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首页> 外文期刊>Materials Science and Engineering >Evolution of twins and substructures during low strain rate hot deformation and contribution to dynamic recrystallization in alloy 617B
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Evolution of twins and substructures during low strain rate hot deformation and contribution to dynamic recrystallization in alloy 617B

机译：低应变速率热变形过程中孪晶和子结构的演化及其对合金617B动态再结晶的贡献

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摘要

Substructure and twin boundary evolution of alloy 617B during dynamic recrystallization (DRX) was investigated by optical microscope, electron backscatter diffraction (EBSD) and transmission electron microscope (TEM) technique. Simulated compression tests were carried out at different true strains in the temperature range of 1120-1210 ℃ with a strain rate of 0.001 s~(-1). The results show that discontinuous dynamic recrystallization (DDRX) featured by original grain boundary bulging is the dominant nudeation mechanism for alloy 617B. The progressive subgrain rotation, which is a characterization of continuous dynamic recrystallization (CDRX) can be detected at the early stage of hot deformation at lower temperature, which can just be considered as an assistant mechanism. The evolution of substructure and twin boundaries have a significant effect on DRX process of alloy 617B. Twinning formation can active the DRX process by accelerating original grain boundary bulging and separation of bulging grain boundaries. The formation of twin steps resulting from twin slipping provide additional DRX nucleation locations. The effort of twins gets weaker with the increase of temperature as the DRX grain growth process assodated with grain boundary area reduction gradually becomes a preferential mechanism for energy minimization. Different from previous study, the fraction of twin boundaries decrease with the increase of temperature, which can be attributed to the twin boundary accelerated prior grain growth process. Such process also results in the serious bulging of grain boundaries into adjacent grains.
机译：通过光学显微镜，电子背散射衍射（EBSD）和透射电子显微镜（TEM）技术研究了动态重结晶（DRX）过程中合金617B的亚结构和孪晶边界演化。在1120-1210℃的温度范围内，以不同的真实应变进行了模拟压缩试验，应变率为0.001 s〜（-1）。结果表明，以原始晶界凸起为特征的不连续动态再结晶（DDRX）是合金617B的主要裸晶机理。渐进的亚晶粒旋转是连续动态重结晶（CDRX）的特征，可以在较低温度下热变形的早期阶段检测到，这可以认为是辅助机制。亚结构和孪晶边界的演变对617B合金的DRX工艺有重要影响。孪晶形成可以通过加速原始晶界凸起和分离凸起晶界来激活DRX过程。由双滑引起的双台阶的形成提供了额外的DRX成核位置。随着温度升高，孪晶的作用变得越来越弱，因为随着晶界面积减小而逐渐消失的DRX晶粒生长过程逐渐成为能量最小化的优先机制。与先前的研究不同，孪晶边界的分数随着温度的升高而降低，这可以归因于孪晶边界加速了先前的晶粒生长过程。这种过程还导致晶界严重膨胀到相邻晶粒中。

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  • 来源
    《Materials Science and Engineering》 |2016年第1期|369-381|共13页
  • 作者

    He Jiang; Jianxin Dong; Maicang Zhang; Zhihao Yao;

  • 作者单位

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

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

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

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

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Nickel-based superalloy; DRX; Grain growth; Twin; Substructure;

    机译：镍基高温合金;DRX;谷物生长;双胞胎;子结构;

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