电脉冲消除45钢淬火件的残余应力

Eliminating residual stress in 45 steel quenching specimens by electrical pulse

为了研究电脉冲消除金属材料内部残余应力的效果,通过储能电容器放电产生高能电脉冲,对淬火后的45优质碳素结构钢冷轧薄板件进行放电处理,采用小孔法测定电脉冲处理前后试样内残余应力的变化规律.用于电脉冲处理的脉冲电流为指数衰减的振荡波形,同时满足第一个主峰的电流密度为12.2kA/mm2,单次处理的振荡脉冲持续时间小于0.8ms.试验结果表明,经过电脉冲处理后,45钢淬火件中2个主方向残余应力的幅值均出现较为显著的降低,且两者都出现均化效果.

In order to investigate the effect of electrical pulse on eliminating residual stress within metallic material, high-energy electrical pulse was generated by discharging with energy-storage capacitors, and was adopted to treat quenching cold-rolled sheet specimens that were made of 45 high-quality carbon structural steel, and the hole-drilling method was taken to determine the change rule of the residual stress within the specimens before and after electropulse treatment. The pulse current used for electropulse treatment had oscillating waveshape with exponential damping, whose first peak of the current density was 12.2 kA/mm2 and oscillating pulse duration of single treatment was less than 0.8ms. The experimental results show that the amplitude of residual stresses in the two principal directions of 45 steel quenching specimens decrease much more significantly after electropulsing treatment and both of them are homogenized.