脉冲电流处理对36MnVS4钢连杆力学性能的影响

Effect of pulsed current treatment on mechanical properties of36Mn VS4 steel connecting rod

采用MTS电液伺服试验机、QBG-200高频疲劳试验机、HV-1000B显微硬度计测试了脉冲电流处理前后36MnVS4非调质钢的力学性能，通过金相显微镜、扫描电子显微镜观察了处理前后试样的显微组织。结果表明：脉冲电流处理后36MnVS4钢中铁素体由粗大片条网状变成细小独立、均匀分布条状，且含量明显变少；与未处理试样相比，抗拉强度、断裂韧度、显微硬度分别提高了7．8％、6．6％和6．9％，而伸长率、断面收缩率有所降低。

The mechanical properties of non-quenched and tempered steel 36MnVS4 before and after pulse current processing were tested by using MTS electro-hydraulic servo testing machine, QBG-200 high-frequency fatigue testing machine and HV-1000B microhardness tester. The microstructures of the samples before and after the treatment were observed by OM and SEM. The results show that the ferrite in the 36MnVS4 steel changes from coarse lamellar network to fine independent and uniform strip, and the content of the ferrite decreases obviously. Compared with the untreated sample, the tensile strength, fracture toughness, and microhardness increase by 7.8% , 6.6% and 6.9%, respectively, while the elongation and reduction of area reduce.