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经冷拔变形的金属线材在抗拉强度得到大幅提高的同时,伸长率明显下降,需要采用后处理方法来实现软化。采用不同频率的高强脉冲电流对两种冷拔金属线材(镀铜焊丝和55CrSi弹簧钢)进行处理,并通过单轴拉伸和金相分析研究电流对其性能和组织的影响。与处理前的样品相比,在较低的脉冲频率作用下,高强度镀铜焊丝和55CrSi弹簧钢的显微组织均没有发生明显变化,而抗拉强度分别下降17%和16%,伸长率分别提高36%和195%;提高脉冲频率后,在二者的显微组织中开始引入细小均匀的等轴晶,而抗拉强度分别下降40%和26%,伸长率则分别提高793%和384%。与退火热处理相比,高强脉冲电流可作为一种高效快速的冷拔金属线材后处理方法。
The cold-drawn deformation of the metal wire in the tensile strength has been greatly improved at the same time, the elongation decreased significantly, the need to use post-processing methods to achieve softening. Two types of cold-drawn metal wires (copper-plated wires and 55CrSi spring steel) were treated with high-frequency pulsed current with different frequencies. The effects of current on their properties and microstructure were studied by uniaxial tension and metallographic analysis. Compared with the pre-treatment samples, the microstructure of high-strength copper wire and 55CrSi spring steel did not change obviously at lower pulse frequency, but the tensile strength decreased by 17% and 16% The rate of increase was 36% and 195% respectively; when the pulse frequency was increased, fine equiaxed grains began to be introduced into the microstructure of the two, while the tensile strength decreased by 40% and 26% respectively, while the elongation increased by 793% % And 384%. Compared with the annealing heat treatment, high-intensity pulsed current can be used as a fast and efficient method for post-treatment of cold drawn metal wire.