脉冲电流对Al-Cu-Mg合金凝固过程中热裂纹的影响

摘要

通过施加脉冲电流,采用自行设计的低频中压脉冲电源研究了脉冲电流对Al-Cu-Mg合金凝固过程中热裂纹的影响.结果表明,脉冲电流可以有效抑制热裂纹的产生与扩展,在脉冲频率0 ～400 Hz范围内,随着脉冲频率的增加,裂纹体积在下降,在400 Hz的时候,裂纹体积最小达到43.18 mm3,但继续增加脉冲电流频率,裂纹体积在增加.%The effect of pulse current on thermal crack of Al-Cu-Mg alloy during solidification process was studied by self-made low frequency medium voltage pulsed power supply.The results show that pulse current can effectively suppress generation of hot cracks.Size of crack drops with the increase of frequency in the range of pulse frequency of 0 ～400 Hz.The minimum crack volume is 43.18 mm3 at frequency of 400 Hz.But the crack volume rises when the pulse current frequency continues to rise.