TC4钛合金电致塑性V型弯曲性能的实验研究

Experimental study on electroplastic V-bending properties of TC4 titanium alloys

针对TC4钛合金常温下冲压成形性能差的问题,通过电塑性拉伸、电塑性V型弯曲实验,研究了脉冲电流对TC4钛合金V型弯曲性能的影响规律。电塑性拉伸实验表明,电流可有效提高TC4钛合金的延伸率,降低流动应力,当有效电流密度从9.03A·mm-2增加到11.84A·mm-2时,延伸率从20.1%提高到69.7%。电塑性V型弯曲实验表明,电流可有效提高TC4钛合金的弯曲成形性能,降低回弹角和弯曲成形力,当有效电流密度从14A·mm-2增加到38.67A·mm-2时,回弹角减小47.5%。

TC4 titanium alloys are restricted in forming the complex parts due to its limited plasticity.Electroplastic tension and electroplastic V-bending experiments were performed to study the influence of pulse current on the bending properties of TC4 titanium alloys.The results of electroplastic tension show that,with increasing current density,the elongation is obviously improved and the flow stress is significantly reduced.When the current density is increased from 9.03A·mm-2 to 11.84A·mm-2,the elongation is increased from 20.1%to 69.7%.The results of electroplastic V-bending show that pulse current can effectively improve the bending properties.Moreover,the springback is obviously decreased and the bending properties can be improved with increasing current density.When the current density is increased from 14A·mm-2 to 38.67A·mm-2,the springback is reduced by 47.5%.