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首页> 外文期刊>Materials Science and Engineering >A dislocation density-based model and processing maps of Ti-55511 alloy with bimodal microstructures during hot compression in α+β region
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A dislocation density-based model and processing maps of Ti-55511 alloy with bimodal microstructures during hot compression in α+β region

机译：α+β区域热压缩期间Ti-55511合金基于脱位密度的模型和加工映射

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摘要

Hot compression features of Ti-55511 alloy are investigated by high-temperature compression tests in a+p region. It is found that the flow stress and softening mechanisms are obviously influenced by deformation conditions. The true stress decreases with the reduced strain rate or the raised temperature. The spheroidization of a phase and dynamic recrystallization (DRX) of p phase easily occur at low temperatures such as 973, 1003 and 1033 K, while the dynamic recovery (DRV) of p phase mainly occurs at high temperatures such as 1063 K because of the transformation from a phase to p phase at relatively high temperatures A dislocation density-based constitutive model, which is associated with DRV, work hardening mechanisms and the spheroidization of a phases, is established and validated to describe flow behavior. The correlation coefficient (R) and average absolute relative error (AARE) of the established model are 0.9924 and 6.8%, respectively. 3D power dissipation efficiency maps and processing maps are established to determine the appropriate processing window, i.e., too low temperatures (lower than 973 K) or too high strain rates (higher than 1 s~(-1)) easily induce flow instability. Therefore, the medium temperature (1003-1063 K) and the low strain rate (0.001-0.1 s~(-1)) are applicable for thermal compression of the studied titanium alloy.
机译：通过A + P区域的高温压缩试验研究了TI-55511合金的热压缩特征。结果发现，流量应力和软化机制明显受变形条件的影响。真正的应力随着应变速率降低或凸起的温度而降低。 P阶段的相位和动态再结晶（DRX）的球化和动态再结晶（DRX）在诸如973,1003和1033k的低温下容易发生，而P阶段的动态恢复（DRV）主要发生在诸如1063k的高温下，因为从相对较高的温度从相位转换到P相位，建立和验证与DRV，工作硬化机构和相位的球形相关的基于位错的本构体型模型以描述流动行为。建立模型的相关系数（R）和平均绝对相对误差（AARE）分别为0.9924和6.8％。建立3D功耗效率图和处理地图以确定适当的处理窗口，即过低的温度（低于973 k）或过高的应变率（高于1 s〜（-1））容易引起流动不稳定。因此，培养基温度（1003-1063 k）和低应变率（0.001-0.1S〜（-1））适用于所研究的钛合金的热压缩。

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  • 来源
    《Materials Science and Engineering》 |2020年第jul14期|139692.1-139692.9|共9页
  • 作者

    Yi-Wei Xiao; Y.C. Lin; Yu-Qiang Jiang; Xiao-Yong Zhang; Guo-Dong Pang; Dan Wang; Ke-Chao Zhou;

  • 作者单位

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

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

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

    State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China;

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

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

    State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Titanium alloy; Flow stress; Softening mechanisms; Constitutive model; Processing maps;

    机译：钛合金;流量压力;软化机制;本构模型;处理地图;

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