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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Visco-plastic self-consistent modeling of crystallographic texture evolution related to slip systems activated during machining Ti-6AL-4V
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Visco-plastic self-consistent modeling of crystallographic texture evolution related to slip systems activated during machining Ti-6AL-4V

机译：粘塑塑料自一致建模晶体纹理进化与加工Ti-6AL-4V激活的滑动系统相关

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摘要

Exploring the interconnection between texture variation and the activations of slip systems is vital for the texture generation and controlling during machining of Ti-6AL-4V. The evolution of crystallographic texture and the activations of different slip systems during machining of Ti-6AL-4V were studied combined with the orientation imaging microscopy (OIM) and visco-plastic self-consistent (VPSC) framework. A VPSC model considering the activations of five slip families as well as twinning of hexagonal close packed (HCP) Ti structure and coupled with a finite element cutting simulation model were used to simulate the texture variations during machining of Ti-6AL-4V. Crystallographic texture evolutions of Ti-6AL-4V in chips and machined surface were examined using OIM. Two initial textures of Ti-6AL-4V yielded the same end texture, a strong C fiber texture. Lastly, Voce hardening parameters were modified to control the activations of slip modes as well as twinning and calibrate the VPSC simulation results of texture and mechanical property. It is found that the combination of prismatic , basal , pyramidal and 2-nd order pyramidal slip systems induce the generation of C shear texture in machining of Ti-6AL-4V. The activation of 2-nd order slip system makes large contribution to the formation of C shear texture irrespective of the initial textures and machining parameters. The result demonstrates that activations of slip systems and their relative activities depend on the shear deformation in machining of Ti-6AL-4V. This finding is important to control the texture variation in the deformation of Ti-6AL-4V. (C) 2020 Elsevier B.V. All rights reserved.
机译：探索织构变化与滑移系统激活之间的相互联系对于Ti-6AL-4V加工过程中织构的生成和控制至关重要。结合取向成像显微镜（OIM）和粘塑性自洽（VPSC）框架，研究了Ti-6AL-4V合金加工过程中晶体织构的演变和不同滑移系统的激活。采用考虑五个滑移族激活和六方密排（HCP）Ti结构孪生的VPSC模型，结合有限元切削模拟模型，模拟了Ti-6AL-4V加工过程中的织构变化。利用OIM研究了Ti-6AL-4V在切屑和机加工表面的晶体学织构演变。Ti-6AL-4V的两种初始织构产生了相同的端部织构，即强烈的C纤维织构。最后，修改Voce硬化参数，以控制滑移模式的激活以及孪晶，并校准织构和力学性能的VPSC模拟结果。研究发现，在Ti-6AL-4V的加工过程中，棱柱状、基底状、棱锥状和二阶棱锥状滑移系统的结合导致了c剪切织构的产生。无论初始织构和加工参数如何，2阶滑移系统的激活对c剪切织构的形成有很大的贡献。结果表明，在加工Ti-6AL-4V时，滑移系统的激活及其相关活动取决于剪切变形。这一发现对于控制Ti-6AL-4V变形过程中的织构变化具有重要意义。（C） 2020爱思唯尔B.V.版权所有。

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