脉冲电流处理与回火对碳钢零件残余应力的调控

为了优化残余应力调控工艺,研究了脉冲电流处理与回火处理对45碳钢零件淬火残余应力的影响,产生脉冲电流的电压为2120 V,电容为400 μF。结果表明:脉冲电流处理、600 ℃回火、200 ℃回火对淬火残余应力的降低率分别为50%、80%、40%左右,有效时间分别为30、20、120 min;脉冲电流处理和200 ℃回火后零件保持较高硬度,约为51 HRC,显微组织保留原始淬火马氏体组织形貌;600 ℃回火后零件硬度降低到23 HRC,显微组织发生了较大变化。

Regulation of residual stress of carbon steel parts by electropulsing treatment and tempering

To optimize the residual stress controlled process, the effects of electropulsing treatment and tempering on quenched residual stress of the 45 carbon steel were studied. The voltage to generate electro pulse was 2120 V, and the capacitance was 400 μF. The results show that the release rates of quenched residual stress by electropulsing treatment, 600 ℃ tempering and 200 ℃ tempering are about 50%, 80% and 40% respectively, and the effective time is 30, 20 and 120 min respectively. Furthermore, the parts after electropulsing treatment and 200 ℃ tempering have high hardness about 51 HRC and the quenched martensite microstructure is remained, but the parts after 600 ℃ tempering have low hardness, 23 HRC and the microstructure changes greatly.