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Refinement of the Ti-17 microstructure after hot deformation: Coupled mesoscale model

机译：热变形后Ti-17微观结构的改进：耦合Messcale模型

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摘要

The thermo-mechanical processing of Ti-alloys comprises several steps where complex deformation and temperature cycles are achieved. In this work, the static recrystallization behaviour of a Ti-17 alloy is investigated using ex-situ characterization and in-situ synchrotron radiation experiments aiming to understand the operating mechanisms and to establish the recrystallization kinetics. Hot compression in the β- field for different strain rates is applied to provide different initial microstructures before isothermal heat treatments and continuous cooling. Strain induced boundary migration is the main operating nucleation mechanism during static recrystallization. A simple mesoscale model is proposed to couple the evolution of the microstructure during hot deformation followed by annealing considering the heterogeneity of deformation within the β-grains, for the nucleation and growth of grains and the formation of the substructure by static recovery. Electron backscattered diffraction measurements are used after isothermal annealing and continuous cooling treatments to validate the model. A strong influence of the localization of deformation in the vicinity of the prior β-high angle grain boundaries is observed and empirically implemented in the mesoscale model. The strong influence of the temperature is attributed to the difference in high angle grain boundary mobility during static recrystallization. Grain refinement is not successfully achieved up to the investigated strain due to the insufficient nucleation rate with respect to the growth rate. However, a homogenous recrystallized microstructure is observed. The model can predict the microstructure for any starting microstructure, even beyond the experimental validation.
机译：Ti-合金的热机械加工包括达到复杂变形和温度循环的几个步骤。在这项工作中，使用旨在理解操作机制和建立重结晶动力学的原位表征和原位同步辐射实验来研究Ti-17合金的静态再结晶行为。应用不同应变率的β-场的热压缩以在等温热处理和连续冷却之前提供不同的初始微结构。应变诱导的边界迁移是静态再结晶期间的主要工作成核机理。提出了一种简单的介质模型，以耦合在热变形期间微观结构的演化，然后考虑β-颗粒内变形的异质性，用于通过静态回收来形成晶粒的成核和生长和亚结构的形成。在等温退火和连续冷却处理后使用电子背散射衍射测量以验证模型。观察到在先前β-高角度晶界附近的变形定位的强烈影响，并在Messcale模型中凭经验实施。温度的强烈影响归因于静态再结晶期间的高角度晶界移动性的差异。由于对生长速率的成核速率不足，谷物细化未成功地达到调查的菌株。然而，观察到均匀的再结晶微观结构。该模型可以预测任何起始微结构的微观结构，即使超出实验验证。

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