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Experimental investigations and constitutive modeling of the dynamic recrystallization behavior of Inconel 740 superalloy

机译：Inconel 740超合金动态再结晶行为的实验研究与组成型建模

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摘要

The dynamic recrystallization (DRX) behavior of Inconel 740 superalloy was investigated via the isothermal compression tests and constitutive modeling. The unified constitutive model involving the flow behavior and the microstructural evolution was developed for modeling the DRX behavior via considering the critical strain of DRX initiation, DRX grain nucleation rate and DRX grain size. The results show that the variations of flow stress, grain size and DRX fraction during hot deformation are well described at the constant strain rate. The strain hardening behavior is also well predicted under the deformation conditions outside the calibration range of this model. Moreover, the complex hot deformation characteristics are also well predicted and estimated in the transient deformation process caused by the strain rate jump. The developed model is validated by the experimental results. Furthermore, the DRX diagram in the optimum hot-workability temperature range of Inconel 740 superalloy is established to visualize the DRX kinetics. This work provides a basis for understanding of the flow behavior and microstructural evolution of Inconel 740 superalloy and helps process determination and quality assurance in hot working of this superalloy.
机译：通过等温压缩试验和本构型建模研究了Inconel 740超合金的动态再结晶（DRX）行为。开发了涉及流动行为和微观结构演化的统一结构型模型，用于通过考虑DRX启动，DRX晶粒成核率和DRX晶粒尺寸的临界应变来模拟DRX行为。结果表明，在热变形期间的流量应力，粒度和DRX部分的变化很好地以恒定的应变速率良好地描述。在该模型的校准范围之外的变形条件下，应变硬化行为也很好地预测。此外，复杂的热变形特性也在应变速率跳跃引起的瞬态变形过程中预测和估计。通过实验结果验证开发的模型。此外，建立了Inconel 740超合金的最佳热可加工性温度范围的DRX图以可视化DRX动力学。这项工作为理解Inconel 740高温合金的流动行为和微观结构演化提供了基础，并有助于在该超合金的热处理过程中进行过程确定和质量保证。

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  • 来源
    《Materials Science and Engineering》 |2020年第19期|139939.1-139939.13|共13页
  • 作者

    Mingjia Wang; Chaoyang Sun; M.W. Fu; Zhongli Liu; Chunhui Wang;

  • 作者单位

    chool of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Lightweight Metal Forming Beijing 100083 China;

    chool of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Lightweight Metal Forming Beijing 100083 China;

    Department of Mechanical Engineering The Hong Kong Polytechnic University Hung Horn Kowloon Hong Kong China;

    School of Nuclear Equipment and Nuclear Engineering Yantai University Yantai 264005 China;

    chool of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of Lightweight Metal Forming Beijing 100083 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Dynamic recrystallization; Hot deformation behavior; Constitutive model; Dynamic recrystallization diagram; Inconel 740 superalloy;

    机译：动态再结晶;热变形行为;本构模型;动态再结晶图;Inconel 740超级合金;

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