Characterization of hot deformation behavior of as-cast TC21 titanium alloy using processing map
Characterization of hot deformation behavior of as-cast TC21 titanium alloy using processing map
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利用加工图表征铸态 TC21 钛合金的热变形行为
DOI：
10.1016/j.msea.2010.11.015
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发表时间：
2011-01
期刊：
影响因子：
6.4
通讯作者：
Zhou, Yigang
中科院分区：
文献类型：
--
作者：
Zhu, Yanchun;Zeng, Weidong;Feng, Fei;Sun, Yu;Han, Yuanfei;Zhou, Yigang
使用变形温度范围为 1000°C 至 1150°C、应变速率范围为 0.01 至 10s−1、高度减少量为 60% 的加工图，研究了铸态 TC21 钛合金的等温压缩热变形行为。将铸态TC21合金的本构方程建立为指数定律形式，计算出变形活化能约为185.51kJ/mol。基于动态材料模型和Prasad不稳定准则，构建了铸态TC21钛合金在应变为0.4和0.6时的加工图。通过微观结构观察验证了稳定区和不稳定区的变形机制。这些图呈现出温度范围为1000-1150°C、应变速率范围为0.01-0.1s−1的稳定域，并具有两个功率耗散效率峰值，一个是48%出现在1000°C/0.01s-1，与动态恢复相关，另一个是38%出现在1150°C/0.01s-1，显示出连续再结晶的特征。因此，该合金的最佳加工条件为1150℃/0.01s−1。此外，材料在高于1s−1的应变速率下会发生流动局部化，在热加工中必须避免这种现象，以获得令人满意的性能。因此，铸态 TC21 合金适用的齿槽温度和齿槽应变率分别为 1000–1150°C 和 0.01–0.5s−1。
The hot deformation behavior of as-cast TC21 titanium alloy has been investigated in the isothermal compression of the alloy using processing maps conducted at the deformation temperature ranging from 1000°C to 1150°C, the strain rate ranging from 0.01 to 10s−1, and the height reduction of 60%. The constitutive equation of as-cast TC21 alloy is developed in the form of the exponential law and the deformation activation energy is calculated to be about 185.51kJ/mol. Based on the dynamic materials model and Prasad's instability criterion, the processing maps of as-cast TC21 titanium alloy are constructed at strains of 0.4 and 0.6. Deformation mechanisms in the stable and unstable regions are verified through the microstructure observation. The maps exhibit a stable domain with the temperature range of 1000–1150°C and strain rate range of 0.01–0.1s−1with two peak efficiencies of power dissipation, one is 48% occurring at 1000°C/0.01s−1that is associated with dynamic recovery, the other is 38% occurring at 1150°C/0.01s−1, which displays the feature of continuous recrystallization. Therefore, the optimal processing condition of the alloy is 1150°C/0.01s−1. In addition, the material undergoes flow localization at strain rates higher than 1s−1which has to be avoided in hot processing for obtaining satisfactory properties. Thus the applicable cogging temperatures and cogging strain rates for as-cast TC21 alloy are 1000–1150°C and 0.01–0.5s−1, respectively.
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影响因子：
8.4
作者：
Li, A. B.;Huang, L. J.;Cui, X. P.
通讯作者：
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影响因子：
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影响因子：
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