Abstract

In this research, conventional extrusion and twist extrusion are combined to propose a new design for single-pass severe plastic deformation technique, which is called Rectangular Vortex Extrusion (RVE). The effects of different parameters like RVE die twist angle as well as friction condition at the die-sample interface were studied using finite element analysis. It was shown that RVE can be successfully performed as a single-pass severe plastic-deformation technique to impose high strain values within the sample. It was revealed that the die geometry has the primary role in imposing torsion on the sample, while friction does not significantly increase the process potential for imposing additional torsion. Meanwhile, friction at the interfaces was found to be effective for increasing the intensity of the velocity gradient within the deformation zone. The results show that increasing the die twist angle and friction condition have a synergetic effect on increasing the accumulated strain values.

Graphic Abstract

中文翻译：

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矩形涡旋挤压严重塑性变形的有限元分析

摘要

在这项研究中，传统的挤压和扭曲挤压相结合，提出了一种用于单程严重塑性变形技术的新设计，称为矩形涡旋挤压（RVE）。使用有限元分析研究了RVE模具扭转角以及模具条件下的摩擦条件等不同参数的影响。结果表明，RVE可作为单次通过的严重塑性变形技术成功地执行，以在样品中施加高应变值。结果表明，模具的几何形状在将扭转施加到样品上时起主要作用，而摩擦不会显着增加施加附加扭转的过程潜力。与此同时，发现在界面处的摩擦对于增加变形区内的速度梯度的强度是有效的。结果表明，增加模具扭转角和摩擦条件对增加累积应变值具有协同作用。

图形摘要