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首页> 外文期刊>Materials Science and Engineering >Strain rate dependence on the evolution of microstructure and deformation mechanism during nanoscale deformation in low carbon-high Mn TWIP steel
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Strain rate dependence on the evolution of microstructure and deformation mechanism during nanoscale deformation in low carbon-high Mn TWIP steel

机译：低碳-高锰TWIP钢纳米尺度变形过程中应变速率对组织演变的影响及变形机理

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摘要

We elucidate here the strain rate dependence on the deformation behavior and accompanying deformation mechanism in Fe-30Mn-0.3C TWIP steel via nanoscale deformation experiments and post-mortem microscopy of the deformed region. The nanoindentaion hardness increased with increased strain rate from 0.01 s(-1) to 1 s(-1), and exhibited a positive strain rate sensitivity of 0.095 with an activation volume of 18b(3). At a low strain rate, dislocations dominated the deformation behavior with a high density of 2.7 x 10(16) m(-2). With increased strain rate, the dislocations decreased and the stacking faults and nanotwins gradually increased. However, nanotwins with secondary twins were the dominant deformation process at high strain rate of 1 s(-1). The deformation behavior was significantly impacted by the interplay between strain rate, stacking fault energy and deformation mechanisms. A critical theoretical analysis suggested that the strain rate influenced the critical shear stress for twinning and dislocation slip, resulting in the change in deformation mechanism from dislocation slip to twinning.
机译：我们通过纳米级变形实验和事后显微观察，阐明了Fe-30Mn-0.3C TWIP钢中应变率与变形行为的关系及其伴随的变形机理。随着应变速率从0.01 s（-1）到1 s（-1）的增加，纳米吲哚阴离子硬度增加，并显示出0.095的正应变速率灵敏度，激活量为18b（3）。在低应变率下，位错以2.7 x 10（16）m（-2）的高密度主导变形行为。随着应变率的增加，位错减少，堆垛层错和纳米孪晶逐渐增加。但是，具有次级孪晶的纳米孪晶在1 s（-1）的高应变速率下是主要的变形过程。应变速率，堆垛层错能量和变形机制之间的相互作用对变形行为产生了显着影响。一项重要的理论分析表明，应变速率影响孪晶和位错滑移的临界剪切应力，从而导致变形机制从位错滑移变为孪生。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|116-123|共8页
  • 作者

    Li K.; Yu B.; Misra R. D. K.; Han G.; Tsai Y. T.; Shao C. W.; Shang C. J.; Yang J. R.; Zhang Z. F.;

  • 作者单位

    Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steels Res, 500 W Univ Ave, El Paso, TX 79968 USA;

    Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steels Res, 500 W Univ Ave, El Paso, TX 79968 USA;

    Univ Texas El Paso, Dept Met Mat & Biomed Engn, Lab Excellence Adv Steels Res, 500 W Univ Ave, El Paso, TX 79968 USA;

    Univ Sci & Technol Beijing, Beijing 100083, Peoples R China;

    Natl Taiwan Univ, Dept Mat Sci & Engn, 1 Roosevelt Rd, Taipei 106, Taiwan;

    Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China;

    Univ Sci & Technol Beijing, Beijing 100083, Peoples R China;

    Natl Taiwan Univ, Dept Mat Sci & Engn, 1 Roosevelt Rd, Taipei 106, Taiwan;

    Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Engineering steel; Deformation behavior; Microstructure evolution, strain rate;

    机译：工程钢;变形行为;组织演变;应变率;

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