Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process.
Effect of Equal Channel Angular Pressing on the Dynamic Softening Behavior of Ti-6Al-4V Alloy in the Hot Deformation Process.
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DOI：
10.3390/ma14010232
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发表时间：
2021-01-05
期刊：
影响因子：
--
通讯作者：
Hou H
中科院分区：
文献类型：
--
作者：
Zhao Z;Gao J;Wang Y;Zhang Y;Hou H
为了研究等通道转角挤压（ECAP）对Ti-6Al-4V合金高温变形的影响，对两种不同初始组织的合金（原始合金（Pre-ECAP）和ECAP变形后的合金（Post-ECAP））进行了热压缩试验。ECAP后，由于合金晶粒细化和变形能提高，合金在热变形过程中表现出较高的动态软化程度。在500 °C时，Post-ECAP合金的流变应力高于Pre-ECAP合金。然而，随着温度和应变速率的增加，Post-ECAP合金的应力迅速下降，直到700 °C时的应力值远低于Pre-ECAP合金。动态软化系数的测定结果表明，在热压缩变形过程中，Post-ECAP的动态软化行为比Pre-ECAP更为明显。Pre-ECAP变形的主要动态软化机制是动态回复，而Post-ECAP变形的主要机制是动态再结晶。微观组织观察结果表明，在相同变形条件下，Post-ECAP变形后合金更容易发生动态再结晶。在700 °C、应变速率为ECAP后合金的晶粒进一步细化。由于其显著的动态再结晶，Post-ECAP合金在高于600 °C的温度下表现出更好的塑性变形。
To investigate the effect of equal channel angular pressing (ECAP) on the deformation of Ti-6Al-4V alloy at a higher temperature, hot compression tests were conducted on alloys having two different initial microstructures (the original alloy (Pre-ECAP) and ECAP-deformed alloy (Post-ECAP)). Post-ECAP, the alloy showed a higher degree of dynamic softening during the hot deformation process due to its finer grain size and higher distortion energy. The flow stress of Post-ECAP alloy was higher than the Pre-ECAP alloy at 500 °C when . However, the stress of the Post-ECAP alloy decreased rapidly with increasing temperature and strain rate, until the stress value was much lower than that of Pre-ECAP at 700 °C when . The value of the dynamic softening coefficient revealed that the dynamic softening behavior of Post-ECAP was more pronounced than that of Pre-ECAP in the hot compression deformation process. The main dynamic softening mechanism of Pre-ECAP is dynamic recovery, while the dynamic recrystallization process plays a more important role in the deformation process of Post-ECAP alloy. The microstructures observation results showed that dynamic recrystallization was more likely to occur to Post-ECAP alloys under the same deformation condition. Almost fully dynamic recrystallization had occurred in the deformation process of Post-ECAP at 700 °C and a strain rate of . The grains of Post-ECAP alloys were further refined. The Post-ECAP alloy exhibits better plastic deformation at temperatures higher than 600 °C due to its significant dynamic recrystallization.
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DOI：
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发表时间：
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影响因子：
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