脉冲电流对T2纯铜/304不锈钢复合薄带变形性能与组织的影响  

Effect of pulse current on deformation properties and microstructure of T2 pure copper/304 stainless steel composite thin strips

作　　者：张浩然 丁青山[1,2] 刘晓 任忠凯 王涛[1,2] ZHANG Hao-ran;DING Qing-shan;LIU Xiao;REN Zhong-kai;WANG Tao(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;National Key Laboratory of Metal Forming Technology and Heavy Equipment,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,山西太原030024 [2]太原理工大学金属成形技术与重型装备全国重点实验室,山西太原030024

出　　处：《塑性工程学报》2023年第6期194-206,共13页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(51974196);国家自然科学基金重大项目(U22A20188);国家重点研发计划(2018YFA0707300);中国博士后科学基金资助项目(201903D421047);山西省自然科学基金资助项目(20210302124426)。

摘　　要：为了研究脉冲电流大小和频率与T2纯铜/304不锈钢复合薄带的强度和延展性等力学性能之间的关系,通过冷轧结合450和970℃两种温度的退火工艺制备了软硬两种状态的复合薄带,并分别对其进行了脉冲电流辅助单向拉伸试验。通过微观组织与断口形貌观察分析了复合薄带变形机制与脉冲电流的作用机理。结果表明,脉冲电流会引起复合薄带的软化,同时导致伸长率降低。当频率不变时,随着电流的增大,纯铜/不锈钢复合薄带的软化与伸长率降低的现象愈加显著;但电流一定时,改变频率对软化效果影响并不明显。脉冲电流对复合薄带性能的影响源于其对钢侧变形协调机制的调控,通过抑制奥氏体的孪生与相变过程降低了复合薄带整体变形抗力。拥有奥氏体再结晶组织的软态复合薄带表现出的软化现象比拥有轧制变形组织的硬态复合薄带更加显著。To study the relationship between the magnitude and frequency of pulse current and the strength and ductility of T2 pure copper/304 stainless steel composite thin strips,the composite thin strips in two states of soft and hard were prepared by cold rolling combined with annealing at 450 and 970℃,respectively.The pulse current⁃assisted uniaxial tensile tests were carried out.The deformation mechanism of the composite thin strips and the action mechanism of pulse current were analyzed through the microstructure and fracture morphologies ob⁃servation.The results show that the pulse current can cause the softening of the composite thin strips,and lead to the decrease of the elonga⁃tion at the same time.When the frequency is constant,the softening and elongation of copper/stainless steel composite thin strips decrease become more obvious as the current increases;but when the current is constant,changing the frequency has little influence on the softening effect.The effect of pulse current on the properties of composite thin strip stems from its regulation on the deformation coordination mecha⁃nism of the steel side,which reduces the overall deformation resistance of the composite thin strips by inhibiting the twinning and phase transformation process of the austenite.The soft⁃state composite thin strips with austenite recrystallized microstructure shows more significant softening than hard⁃state composite thin strips with rolling deformation.

关 键 词：复合薄带 脉冲电流 拉伸性能 不锈钢 铜 

分 类 号：TB31[一般工业技术—材料科学与工程] TG35[金属学及工艺—金属压力加工]