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采用Cu作中间层对工业纯钛和1Cr18Ni9不锈钢进行了脉冲加压扩散连接。在连接温度850℃,脉冲压力8~20 MPa工艺条件下,在120~180 s时间内即实现了钛与不锈钢的有效连接,与传统扩散焊相比连接时间大幅缩短。在Ti/Cu界面生成了大量的Ti-Cu金属间化合物;而在Cu/不锈钢界面只生成了Cu在奥氏体不锈钢中的固溶体,Cu中间层有效地阻隔了Ti与不锈钢之间的扩散和反应。在连接时间为120 s时得到了最大的连接强度346 MPa。在拉伸载荷下,接头沿Ti/Cu界面发生脆性断裂。脉冲加压扩散连接能在一定程度上降低界面金属间化合物对接头性能的有害作用,提高接头强度,但不能完全消除界面金属间化合物对接头的不利影响。
The use of Cu as the intermediate layer of industrial pure titanium and 1Cr18Ni9 stainless steel pulse pressure diffusion bonding. The effective connection of titanium and stainless steel was achieved within 120 ~ 180 s under the conditions of 850 ℃ temperature and 8 ~ 20 MPa pulse pressure. Compared with traditional diffusion welding, the connection time was shortened significantly. A large amount of Ti-Cu intermetallic compounds were formed at the Ti / Cu interface. However, only Cu solid solution was formed in the austenitic stainless steel at the Cu / stainless steel interface. The Cu interlayers effectively blocked the diffusion between Ti and stainless steel and reaction. When the connection time is 120 s, the maximum connection strength is 346 MPa. Under tensile load, the joint brittle fracture along the Ti / Cu interface. Pulsed pressurized diffusion bonding can reduce the harmful effect of interfacial intermetallic compounds on the joint performance to a certain extent and improve the joint strength, but can not completely eliminate the adverse effect of interface intermetallic compounds on the joint.