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Deformation process of metal powder in compressive torsion forming

机译：压扭成形中金属粉末的变形过程

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摘要

To clarify the consolidation process of metal powder in compressive torsion forming, which simultaneously utilizes hydrostatic pressure and shear stress, the distributions of shear strain in the formed powder were measured and discussed in termsof the distributions of microstructure, tensile strength and fracture surface. Cylindrical specimens of 25 mm diameter and 30 mm height composed of a combination of different powders were formed using various torsion cycles at 773K to visualize thedeformation during the forming. A relatively small shear strain was desirable for compacting and consolidating the powder. The small shear strain was propagated and the partially consolidated area spread gradually from the twisted side to the rigid sidewith increase in the number of torsion cycles. The powder near the twisted side was severely stirred by gigantic shear strain, but this strain did not spread very far.
机译：为了阐明金属粉末在压缩扭力成形中同时利用静水压力和剪切应力的固结过程，测量了成形粉末中的剪切应变分布，并从微观结构，抗拉强度和断裂面的角度进行了讨论。由各种粉末组成的直径为25 mm，高度为30 mm的圆柱试样在773K上使用各种扭转循环形成，以观察成形过程中的变形。为了压实和固结粉末，需要较小的剪切应变。随着扭转循环次数的增加，小剪切应变得以传播，部分固结区域逐渐从扭转侧向刚性侧扩展。巨大的剪切应变严重地扭曲了扭曲面附近的粉末，但该应变并没有扩散到很远。

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