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基于微细晶超塑性扩散连接方法,对TC4钛合金与1Cr18Ni9Ti不锈钢成功实现了直接扩散连接,系统分析了接头性能、界面微观结构及超塑性扩散连接机理。结果发现:TC4钛合金与1Cr18Ni9Ti奥氏体不锈钢直接超塑性扩散连接时,较佳连接工艺规范为:温度T=760～820℃,压力p=6～9MPa,时间t=20～40min;接头剪切强度τ=125.3～148.7MPa。与一般直接扩散连接相比,连接温度降低了约100℃,接头的剪切强度提高了1倍以上,且连接试样无明显变形。细化热处理TC4钛合金与1Cr18Ni9Ti不锈钢超塑性扩散连接时,其接头的形成过程大致可分为3个阶段:形成紧密接触阶段、接触表面激活阶段及靠近活化中心的界面冶金结合区形成阶段。
Based on the fine-grained superplastic diffusion bonding method, direct diffusion bonding was successfully achieved on TC4 titanium alloy and 1Cr18Ni9Ti stainless steel. The joint properties, interface microstructure and superplastic diffusion bonding mechanism were systematically analyzed. The results show that when the direct superplastic diffusion bonding between TC4 titanium alloy and 1Cr18Ni9Ti austenitic stainless steel is performed, the connection specification is as follows: temperature T = 760 ~ 820 ℃, pressure p = 6 ~ 9MPa, time t = 20 ~ 40min; Cutting strength τ = 125.3 ~ 148.7MPa. Compared with the general direct diffusion connection, the connection temperature is reduced by about 100 ℃, the shear strength of the joint is increased by more than 1 times, and the connection specimen has no obvious deformation. When the heat treatment TC4 titanium alloy and 1Cr18Ni9Ti stainless steel superplastic diffusion connection, the joint formation process can be divided into three stages: the formation of close contact stage, the contact surface activation stage and the interface near the activation center metallurgical junction formation stage.