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首页> 外文期刊>Journal of Materials Research >The dynamic recrystallization evolution and kinetics of Ni-18.3Cr-6.4Co-5.9W-4Mo-2.19Al-1.16Ti superalloy during hot deformation
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The dynamic recrystallization evolution and kinetics of Ni-18.3Cr-6.4Co-5.9W-4Mo-2.19Al-1.16Ti superalloy during hot deformation

机译：Ni-18.3Cr-6.4Co-5.9W-4Mo-2.19Al-1.16Ti高温热变形过程中的动态再结晶演化和动力学

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摘要

The dynamic recrystallization (DRX) behavior of Ni-18.3Cr-6.4Co-5.9W-4Mo-2.19Al-l.16Ti superalloy was investigated by means of isothermal compression tests in the temperature range of 1010-1160 ℃ and strain rate range of 0.001-1 s~(-1). It was found that the nucleation mechanisms of discontinuous DRX and continuous DRX (CDRX) occurred simultaneously during hot deformation, and twinning can play an important role in improving the process of DRX. There are three stages in the process of CDRX, i.e., the accumulation and rearrangement of dislocations, the formation of subgrain boundary, and the conversion to high angle grain boundaries (HAGBs) from subgrain boundary. Moreover, the effect of CDRX grows weaker with increasing deformation temperature and decreasing strain rate. Additionally, both the volume fraction of DRX grains and the DRX grain size were closely related to the deformation temperature and strain rate, and a power exponent relationship between the DRX grain size and Z parameter was obtained. Based on the experimental data, the kinetic equations were also developed to evaluate the volume fraction of DRX grains during hot deformation in the alloy.
机译：通过等温压缩试验，研究了Ni-18.3Cr-6.4Co-5.9W-4Mo-2.19Al-1.16Ti高温合金在1010-1160℃和应变速率范围内的动态再结晶行为。 0.001-1 s〜（-1）。研究发现，不连续DRX和连续DRX（CDRX）的成核机理在热变形过程中同时发生，而孪晶在改善DRX的过程中起着重要的作用。 CDRX的过程分为三个阶段，即位错的积累和重排，亚晶界的形成以及从亚晶界到高角度晶界（HAGB）的转变。而且，随着变形温度的升高和应变速率的降低，CDRX的作用减弱。另外，DRX晶粒的体积分数和DRX晶粒尺寸均与变形温度和应变速率密切相关，并且获得了DRX晶粒尺寸与Z参数之间的幂指数关系。根据实验数据，还建立了动力学方程，以评估合金热变形过程中DRX晶粒的体积分数。

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  • 来源
    《Journal of Materials Research》 |2015年第7期|1029-1041|共13页
  • 作者

    Hongbin Zhang; Kaifeng Zhang; Shaosong Jiang; Zhen Lu;

  • 作者单位

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;

    School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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