Abstract Electropulsing assisted incremental forming as an advanced technology could enhance the formability of hard-to-deform metal. However, the mechanism behind this improvement has not been clearly investigated. In this work, the texture development, fracture characteristic, strain variation and microstructure evolution were analyzed to study the deformation behaviors of Ti-6Al-4V alloy during electropulsing assisted incremental forming. The effect of orthotropic basal texture evolution on the crack propagation behavior presented that the electropulsing decreased the strong texture strength along the transverse direction, delaying the crack propagation along the rolling direction. Moreover, electropulsing caused the (0 0 0 1) base texture weakening, and the weakening of anisotropy behaviors led to the formability enhancement. The maximum deformation height of 21.7 mm and the forming angle of 66.5° were obtained. The deformation height was increased by 417.9% compared to conventional ambient incremental forming. The strain analysis results showed that the thickness strain difference along the rolling and transverse directions was reduced under the electropulsing. It was consistent with the phenomenon that the crack propagation direction along the rolling direction at room temperature was changed to the rolling and transverse directions under electropulsing. Another important observation on research was that anisotropic microstructure along different directions tended to be uniform due to the occurrence of dynamic recrystallization under electropulsing.

中文翻译：

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Ti-6Al-4V薄板电脉冲辅助渐进成形的成形性及变形机理

摘要 电脉冲辅助渐进成形作为一种先进技术，可以提高难变形金属的成形性能。然而，这种改进背后的机制尚未得到明确研究。本文通过分析Ti-6Al-4V合金在电脉冲辅助渐进成形过程中的织构发展、断裂特征、应变变化和微观结构演变，研究其变形行为。正交各向异性基底织构演化对裂纹扩展行为的影响表现为电脉冲降低了横向强织构强度，延迟了裂纹沿轧制方向的扩展。此外，电脉冲导致（0 0 0 1）基底织构减弱，各向异性行为减弱导致可成形性增强。获得的最大变形高度为 21.7 mm，成型角度为 66.5°。与传统的环境渐进成形相比，变形高度增加了 417.9%。应变分析结果表明，在电脉冲作用下，沿轧制和横向的厚度应变差减小。这与室温下裂纹扩展方向沿轧制方向转变为电脉冲作用下的轧制和横向的现象是一致的。研究的另一个重要观察结果是，由于在电脉冲下发生动态再结晶，沿不同方向的各向异性组织趋于均匀。9% 与传统的常温渐进成型相比。应变分析结果表明，在电脉冲作用下，沿轧制和横向的厚度应变差减小。这与室温下裂纹扩展方向沿轧制方向转变为电脉冲作用下的轧制和横向的现象是一致的。研究的另一个重要观察结果是，由于在电脉冲下发生动态再结晶，沿不同方向的各向异性组织趋于均匀。9% 与传统的常温渐进成型相比。应变分析结果表明，在电脉冲作用下，沿轧制和横向的厚度应变差减小。这与室温下裂纹扩展方向沿轧制方向转变为电脉冲作用下的轧制和横向的现象是一致的。研究的另一个重要观察结果是，由于在电脉冲下发生动态再结晶，沿不同方向的各向异性组织趋于均匀。这与室温下裂纹扩展方向沿轧制方向转变为电脉冲作用下的轧制和横向的现象是一致的。研究的另一个重要观察结果是，由于在电脉冲下发生动态再结晶，沿不同方向的各向异性组织趋于均匀。这与室温下裂纹扩展方向沿轧制方向转变为电脉冲作用下的轧制和横向的现象是一致的。研究的另一个重要观察结果是，由于在电脉冲下发生动态再结晶，沿不同方向的各向异性组织趋于均匀。