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arXiv 2203.08447cond-mat.mtrl-scics.CE
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初始组织对Al_2O_3 -4合金热成形再结晶影响的表征与模拟

Characterization and modeling of the influence of initial microstructure on recrystallization of zircaloy-4 during hot forming

Victor Grand, Baptiste Flipon, Alexis Gaillac, Marc Bernacki

摘要:

本文通过实验和数值模拟手段,对热成形条件下的4号镍基合金再结晶过程进行了详细的研究。热机械测试和表征运动,已被必要的这项工作进行了说明。然后,从最简单的到最复杂的,不同的组织演变机制进行了表征。对晶粒长大动力学进行了定量分析,并分析了第二相粒子数对晶粒长大的影响。然后,提供了一个完整的研究动态和后动态再结晶。连续机制的发生被确认和热机械条件后再结晶的影响进行评估。随后,提出了用于模拟晶粒长大、连续再结晶和后动态再结晶的数值框架。在成功地再现了有和没有第二相粒子的晶粒粗化动力学后,该模型被用来描述从初始等轴和完全再结晶的显微组织的连续动态再结晶和后动态再结晶。实验和数值计算结果之间的协议进行了详细评估。最后,模拟后动态再结晶,从两个变形的组织特征的电子背散射衍射技术和沉浸在模拟。这允许讨论和再现初始微观结构的影响。

英文摘要:

The present article proposes a detailed study of recrystallization of zircaloy-4 under hot forming conditions by means of experimental and numerical tools. Thermomechanical tests and characterization campaigns that have been necessary for this work are described. Then, the different microstructure evolution mechanisms are characterized, from the simplest one to the most complex. Grain growth kinetics is quantified and the influence of second phase particle population is analyzed. Then, a complete study of dynamic and post-dynamic recrystallization is provided. The occurrence of a continuous mechanism is confirmed and the influence of thermomechanical conditions upon recrystallization is assessed. Later, the numerical framework used to simulate grain growth, continuous and post-dynamic recrystallization is presented. After having successfully reproduced the grain coarsening kinetics with and without second phase particles, the model is used to describe continuous dynamic recrystallization and post-dynamic recrystallization from an initial equiaxed and fully recrystallized microstructure. The agreement between experimental and numerical results is assessed in detail. Finally, post-dynamic recrystallization is simulated, starting from two deformed microstructures characterized by electron back-scattered diffraction technique and immersed into simulations. This allows to discuss and reproduce the influence of initial microstructure.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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