【摘要】 基于外加电场可改善材料的超塑性和钢与铜超塑性固态压接的可行性,将材料电致超塑性效应与固态压接技术有机结合以开发新的电致超塑性固态压接技术,具有重要的使用价值和工业应用前景.结果表明,在非真空、无保护气氛下,预压应力为56.6 MPa,初始应变速率为1.5×10-4/s、压接温度为710~800℃、压接时间为0~8min、电场强度为0~3 k V/cm时,40Cr/QCr0.5压接接头的抗拉强度达到甚至超过QCr0.5母材强度,QCr0.5侧接头胀大率不超过4%.当电场强度为3 k V/cm时,40Cr与QCr0.5的压接接头形成了良好的冶金结合.更多还原

【Abstract】 Based on an external electric field improving superplasticity of materials and the feasibility of isothermal superplastic solid state pressure welding of steel and copper alloy,a new technology of electro-superplasticity solid-state pressure welding is developed,which has an important value and prospects for industrial applications. The results show that 40 Cr and QCr0. 5 can be welded with the application of an external electrical field 0 ~ 3 kV / cm under the condition of non-vacuum,nonshield gas,welding prepressure of 56. 6 MPa,initial strain rate of 1. 5 × 10-4/ s,pressure welding temperature of 710 ~ 800 ℃and pressure welding time of 0 ~ 8 min. The tensile strength of the joint is up to or exceed that of QCr0. 5 base metal,and the expanded rate of QCr0. 5 does not exceed 4%,and welding joint of 40 Cr and QCr0. 5 has formed a good metallurgical bonding when the electric field intensity is 3 kV / cm.更多还原