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Study on constitutive relationships and processing maps for FGH96 alloy during two-pass hot deformation

机译：FGH96合金二次通过热变形本构关系及加工图研究

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摘要

The processing maps of FGH96 alloy with different strains have been investigated by isothermal interrupted hot compression test within the temperature range of 1050-1125℃, the strain rate of 0.001-0.1 s~(-1) and the strain was 45+45%. The constitutive relationships which include the strain, strain rate and temperature were established and the microstructures of the first-pass and second-pass hot deformation were observed. The result showed that the dynamic recrystallization has occurred under different conditions. The first-pass hot deformation had a great influence on the flow stress of the second-pass. The curves of true stress-true strain between mathematical models and measured value were preferably fitted. The mathematical models could reflect the flow stress precisely under different conditions. Two instability zones of flow behavior were respectively established as follows: T=1080-1125℃, ε' = 0.01-0.1 s~(-1), ε＜0.2 and T=1050-1125℃, ε' = 0.001 s~(-1), ε> 1, which should be avoided during hot deformation. When power dissipation rate decreased as strain increased, the recrystallization grain coarsening happened. Otherwise, the recrystallization grain would be refined.
机译：通过等温间断热压缩试验，在1050-1125℃的温度范围内，应变率为0.001-0.1 s〜（-1），应变为45 + 45％，研究了不同应变的FGH96合金的加工图。建立了包括应变，应变速率和温度在内的本构关系，并观察了第一遍和第二遍热变形的显微组织。结果表明，在不同条件下都发生了动态再结晶。第一遍的热变形对第二遍的流动应力有很大的影响。优选拟合数学模型与测量值之间的真实应力-真实应变的曲线。数学模型可以准确反映不同条件下的流动应力。分别建立了两个流动特性失稳区，分别为：T = 1080-1125℃，ε'= 0.01-0.1 s〜（-1），ε＜0.2，T = 1050-1125℃，ε'= 0.001 s〜（ -1），ε> 1，在热变形期间应避免。当功率耗散率随着应变的增加而降低时，发生了再结晶晶粒的粗化。否则，将细化重结晶晶粒。

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  • 来源
    《Materials Science and Engineering》 |2014年第10期|255-261|共7页
  • 作者

    Bin Fang; Zhen Ji; Meng Liu; Gaofeng Tian; Chengchang Jia; Tiantianx Zeng; Benfu HU; Congcong Wang;

  • 作者单位

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    Beijing Institute of Aeronautical Materials, Beijing 100095, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

    School of Materials Science and Engineering, University of Science and Technology Beijing, XueYuan Road 30, Beijing 100083, China;

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

    FCH96 alloy; Two-pass hot deformation; Constitutive relationship; Processing map;

    机译：FCH96合金;两遍热变形;本构关系;加工图;

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