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A unified physically based constitutive model for describing strain hardening effect and dynamic recovery behavior of a Ni-based superalloy

机译:用于描述镍基高温合金的应变硬化效应和动态恢复行为的基于物理的统一本构模型

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摘要

The strain hardening effect and dynamic recovery behavior of a Ni-based superalloy are studied by isothermal compressive tests. A new unified dislocation-density based constitutive model is developed to characterize the strain hardening effect and dynamic recovery behavior of the studied superalloy. In the developed constitutive model, some material parameters (yield stress, strain hardening coefficient, and dynamic recovery coefficient) are assumed as functions of initial grain size, deformation temperature, and strain rate. An iterative algorithm is designed to predict the high-temperature deformation behaviors under time-variant hot working conditions. The hot deformation parameters and material parameters can be updated in each strain increment. Comparisons between the experimental and calculated flow stresses indicate that the developed constitutive model can accurately describe the high-temperature deformation behavior of the studied superalloy. Furthermore, the developed constitutive model is also successfully used for analyzing time-variant hot working processes.
机译:通过等温压缩试验研究了镍基高温合金的应变硬化效应和动态恢复行为。建立了新的基于位错密度的本构模型,以表征所研究高温合金的应变硬化效应和动态恢复行为。在发展的本构模型中,假定某些材料参数(屈服应力,应变硬化系数和动态恢复系数)是初始晶粒尺寸,变形温度和应变速率的函数。设计了一种迭代算法来预测时变热加工条件下的高温变形行为。可以在每个应变增量中更新热变形参数和材料参数。实验和计算的流应力之间的比较表明,建立的本构模型可以准确地描述所研究的高温合金的高温变形行为。此外,开发的本构模型也成功地用于分析时变热加工过程。

著录项

  • 来源
    《Journal of Materials Research》 |2015年第24期|3784-3794|共11页
  • 作者单位

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China Light Alloy Research Institute of Central South University, Changsha 410083, Hunan Province, China and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China Light Alloy Research Institute of Central South University, Changsha 410083, Hunan Province, China and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, Hunan Province, China and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, Hunan Province, China;

    School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, Henan Province, 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);
  • 原文格式 PDF
  • 正文语种 eng
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