘要

A eutectoid steel with three types of ferrite (α)+cementite particle (θ) microstructures, i.e., a coarsegrained α+θ structure, a fine-grained α+θ structure and an ultrafine-grained α+θ structure, was fabricated to explore the effects of the microstructural features on the micromechanical behavior of hard particle-strengthened two-phase alloys. An analytical model based on the Kocks-Mecking model was established to elucidate the evolution of the geometrically necessary dislocations (GNDs) and statistically stored dislocations (SSDs) in the hard particle-strengthened alloys and, hence, to predict the stress partitioning for each phase and the enhancement in the work hardening during uniform plastic deformation. In situ synchrotron-based X-ray diffraction was used to verify the stress partitioning and the important material parameters predicted by our analytical model. Our results showed that a decrease in the geometric slip distance leads to an appreciable increase in the GND density, whereas an increase in the grain size of the ferrite causes an increase in the SSD density under uniform plastic deformation for eutectoid steel with an α+θ structure. Both the stresses for the individual phase and the difference in stress between the two phases for eutectoid steel with various α+θ structures were closely related to the change in the GND density near the phase interfaces. The GND density also played an important role in determining the work-hardening rate for eutectoid steel with various α+θ structures.
机译：制备了具有三种铁素体（α）+钙钛矿颗粒（θ）微观结构的共析钢，分别为粗晶α+θ结构，细晶α+θ结构和超细晶α+θ结构。微观结构特征对硬质颗粒强化两相合金微观力学行为的影响。建立了基于Kocks-Mecking模型的分析模型，以阐明硬质颗粒强化合金中几何必要位错（GND）和统计存储的位错（SSD）的演变，从而预测每个相的应力分配以及均匀塑性变形过程中工作硬化的增强。基于同步加速器的原位X射线衍射用于验证应力分配和我们的分析模型预测的重要材料参数。我们的结果表明，减小几何滑移距离会导致GND密度明显增加，而铁素体晶粒尺寸的增大会导致均匀塑性变形下α+θ的共析钢的SSD密度增加。结构体。对于具有各种α+θ结构的共析钢，单个相的应力以及两个相之间的应力差都与相界面附近GND密度的变化密切相关。 GND密度对于确定具有各种α+θ结构的共析钢的加工硬化率也起着重要作用。

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  • 来源
    《Materials Science and Engineering》 |2015年第17期|181-188|共8页
  • 作者

    Chengsi Zheng; Longfei Li; Yandong Wang; Wangyue Yang; Zuqing Sun;

  • 作者单位

    State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China,The Collaborative Innovation Center of Steel Technology (CICST), University of Science and Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China,The Collaborative Innovation Center of Steel Technology (CICST), University of Science and Technology Beijing, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science & Technology Beijing, Beijing 100083, China;

    State Key Laboratory for Advanced Metals and Materials, University of Science & Technology Beijing, Beijing 100083, China;

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  • 正文语种 eng
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  • 关键词

    Eutectoid steel with α+θ structure; Dislocation density; Analytical modeling; Micromechanical behavior; Work-hardening;

    机译：具有α+θ结构的共析钢;位错密度;分析建模;微观力学行为;工作硬化;

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