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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 analysis of the feasibility of superplastic welding under 40Cr / 40Cr electric field with ultrafine pretreatment, the 40Cr / 40Cr superplastic welding process under electric field was studied under non-vacuum and unprotected atmosphere, Non-vacuum, unprotected atmosphere, with and without electric field 40Cr steel compression and 40Cr / 40Cr superplastic welding process, selected according to the compression test results E = 0 and 2 kV / cm for crimping. The results show that the effect of electric field is most obvious when the strain rate is 1.5 × 10-4s-1 and the holding time is 20 min at 750 ℃, and E = 0 and 2 k V / cm welding specimens tensile strength of 636.7 and 657.8 MPa, respectively, microscopic analysis of the compression, welding specimens and tensile fracture by scanning electron microscopy, we can see that the sample structure plus 2 k V / cm electric field finer, The combination of tighter, indicating that the electric field is conducive to superplastic solid state welding.