Research On Diffusion Bonding Of TC4 Titanium Alloy And 1Cr18Ni9Ti Stainless Steel

Studying the conjunction of titanium alloy and stainless steel is significant for reasonably, efficiently and fully using titanium alloy. It also develops a new way to synthesize the good properties of two alloys and improve the applicability of the correlative products.The certain temperature and pressure solid-state diffusion process, ultrasonic concussion solid-state diffusion bonding process and phase transformation super plastic diffusion bonding process of the three different proliferations of bonding technology between TC4 titanium alloy and 1Cr18Ni9Ti stainless steel are investigated in this paper. The parameters of bonding temperature, bonding pressure, bonding times'effect on the quality of joints are determined and found the optimal bonding parameters are T = 880°C, P =10MPa, t =30 min under the certain temperature and pressure solid-state diffusion process; The parameter of the loading times'effect on the quality of joints are determined and found the optimal parameters are T = 880°C, P = 10MPa, t = 30 min, N = 10 under the ultrasonic concussion solid-state diffusion bonding process; The parameter of the maximum temperature cycle T-max's effect on the quality of joints are determined and found the optimal bonding parameters are T-min = 800°C, T-max = 890°C, P = 10MPa, N = 30 under the phase transformation super plastic diffusion bonding process.The methods to improve the quality of bonding are found through the discussion of the interface diffusion bonding process. The cycle phase transformation and ultrasonic pressing can really play a role in promoting diffusion bonding by comparing the best joints of the three different bonding processes'phase photographs, line scanning photos and micro hardness distribution maps.