脉冲电流对10CrNiCu钢的强化作用

Strengthening of 10CrNiCu steel treated by electropulsing

通过光学显微镜、扫描电子显微镜(SEM)、拉伸试验机、维氏硬度计等研究脉冲电流处理后10CrNiCu钢显微组织及力学性能的变化,并与传统淬火处理进行对比。结果表明,经脉冲电流处理的10CrNiCu钢,显微组织得到明显细化,并且多相混合,具有良好的综合力学性能。随着脉冲电流密度的增加或作用时间的延长,10CrNiCu钢的显微组织由铁素体+珠光体转变为贝氏体+马氏体的混合组织,力学性能也随之提高。与传统淬火处理相比,脉冲电流处理后10CrNiCu钢具有更高的强度和硬度,且伸长率未降低。

Microstructure and mechanical properties of 10CrNiCu steel treated by electropulsing were investigated by using optical microscope,SEM,tensile testing machine and Vickers hardness tester,and compared with conventional quenching. The results show that after treated by electropulsing,microstructure of 10CrNiCu steel is refined obviously with multi-phase,and mechanical properties are improved significantly. Microstructure transforms from（ ferrite ＋ pearlite） into（ bainite ＋ martensite） with increasing of pulse current intensity or duration,furthermore,the mechanical properties of the steel are improved correspondingly. Compared with conventional quenching,10CrNiCu steel after electropulsing treatment has a higher hardness and tensile strength, and the elongation is not decreased.