基于电场作用下的40Cr/40Cr钢的超塑性固态焊接接头性能及组织研究  

Research on Super-plastic Solid-state Welding of 40Cr/40Cr Steel Based on Electric Field

作　　者：张青[1] 丁世伟 孙凯伟[3,4] 张柯柯[3,4] 吴公一 于华[3,4] 邱然锋[3,4] 

机构地区：[1]安徽职业技术学院,安徽合肥230011 [2]中信重工机械股份有限公司,河南洛阳47100 [3]河南科技大学材料科学与工程学院,河南洛阳471003 [4]有色金属共性技术河南省协同创新中心,河南洛阳471003

出　　处：《热加工工艺》2015年第9期51-55,共5页Hot Working Technology

基　　金：国家自然科学基金(50774029);国家自然科学基金(U1294520);河南省杰出青年科学基金(074100510011);河南省基础与前沿技术研究项目(122300410202);教育部留学回国人员科研启动基金资助项目;河南省科技攻关项目(112102210176);河南省高校科技创新团队计划支持练计划(13TETSTHN003)

摘　　要：基于对超细化预处理的40Cr/40Cr电场作用下超塑性焊接可行性的分析,在非真空、无保护气氛下,以电场作用下40Cr/40Cr的超塑性焊接工艺为研究对象,探讨其在非真空、无保护气氛下,有、无电场作用下40Cr钢的压缩及40Cr/40Cr的超塑性焊接工艺,根据压缩试验结果选E=0和2 k V/cm进行压接。结果表明:在750℃、应变速率为1.5×10-4s-1、保温时间20 min条件下压缩时,E=2 k V/cm时电场作用效果最明显;并选E=0和2 k V/cm焊接试样拉伸强度分别为636.7和657.8 MPa,通过扫描电镜对压缩、焊接试样及拉伸断口进行微观分析,可以看出加2 k V/cm电场的试样组织更细化,结合更紧密,说明电场是有利于超塑性固态焊接的。Based on the action of super-plastic welding feasibility analysis under electric field of 40Cr/40 Cr after pretreatment of ultrafine, the super-plastic welding process experiment of 40Cr/40 Cr under electric field in a vacuum without protection atmosphere was conducted. The compression of 40 Cr and super-plastic welding procedure test of 40 Cr/40 Cr under electric field or not in a vacuum without protection atmosphere were explored. E=0 and 2 kv/cm was selected to crimp according to the experimental results of compression. The results show that,when the electric field strength E is 2 k V/cm,40 Cr steel presents a better compression super plasticity under the condition of 750℃ and strain rate of 1.5×10-4/s; the tensile strength of welded sample is selected under 0 kv/cm and 2 kv/cm as 636.7 MPa and 657.8 MPa,by the microscopic analysis of compression, welding specimen and tensile fracture via SEM. The microstructure of 2kv/cm sample is more refined,the combination is tighter,it shows that the electric field is beneficial to super-plastic solid-state welding.

关 键 词：40CR钢 电场 超塑性 固态焊接 组织及性能 

分 类 号：TG456.9[金属学及工艺—焊接]