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首页> 外文期刊>Materials Science and Engineering >In-situ bending under tension shear fracture analysis and microstructure 'earthquake' of DP780 dual phase steels
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In-situ bending under tension shear fracture analysis and microstructure 'earthquake' of DP780 dual phase steels

机译：DP780双相钢在拉伸剪切断裂下的原位弯曲及组织“地震”

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摘要

Dual phase (DP) steels consist of hard brittle martensite phase and soft ductile ferrite phase. With a novel bending under tension test system, in-situ symmetrical bending under tension experiments were carried out and photomicrographs of bending surface were recorded. The microstructure "earthquake" of DP780 dual phase steels was observed in the bending under tension process. By analyzing the in-situ images serious, the initiation, coalescence of cavities and propagation of micro-cracks until final fracture were analyzed. The micro-cracks form only in the outside surface of bending radius, and mainly appear near the phase boundary of ferrite and martensite. Micro-cracks coalesce and propagate in the direction perpendicular to the stretching direction approximately, and at the phase boundary of martensite and ferrite. Furthermore, digital image correlation technology was used in this study to analysis the strain distribution between ferrite and martensite during the bending under tension deformation and fracture.
机译：双相（DP）钢由硬质脆性马氏体相和软质延性铁素体相组成。利用一种新型的拉伸试验弯曲系统，进行了拉伸试验的原位对称弯曲实验，并记录了弯曲表面的显微照片。在拉伸过程中弯曲时观察到DP780双相钢的微观结构“地震”。通过分析严重的原位图像，分析了空洞的形成，合并和微裂纹的传播直至最终破裂。微裂纹仅在弯曲半径的外表面形成，并且主要出现在铁素体和马氏体的相界附近。微裂纹在马氏体和铁素体的相界处大约在垂直于拉伸方向的方向上聚结并传播。此外，本研究采用数字图像相关技术分析了在拉伸变形和断裂时弯曲过程中铁素体与马氏体之间的应变分布。

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  • 来源
    《Materials Science and Engineering》 |2017年第may17期|80-91|共12页
  • 作者

    Yixi Zhao; Sheng Huang; Wenjiao Dan; Weigang Zhang; Shuhui Li;

  • 作者单位

    State Key Laboratory of Mechanical System and Vibration, Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Mechanical System and Vibration, Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Innovation Center for Advanced Ship and Deep-Sea Exploration, Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    Innovation Center for Advanced Ship and Deep-Sea Exploration, Department of Engineering Mechanics, Shanghai Jiao Tong University, Shanghai 200240, PR China;

    State Key Laboratory of Mechanical System and Vibration, Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiao Tong University, Shanghai 200240, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dual phase steels; In-situ; Bending under tension; Microstructure evolution; Digital image correlation;

    机译：双相钢;原位在张力下弯曲;微观组织演变;数字图像关联;

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