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首页> 外文期刊>Materials Science and Engineering >Physically based modeling and characterization of hot deformation behavior of twinning-induced plasticity steels bearing vanadium and niobium
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Physically based modeling and characterization of hot deformation behavior of twinning-induced plasticity steels bearing vanadium and niobium

机译：孪生诱发含钒和铌的可塑性钢热变形行为的基于物理的建模和表征

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摘要

In the present work, the hot deformation behavior of four TWIP steels is studied by conducting compression tests at the strain rates in the range 0.01-5/s and temperatures in the range 950-1100 ℃ using a Gleeble thermo-mechanical simulator. The four steels differed with respect to their chemical compositions. They were non-microalloyed, Nb-microalloyed, V-microalloyed and high-Al V-microalloyed. The microstructural evolutions are studied by a scanning electron microscope (SEM) equipped with electron backscattered diffraction (EBSD) detector. Also, the hot deformation behavior of the steels are modeled using the dislocation density based Bergstrom and the diffusional transformation based Kolmogorov-Johnson-Mehl-Avrami models. The peak stresses of the high-Al V-microalloyed variant occurred at higher strains than in the V-microalloyed variant. The microstructure of the Nb-microalloyed variant showed that dynamic recovery was more active than dynamic recrystallization (DRX) when the steel was deformed at lower temperatures, i.e. lower than 1000 ℃. Bergstrom modeling showed that as the Zener-Hollomon parameter (Z) increases, the hardening parameter for the V-microalloyed steel increases at a clearly higher rate than the others. Finally, it was seen that increased strain rate leads to decreased Avrami exponents (n_A) for the Nb-microalloyed and the high-Al V-microalloyed variants suggesting the occurrence of dynamic recrystallization (DRX) with nucleation on grain and twin boundaries.
机译：在目前的工作中，通过使用Gleeble热力机械模拟器在0.01-5 / s的应变率和950-1100℃的温度下进行压缩试验，研究了四种TWIP钢的热变形行为。四种钢的化学成分不同。它们是非微合金，Nb微合金，V微合金和高Al V微合金。通过配备电子背散射衍射（EBSD）检测器的扫描电子显微镜（SEM）研究了微观结构的演变。同样，使用基于位错密度的Bergstrom和基于扩散变换的Kolmogorov-Johnson-Mehl-Avrami模型对钢的热变形行为进行建模。高Al V型微合金化变体的峰值应力出现在比V型微合金化变体更高的应变下。 Nb-微合金变体的组织表明，当钢在较低温度（即低于1000℃）下变形时，动态恢复比动态再结晶（DRX）更活跃。 Bergstrom模型显示，随着齐纳-所洛门参数（Z）的增加，V型微合金钢的硬化参数以明显高于其他参数的速率增加。最后，可以看出，应变速率增加导致Nb微合金化和高Al V微合金化变体的Avrami指数（n_A）降低，表明发生了动态再结晶（DRX），并在晶粒和孪晶边界上形成了核。

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  • 来源
    《Materials Science and Engineering》 |2017年第4期|85-96|共12页
  • 作者

    Atef Hamada; Ali Khosravifard; David Porter; L. Pentti Karjalainen;

  • 作者单位

    Egypt-Japan University of Science and Technology E-JUST, P.O. Box 179, New Borg El-Arab City 21934, Alexandria, Egypt,Department of Metallurgical and Materials Engineering, School of Engineering, Shiraz Branch, I.A.U., Box 71993-1, Shiraz, Iran;

    Department of Metallurgical and Materials Engineering, School of Engineering, Shiraz Branch, I.A.U., Box 71993-1, Shiraz, Iran;

    Centre for Advanced Steels Research, University of Oulu, Box 4200, 90014 Oulu, Finland;

    Centre for Advanced Steels Research, University of Oulu, Box 4200, 90014 Oulu, Finland;

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  • 正文语种 eng
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  • 关键词

    TWIP steels; Physically based modeling; Hot deformation; EBSD; Recrystallization;

    机译：TWIP钢;基于物理的建模;热变形;EBSD;重结晶;

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