脉冲电流处理对轧制316L不锈钢的快速强化  

Rapid Strengthening of Rolled 316L Stainless Steel by Electric Pulse Treatment

作　　者：黄桔 廖承志 杨屹[1] 秦义[2] 刘剑[1] 薛令 李强[1] 吴明霞[1] HUANG Ju;LIAO Cheng-zhi;YANG Yi;QIN Yi;LIU Jian;XUE Ling;LI Qiang;WU Ming-xia(School of Mechanical Engineering,Sichuan University,Chengdu 610065,China;Dept.of Design,Manufacturing and Engineering Management,University of Strathclyde,Glasgow G11XJ,UK)

机构地区：[1]四川大学机械工程学院,成都610065 [2]思克莱德大学设计制造及工程管理系,格拉斯哥G11XJ

出　　处：《精密成形工程》2023年第12期134-141,共8页Journal of Netshape Forming Engineering

基　　金：四川省自然科学基金面上项目(2022NSFC0336)。

摘　　要：目的探究不同参数的脉冲电流处理(EPT)对轧制316L不锈钢拉伸性能、显微硬度及微观组织的影响。方法将轧制的316L不锈钢作为原始样,调节流过样品的脉冲电流密度,分别为130、170、190、260、310A/mm2,分析脉冲电流密度与其拉伸性能和显微硬度的关系。结果轧制316L不锈钢的抗拉强度和显微硬度随着脉冲电流密度的增大呈现先增大后减小的趋势,其中当脉冲电流密度为170 A/mm2时达到峰值,抗拉强度由1485MPa提升到1625MPa,同时显微硬度也由431HV增大到473HV。通过电子背散射衍射分析微观组织可知,与原始样相比,经过脉冲电流处理的样品晶粒尺寸明显减小,马氏体含量明显增多,脉冲电流处理可以促使微观组织快速均匀化。结论脉冲电流处理可以在短时间内实现轧制316L不锈钢组织的均匀化调控,有效改善轧制316L不锈钢的微观组织,减少轧钢形变织构,促使参与的奥氏体转变为马氏体,使微观组织趋于稳定,同时还可以使轧制316L不锈钢晶粒快速细化,达到细晶强化的效果,有效提高整体抗拉强度和显微硬度。The work aims to explore the effect of electric pulse treatment(EPT)with different parameters on the tensile properties,microhardness,and microstructure of rolled 316L stainless steel.The rolled 316L stainless steel was used as the original sample,and the pulse current density flowing through the sample was adjusted.Then,the sample was treated with cur-rent of 130,170,190,260,310 A/mm2,respectively and the relationship between the pulse current density and the tensile prop-erties and microhardness of the sample was analyzed.The tensile strength and microhardness of rolled 316L stainless steel showed an increasing and then decreasing trend with the increase of pulse current density,in which the peak value was reached when the pulse current density was 170 A/mm2,and the tensile strength increased from 1485 MPa to 1625 MPa,and micro-hardness increased from 431HV to 473HV.The microstructure of the samples was analyzed by electron backscattering diffrac-tion,which showed that the grain size of the sample after electric pulse treatment decreased significantly compared with that of original sample,and the martensite content increased significantly compared with that of original sample.Electric pulse treat-ment could promote rapid homogenization of microstructure.Electric pulse treatment can achieve the uniform regulation of rolled 316L stainless steel microstructure in a short time,effectively improve the microstructure of rolled 316L stainless steel,reduce the rolled steel deformation weaving,and prompt the participation of austenite into martensite,so that the microstructure tends to stabilize.At the same time,it can make the rolled 316L stainless steel grain rapid refinement to achieve the effect of fine crystal strengthening,effectively improving the overall tensile strength and microhardness.

关 键 词：脉冲电流处理 轧制316L 力学性能 晶粒细化 微观组织 

分 类 号：TG142.71[一般工业技术—材料科学与工程]